[ecf6b46] | 1 | // |
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| 2 | // Cforall Version 1.0.0 Copyright (C) 2020 University of Waterloo |
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| 3 | // |
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| 4 | // The contents of this file are covered under the licence agreement in the |
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| 5 | // file "LICENCE" distributed with Cforall. |
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| 6 | // |
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| 7 | // io.cfa -- |
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| 8 | // |
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| 9 | // Author : Thierry Delisle |
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| 10 | // Created On : Thu Apr 23 17:31:00 2020 |
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| 11 | // Last Modified By : |
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| 12 | // Last Modified On : |
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| 13 | // Update Count : |
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| 14 | // |
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| 15 | |
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[4069faad] | 16 | // #define __CFA_DEBUG_PRINT_IO__ |
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[0a805f2] | 17 | // #define __CFA_DEBUG_PRINT_IO_CORE__ |
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[4069faad] | 18 | |
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[92976d9] | 19 | #include "kernel.hfa" |
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[5c581cc] | 20 | #include "bitmanip.hfa" |
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[92976d9] | 21 | |
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| 22 | #if !defined(HAVE_LINUX_IO_URING_H) |
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[dd4e2d7] | 23 | void __kernel_io_startup( cluster &, unsigned, bool ) { |
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[92976d9] | 24 | // Nothing to do without io_uring |
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| 25 | } |
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| 26 | |
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[3f7d0b4] | 27 | void __kernel_io_finish_start( cluster & ) { |
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[f6660520] | 28 | // Nothing to do without io_uring |
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| 29 | } |
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| 30 | |
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[3f7d0b4] | 31 | void __kernel_io_prepare_stop( cluster & ) { |
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[f6660520] | 32 | // Nothing to do without io_uring |
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| 33 | } |
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| 34 | |
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[3f7d0b4] | 35 | void __kernel_io_shutdown( cluster &, bool ) { |
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[92976d9] | 36 | // Nothing to do without io_uring |
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| 37 | } |
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| 38 | |
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| 39 | #else |
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| 40 | extern "C" { |
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| 41 | #define _GNU_SOURCE /* See feature_test_macros(7) */ |
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| 42 | #include <errno.h> |
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| 43 | #include <stdint.h> |
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| 44 | #include <string.h> |
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| 45 | #include <unistd.h> |
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| 46 | #include <sys/mman.h> |
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| 47 | #include <sys/syscall.h> |
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| 48 | |
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| 49 | #include <linux/io_uring.h> |
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| 50 | } |
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| 51 | |
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| 52 | #include "bits/signal.hfa" |
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| 53 | #include "kernel_private.hfa" |
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| 54 | #include "thread.hfa" |
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| 55 | |
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| 56 | uint32_t entries_per_cluster() { |
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| 57 | return 256; |
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| 58 | } |
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| 59 | |
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[f6660520] | 60 | static void * __io_poller_slow( void * arg ); |
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| 61 | |
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| 62 | // Weirdly, some systems that do support io_uring don't actually define these |
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| 63 | #ifdef __alpha__ |
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| 64 | /* |
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| 65 | * alpha is the only exception, all other architectures |
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| 66 | * have common numbers for new system calls. |
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| 67 | */ |
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| 68 | #ifndef __NR_io_uring_setup |
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| 69 | #define __NR_io_uring_setup 535 |
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| 70 | #endif |
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| 71 | #ifndef __NR_io_uring_enter |
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| 72 | #define __NR_io_uring_enter 536 |
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| 73 | #endif |
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| 74 | #ifndef __NR_io_uring_register |
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| 75 | #define __NR_io_uring_register 537 |
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| 76 | #endif |
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| 77 | #else /* !__alpha__ */ |
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| 78 | #ifndef __NR_io_uring_setup |
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| 79 | #define __NR_io_uring_setup 425 |
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| 80 | #endif |
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| 81 | #ifndef __NR_io_uring_enter |
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| 82 | #define __NR_io_uring_enter 426 |
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| 83 | #endif |
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| 84 | #ifndef __NR_io_uring_register |
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| 85 | #define __NR_io_uring_register 427 |
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| 86 | #endif |
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| 87 | #endif |
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| 88 | |
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[61dd73d] | 89 | // Fast poller user-thread |
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| 90 | // Not using the "thread" keyword because we want to control |
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| 91 | // more carefully when to start/stop it |
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| 92 | struct __io_poller_fast { |
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| 93 | struct __io_data * ring; |
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| 94 | $thread thrd; |
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| 95 | }; |
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| 96 | |
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| 97 | void ?{}( __io_poller_fast & this, struct cluster & cltr ) { |
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| 98 | this.ring = cltr.io; |
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| 99 | (this.thrd){ "Fast I/O Poller", cltr }; |
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| 100 | } |
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| 101 | void ^?{}( __io_poller_fast & mutex this ); |
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| 102 | void main( __io_poller_fast & this ); |
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| 103 | static inline $thread * get_thread( __io_poller_fast & this ) { return &this.thrd; } |
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| 104 | void ^?{}( __io_poller_fast & mutex this ) {} |
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| 105 | |
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| 106 | struct __submition_data { |
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| 107 | // Head and tail of the ring (associated with array) |
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| 108 | volatile uint32_t * head; |
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| 109 | volatile uint32_t * tail; |
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| 110 | |
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| 111 | // The actual kernel ring which uses head/tail |
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| 112 | // indexes into the sqes arrays |
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| 113 | uint32_t * array; |
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| 114 | |
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| 115 | // number of entries and mask to go with it |
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| 116 | const uint32_t * num; |
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| 117 | const uint32_t * mask; |
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| 118 | |
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| 119 | // Submission flags (Not sure what for) |
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| 120 | uint32_t * flags; |
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| 121 | |
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| 122 | // number of sqes not submitted (whatever that means) |
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| 123 | uint32_t * dropped; |
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| 124 | |
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| 125 | // Like head/tail but not seen by the kernel |
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| 126 | volatile uint32_t alloc; |
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[5dadc9b] | 127 | volatile uint32_t * ready; |
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| 128 | uint32_t ready_cnt; |
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[61dd73d] | 129 | |
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| 130 | __spinlock_t lock; |
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| 131 | |
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| 132 | // A buffer of sqes (not the actual ring) |
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| 133 | struct io_uring_sqe * sqes; |
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| 134 | |
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| 135 | // The location and size of the mmaped area |
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| 136 | void * ring_ptr; |
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| 137 | size_t ring_sz; |
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| 138 | |
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| 139 | // Statistics |
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| 140 | #if !defined(__CFA_NO_STATISTICS__) |
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| 141 | struct { |
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| 142 | struct { |
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[05cfa4d] | 143 | volatile unsigned long long int val; |
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| 144 | volatile unsigned long long int cnt; |
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| 145 | volatile unsigned long long int block; |
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[61dd73d] | 146 | } submit_avg; |
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[5dadc9b] | 147 | struct { |
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| 148 | volatile unsigned long long int val; |
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| 149 | volatile unsigned long long int cnt; |
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| 150 | volatile unsigned long long int block; |
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| 151 | } look_avg; |
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[61dd73d] | 152 | } stats; |
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| 153 | #endif |
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| 154 | }; |
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| 155 | |
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| 156 | struct __completion_data { |
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| 157 | // Head and tail of the ring |
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| 158 | volatile uint32_t * head; |
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| 159 | volatile uint32_t * tail; |
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| 160 | |
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| 161 | // number of entries and mask to go with it |
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| 162 | const uint32_t * mask; |
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| 163 | const uint32_t * num; |
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| 164 | |
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| 165 | // number of cqes not submitted (whatever that means) |
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| 166 | uint32_t * overflow; |
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| 167 | |
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| 168 | // the kernel ring |
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| 169 | struct io_uring_cqe * cqes; |
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| 170 | |
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| 171 | // The location and size of the mmaped area |
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| 172 | void * ring_ptr; |
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| 173 | size_t ring_sz; |
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| 174 | |
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| 175 | // Statistics |
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| 176 | #if !defined(__CFA_NO_STATISTICS__) |
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| 177 | struct { |
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| 178 | struct { |
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| 179 | unsigned long long int val; |
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| 180 | unsigned long long int slow_cnt; |
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| 181 | unsigned long long int fast_cnt; |
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| 182 | } completed_avg; |
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| 183 | } stats; |
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| 184 | #endif |
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| 185 | }; |
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| 186 | |
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| 187 | struct __io_data { |
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| 188 | struct __submition_data submit_q; |
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| 189 | struct __completion_data completion_q; |
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[b6f2b213] | 190 | uint32_t ring_flags; |
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| 191 | int cltr_flags; |
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[61dd73d] | 192 | int fd; |
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| 193 | semaphore submit; |
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| 194 | volatile bool done; |
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| 195 | struct { |
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| 196 | struct { |
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| 197 | void * stack; |
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| 198 | pthread_t kthrd; |
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[5c581cc] | 199 | volatile bool blocked; |
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[61dd73d] | 200 | } slow; |
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| 201 | __io_poller_fast fast; |
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| 202 | __bin_sem_t sem; |
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| 203 | } poller; |
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| 204 | }; |
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[185efe6] | 205 | |
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[92976d9] | 206 | //============================================================================================= |
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| 207 | // I/O Startup / Shutdown logic |
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| 208 | //============================================================================================= |
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[dd4e2d7] | 209 | void __kernel_io_startup( cluster & this, unsigned io_flags, bool main_cluster ) { |
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[61dd73d] | 210 | this.io = malloc(); |
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| 211 | |
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[92976d9] | 212 | // Step 1 : call to setup |
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| 213 | struct io_uring_params params; |
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| 214 | memset(¶ms, 0, sizeof(params)); |
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| 215 | |
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[2d8f7b0] | 216 | uint32_t nentries = entries_per_cluster(); |
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| 217 | |
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| 218 | int fd = syscall(__NR_io_uring_setup, nentries, ¶ms ); |
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[92976d9] | 219 | if(fd < 0) { |
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| 220 | abort("KERNEL ERROR: IO_URING SETUP - %s\n", strerror(errno)); |
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| 221 | } |
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| 222 | |
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| 223 | // Step 2 : mmap result |
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[61dd73d] | 224 | memset( this.io, 0, sizeof(struct __io_data) ); |
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| 225 | struct __submition_data & sq = this.io->submit_q; |
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| 226 | struct __completion_data & cq = this.io->completion_q; |
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[92976d9] | 227 | |
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| 228 | // calculate the right ring size |
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[2d8f7b0] | 229 | sq.ring_sz = params.sq_off.array + (params.sq_entries * sizeof(unsigned) ); |
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| 230 | cq.ring_sz = params.cq_off.cqes + (params.cq_entries * sizeof(struct io_uring_cqe)); |
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[92976d9] | 231 | |
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| 232 | // Requires features |
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[d384787] | 233 | #if defined(IORING_FEAT_SINGLE_MMAP) |
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| 234 | // adjust the size according to the parameters |
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| 235 | if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) { |
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| 236 | cq->ring_sz = sq->ring_sz = max(cq->ring_sz, sq->ring_sz); |
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| 237 | } |
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| 238 | #endif |
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[92976d9] | 239 | |
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| 240 | // mmap the Submit Queue into existence |
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[2d8f7b0] | 241 | sq.ring_ptr = mmap(0, sq.ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_SQ_RING); |
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| 242 | if (sq.ring_ptr == (void*)MAP_FAILED) { |
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[92976d9] | 243 | abort("KERNEL ERROR: IO_URING MMAP1 - %s\n", strerror(errno)); |
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| 244 | } |
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| 245 | |
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| 246 | // Requires features |
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[d384787] | 247 | #if defined(IORING_FEAT_SINGLE_MMAP) |
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| 248 | // mmap the Completion Queue into existence (may or may not be needed) |
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| 249 | if ((params.features & IORING_FEAT_SINGLE_MMAP) != 0) { |
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| 250 | cq->ring_ptr = sq->ring_ptr; |
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| 251 | } |
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| 252 | else |
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| 253 | #endif |
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| 254 | { |
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[92976d9] | 255 | // We need multiple call to MMAP |
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[2d8f7b0] | 256 | cq.ring_ptr = mmap(0, cq.ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_CQ_RING); |
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| 257 | if (cq.ring_ptr == (void*)MAP_FAILED) { |
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| 258 | munmap(sq.ring_ptr, sq.ring_sz); |
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[92976d9] | 259 | abort("KERNEL ERROR: IO_URING MMAP2 - %s\n", strerror(errno)); |
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| 260 | } |
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[d384787] | 261 | } |
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[92976d9] | 262 | |
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| 263 | // mmap the submit queue entries |
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| 264 | size_t size = params.sq_entries * sizeof(struct io_uring_sqe); |
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[2d8f7b0] | 265 | sq.sqes = (struct io_uring_sqe *)mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_POPULATE, fd, IORING_OFF_SQES); |
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| 266 | if (sq.sqes == (struct io_uring_sqe *)MAP_FAILED) { |
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| 267 | munmap(sq.ring_ptr, sq.ring_sz); |
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| 268 | if (cq.ring_ptr != sq.ring_ptr) munmap(cq.ring_ptr, cq.ring_sz); |
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[92976d9] | 269 | abort("KERNEL ERROR: IO_URING MMAP3 - %s\n", strerror(errno)); |
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| 270 | } |
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| 271 | |
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| 272 | // Get the pointers from the kernel to fill the structure |
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| 273 | // submit queue |
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[2d8f7b0] | 274 | sq.head = (volatile uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.head); |
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| 275 | sq.tail = (volatile uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.tail); |
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| 276 | sq.mask = ( const uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_mask); |
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| 277 | sq.num = ( const uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.ring_entries); |
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| 278 | sq.flags = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.flags); |
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| 279 | sq.dropped = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.dropped); |
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| 280 | sq.array = ( uint32_t *)(((intptr_t)sq.ring_ptr) + params.sq_off.array); |
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| 281 | sq.alloc = *sq.tail; |
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[5dadc9b] | 282 | |
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| 283 | if( io_flags & CFA_CLUSTER_IO_POLLER_THREAD_SUBMITS ) { |
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[5c581cc] | 284 | /* paranoid */ verify( is_pow2( io_flags >> CFA_CLUSTER_IO_BUFFLEN_OFFSET ) || ((io_flags >> CFA_CLUSTER_IO_BUFFLEN_OFFSET) < 8) ); |
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[dd4e2d7] | 285 | sq.ready_cnt = max(io_flags >> CFA_CLUSTER_IO_BUFFLEN_OFFSET, 8); |
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[0335620] | 286 | sq.ready = alloc_align( 64, sq.ready_cnt ); |
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[5dadc9b] | 287 | for(i; sq.ready_cnt) { |
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| 288 | sq.ready[i] = -1ul32; |
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| 289 | } |
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| 290 | } |
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| 291 | else { |
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| 292 | sq.ready_cnt = 0; |
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| 293 | sq.ready = 0p; |
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| 294 | } |
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[92976d9] | 295 | |
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| 296 | // completion queue |
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[2d8f7b0] | 297 | cq.head = (volatile uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.head); |
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| 298 | cq.tail = (volatile uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.tail); |
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| 299 | cq.mask = ( const uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_mask); |
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| 300 | cq.num = ( const uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.ring_entries); |
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| 301 | cq.overflow = ( uint32_t *)(((intptr_t)cq.ring_ptr) + params.cq_off.overflow); |
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| 302 | cq.cqes = (struct io_uring_cqe *)(((intptr_t)cq.ring_ptr) + params.cq_off.cqes); |
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| 303 | |
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| 304 | // some paranoid checks |
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| 305 | /* paranoid */ verifyf( (*cq.mask) == ((*cq.num) - 1ul32), "IO_URING Expected mask to be %u (%u entries), was %u", (*cq.num) - 1ul32, *cq.num, *cq.mask ); |
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| 306 | /* paranoid */ verifyf( (*cq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *cq.num ); |
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| 307 | /* paranoid */ verifyf( (*cq.head) == 0, "IO_URING Expected head to be 0, got %u", *cq.head ); |
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| 308 | /* paranoid */ verifyf( (*cq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *cq.tail ); |
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| 309 | |
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| 310 | /* paranoid */ verifyf( (*sq.mask) == ((*sq.num) - 1ul32), "IO_URING Expected mask to be %u (%u entries), was %u", (*sq.num) - 1ul32, *sq.num, *sq.mask ); |
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| 311 | /* paranoid */ verifyf( (*sq.num) >= nentries, "IO_URING Expected %u entries, got %u", nentries, *sq.num ); |
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| 312 | /* paranoid */ verifyf( (*sq.head) == 0, "IO_URING Expected head to be 0, got %u", *sq.head ); |
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| 313 | /* paranoid */ verifyf( (*sq.tail) == 0, "IO_URING Expected tail to be 0, got %u", *sq.tail ); |
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[92976d9] | 314 | |
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| 315 | // Update the global ring info |
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[b6f2b213] | 316 | this.io->ring_flags = params.flags; |
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| 317 | this.io->cltr_flags = io_flags; |
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| 318 | this.io->fd = fd; |
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| 319 | this.io->done = false; |
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[61dd73d] | 320 | (this.io->submit){ min(*sq.num, *cq.num) }; |
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[92976d9] | 321 | |
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[d384787] | 322 | // Initialize statistics |
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[038be32] | 323 | #if !defined(__CFA_NO_STATISTICS__) |
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[05cfa4d] | 324 | this.io->submit_q.stats.submit_avg.val = 0; |
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| 325 | this.io->submit_q.stats.submit_avg.cnt = 0; |
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| 326 | this.io->submit_q.stats.submit_avg.block = 0; |
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[5dadc9b] | 327 | this.io->submit_q.stats.look_avg.val = 0; |
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| 328 | this.io->submit_q.stats.look_avg.cnt = 0; |
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| 329 | this.io->submit_q.stats.look_avg.block = 0; |
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[61dd73d] | 330 | this.io->completion_q.stats.completed_avg.val = 0; |
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| 331 | this.io->completion_q.stats.completed_avg.slow_cnt = 0; |
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| 332 | this.io->completion_q.stats.completed_avg.fast_cnt = 0; |
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[038be32] | 333 | #endif |
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[d384787] | 334 | |
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[f6660520] | 335 | if(!main_cluster) { |
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| 336 | __kernel_io_finish_start( this ); |
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| 337 | } |
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| 338 | } |
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| 339 | |
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| 340 | void __kernel_io_finish_start( cluster & this ) { |
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[b6f2b213] | 341 | if( this.io->cltr_flags & CFA_CLUSTER_IO_POLLER_USER_THREAD ) { |
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| 342 | __cfadbg_print_safe(io_core, "Kernel I/O : Creating fast poller for cluter %p\n", &this); |
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| 343 | (this.io->poller.fast){ this }; |
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| 344 | __thrd_start( this.io->poller.fast, main ); |
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| 345 | } |
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[f6660520] | 346 | |
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[92976d9] | 347 | // Create the poller thread |
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[0a805f2] | 348 | __cfadbg_print_safe(io_core, "Kernel I/O : Creating slow poller for cluter %p\n", &this); |
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[5c581cc] | 349 | this.io->poller.slow.blocked = false; |
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[61dd73d] | 350 | this.io->poller.slow.stack = __create_pthread( &this.io->poller.slow.kthrd, __io_poller_slow, &this ); |
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[92976d9] | 351 | } |
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| 352 | |
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[f6660520] | 353 | void __kernel_io_prepare_stop( cluster & this ) { |
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[0a805f2] | 354 | __cfadbg_print_safe(io_core, "Kernel I/O : Stopping pollers for cluster\n", &this); |
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[92976d9] | 355 | // Notify the poller thread of the shutdown |
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[61dd73d] | 356 | __atomic_store_n(&this.io->done, true, __ATOMIC_SEQ_CST); |
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[f6660520] | 357 | |
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| 358 | // Stop the IO Poller |
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[92976d9] | 359 | sigval val = { 1 }; |
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[61dd73d] | 360 | pthread_sigqueue( this.io->poller.slow.kthrd, SIGUSR1, val ); |
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| 361 | post( this.io->poller.sem ); |
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[92976d9] | 362 | |
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| 363 | // Wait for the poller thread to finish |
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[61dd73d] | 364 | pthread_join( this.io->poller.slow.kthrd, 0p ); |
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| 365 | free( this.io->poller.slow.stack ); |
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[f6660520] | 366 | |
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[0a805f2] | 367 | __cfadbg_print_safe(io_core, "Kernel I/O : Slow poller stopped for cluster\n", &this); |
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[4069faad] | 368 | |
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[b6f2b213] | 369 | if( this.io->cltr_flags & CFA_CLUSTER_IO_POLLER_USER_THREAD ) { |
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[05cfa4d] | 370 | with( this.io->poller.fast ) { |
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| 371 | /* paranoid */ verify( this.procs.head == 0p || &this == mainCluster ); |
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| 372 | /* paranoid */ verify( this.idles.head == 0p || &this == mainCluster ); |
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| 373 | |
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| 374 | // We need to adjust the clean-up based on where the thread is |
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[5dadc9b] | 375 | if( thrd.state == Ready || thrd.preempted != __NO_PREEMPTION ) { |
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[05cfa4d] | 376 | |
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| 377 | // This is the tricky case |
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| 378 | // The thread was preempted and now it is on the ready queue |
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| 379 | /* paranoid */ verify( thrd.next == 1p ); // The thread should be the last on the list |
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| 380 | /* paranoid */ verify( this.ready_queue.head == &thrd ); // The thread should be the only thing on the list |
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| 381 | |
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| 382 | // Remove the thread from the ready queue of this cluster |
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| 383 | this.ready_queue.head = 1p; |
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| 384 | thrd.next = 0p; |
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| 385 | |
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| 386 | // Fixup the thread state |
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| 387 | thrd.state = Blocked; |
---|
| 388 | thrd.preempted = __NO_PREEMPTION; |
---|
| 389 | |
---|
| 390 | // Pretend like the thread was blocked all along |
---|
| 391 | } |
---|
| 392 | // !!! This is not an else if !!! |
---|
| 393 | if( thrd.state == Blocked ) { |
---|
[6502a2b] | 394 | |
---|
[05cfa4d] | 395 | // This is the "easy case" |
---|
| 396 | // The thread is parked and can easily be moved to active cluster |
---|
| 397 | verify( thrd.curr_cluster != active_cluster() || thrd.curr_cluster == mainCluster ); |
---|
| 398 | thrd.curr_cluster = active_cluster(); |
---|
[6502a2b] | 399 | |
---|
[f6660520] | 400 | // unpark the fast io_poller |
---|
[05cfa4d] | 401 | unpark( &thrd __cfaabi_dbg_ctx2 ); |
---|
| 402 | } |
---|
| 403 | else { |
---|
| 404 | |
---|
| 405 | // The thread is in a weird state |
---|
| 406 | // I don't know what to do here |
---|
| 407 | abort("Fast poller thread is in unexpected state, cannot clean-up correctly\n"); |
---|
| 408 | } |
---|
| 409 | |
---|
| 410 | } |
---|
[f6660520] | 411 | |
---|
[61dd73d] | 412 | ^(this.io->poller.fast){}; |
---|
[4069faad] | 413 | |
---|
[0a805f2] | 414 | __cfadbg_print_safe(io_core, "Kernel I/O : Fast poller stopped for cluster\n", &this); |
---|
[b6f2b213] | 415 | } |
---|
[f6660520] | 416 | } |
---|
| 417 | |
---|
| 418 | void __kernel_io_shutdown( cluster & this, bool main_cluster ) { |
---|
| 419 | if(!main_cluster) { |
---|
| 420 | __kernel_io_prepare_stop( this ); |
---|
| 421 | } |
---|
[92976d9] | 422 | |
---|
[d384787] | 423 | // print statistics |
---|
[038be32] | 424 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 425 | if(this.print_stats) { |
---|
[61dd73d] | 426 | with(this.io->submit_q.stats, this.io->completion_q.stats) { |
---|
[5dadc9b] | 427 | double lavgv = 0; |
---|
| 428 | double lavgb = 0; |
---|
| 429 | if(look_avg.cnt != 0) { |
---|
| 430 | lavgv = ((double)look_avg.val ) / look_avg.cnt; |
---|
| 431 | lavgb = ((double)look_avg.block) / look_avg.cnt; |
---|
| 432 | } |
---|
| 433 | |
---|
[61dd73d] | 434 | __cfaabi_bits_print_safe( STDERR_FILENO, |
---|
| 435 | "----- I/O uRing Stats -----\n" |
---|
[5dadc9b] | 436 | "- total submit calls : %'15llu\n" |
---|
| 437 | "- avg submit : %'18.2lf\n" |
---|
| 438 | "- pre-submit block %% : %'18.2lf\n" |
---|
| 439 | "- total ready search : %'15llu\n" |
---|
| 440 | "- avg ready search len : %'18.2lf\n" |
---|
| 441 | "- avg ready search block : %'18.2lf\n" |
---|
| 442 | "- total wait calls : %'15llu (%'llu slow, %'llu fast)\n" |
---|
| 443 | "- avg completion/wait : %'18.2lf\n", |
---|
[61dd73d] | 444 | submit_avg.cnt, |
---|
| 445 | ((double)submit_avg.val) / submit_avg.cnt, |
---|
[05cfa4d] | 446 | (100.0 * submit_avg.block) / submit_avg.cnt, |
---|
[5dadc9b] | 447 | look_avg.cnt, |
---|
| 448 | lavgv, |
---|
| 449 | lavgb, |
---|
[61dd73d] | 450 | completed_avg.slow_cnt + completed_avg.fast_cnt, |
---|
| 451 | completed_avg.slow_cnt, completed_avg.fast_cnt, |
---|
| 452 | ((double)completed_avg.val) / (completed_avg.slow_cnt + completed_avg.fast_cnt) |
---|
| 453 | ); |
---|
| 454 | } |
---|
[038be32] | 455 | } |
---|
| 456 | #endif |
---|
[d384787] | 457 | |
---|
[92976d9] | 458 | // Shutdown the io rings |
---|
[61dd73d] | 459 | struct __submition_data & sq = this.io->submit_q; |
---|
| 460 | struct __completion_data & cq = this.io->completion_q; |
---|
[92976d9] | 461 | |
---|
| 462 | // unmap the submit queue entries |
---|
[2d8f7b0] | 463 | munmap(sq.sqes, (*sq.num) * sizeof(struct io_uring_sqe)); |
---|
[92976d9] | 464 | |
---|
| 465 | // unmap the Submit Queue ring |
---|
| 466 | munmap(sq.ring_ptr, sq.ring_sz); |
---|
| 467 | |
---|
| 468 | // unmap the Completion Queue ring, if it is different |
---|
| 469 | if (cq.ring_ptr != sq.ring_ptr) { |
---|
| 470 | munmap(cq.ring_ptr, cq.ring_sz); |
---|
| 471 | } |
---|
| 472 | |
---|
| 473 | // close the file descriptor |
---|
[61dd73d] | 474 | close(this.io->fd); |
---|
| 475 | |
---|
[5dadc9b] | 476 | free( this.io->submit_q.ready ); // Maybe null, doesn't matter |
---|
[61dd73d] | 477 | free( this.io ); |
---|
[92976d9] | 478 | } |
---|
| 479 | |
---|
| 480 | //============================================================================================= |
---|
| 481 | // I/O Polling |
---|
| 482 | //============================================================================================= |
---|
| 483 | struct io_user_data { |
---|
| 484 | int32_t result; |
---|
| 485 | $thread * thrd; |
---|
| 486 | }; |
---|
| 487 | |
---|
| 488 | // Process a single completion message from the io_uring |
---|
| 489 | // This is NOT thread-safe |
---|
[5dadc9b] | 490 | static [int, bool] __drain_io( & struct __io_data ring, * sigset_t mask, int waitcnt, bool in_kernel ) { |
---|
| 491 | unsigned to_submit = 0; |
---|
| 492 | if( ring.cltr_flags & CFA_CLUSTER_IO_POLLER_THREAD_SUBMITS ) { |
---|
| 493 | |
---|
| 494 | // If the poller thread also submits, then we need to aggregate the submissions which are ready |
---|
| 495 | uint32_t * tail = ring.submit_q.tail; |
---|
| 496 | const uint32_t mask = *ring.submit_q.mask; |
---|
| 497 | |
---|
| 498 | // Go through the list of ready submissions |
---|
| 499 | for( i; ring.submit_q.ready_cnt ) { |
---|
| 500 | // replace any submission with the sentinel, to consume it. |
---|
| 501 | uint32_t idx = __atomic_exchange_n( &ring.submit_q.ready[i], -1ul32, __ATOMIC_RELAXED); |
---|
| 502 | |
---|
| 503 | // If it was already the sentinel, then we are done |
---|
| 504 | if( idx == -1ul32 ) continue; |
---|
| 505 | |
---|
| 506 | // If we got a real submission, append it to the list |
---|
| 507 | ring.submit_q.array[ ((*tail) + to_submit) & mask ] = idx & mask; |
---|
| 508 | to_submit++; |
---|
| 509 | } |
---|
| 510 | |
---|
| 511 | // Increment the tail based on how many we are ready to submit |
---|
| 512 | __atomic_fetch_add(tail, to_submit, __ATOMIC_SEQ_CST); |
---|
| 513 | |
---|
| 514 | // update statistics |
---|
| 515 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 516 | ring.submit_q.stats.submit_avg.val += to_submit; |
---|
| 517 | ring.submit_q.stats.submit_avg.cnt += 1; |
---|
| 518 | #endif |
---|
| 519 | } |
---|
| 520 | |
---|
| 521 | int ret = syscall( __NR_io_uring_enter, ring.fd, to_submit, waitcnt, IORING_ENTER_GETEVENTS, mask, _NSIG / 8); |
---|
[d384787] | 522 | if( ret < 0 ) { |
---|
| 523 | switch((int)errno) { |
---|
| 524 | case EAGAIN: |
---|
| 525 | case EINTR: |
---|
| 526 | return -EAGAIN; |
---|
| 527 | default: |
---|
| 528 | abort( "KERNEL ERROR: IO_URING WAIT - %s\n", strerror(errno) ); |
---|
| 529 | } |
---|
| 530 | } |
---|
| 531 | |
---|
| 532 | // Drain the queue |
---|
[92976d9] | 533 | unsigned head = *ring.completion_q.head; |
---|
| 534 | unsigned tail = __atomic_load_n(ring.completion_q.tail, __ATOMIC_ACQUIRE); |
---|
| 535 | |
---|
[d384787] | 536 | // Nothing was new return 0 |
---|
| 537 | if (head == tail) { |
---|
| 538 | return 0; |
---|
| 539 | } |
---|
[92976d9] | 540 | |
---|
[d384787] | 541 | uint32_t count = tail - head; |
---|
| 542 | for(i; count) { |
---|
| 543 | unsigned idx = (head + i) & (*ring.completion_q.mask); |
---|
| 544 | struct io_uring_cqe & cqe = ring.completion_q.cqes[idx]; |
---|
[92976d9] | 545 | |
---|
[d384787] | 546 | /* paranoid */ verify(&cqe); |
---|
[92976d9] | 547 | |
---|
[d384787] | 548 | struct io_user_data * data = (struct io_user_data *)cqe.user_data; |
---|
[4069faad] | 549 | __cfadbg_print_safe( io, "Kernel I/O : Performed reading io cqe %p, result %d for %p\n", data, cqe.res, data->thrd ); |
---|
[2d8f7b0] | 550 | |
---|
[d384787] | 551 | data->result = cqe.res; |
---|
[f6660520] | 552 | if(!in_kernel) { unpark( data->thrd __cfaabi_dbg_ctx2 ); } |
---|
| 553 | else { __unpark( data->thrd __cfaabi_dbg_ctx2 ); } |
---|
[d384787] | 554 | } |
---|
[2d8f7b0] | 555 | |
---|
| 556 | // Allow new submissions to happen |
---|
[d384787] | 557 | V(ring.submit, count); |
---|
[92976d9] | 558 | |
---|
| 559 | // Mark to the kernel that the cqe has been seen |
---|
| 560 | // Ensure that the kernel only sees the new value of the head index after the CQEs have been read. |
---|
[d384787] | 561 | __atomic_fetch_add( ring.completion_q.head, count, __ATOMIC_RELAXED ); |
---|
[92976d9] | 562 | |
---|
[5dadc9b] | 563 | return [count, count > 0 || to_submit > 0]; |
---|
[92976d9] | 564 | } |
---|
| 565 | |
---|
[f6660520] | 566 | static void * __io_poller_slow( void * arg ) { |
---|
[92976d9] | 567 | cluster * cltr = (cluster *)arg; |
---|
[61dd73d] | 568 | struct __io_data & ring = *cltr->io; |
---|
[92976d9] | 569 | |
---|
| 570 | sigset_t mask; |
---|
| 571 | sigfillset(&mask); |
---|
| 572 | if ( pthread_sigmask( SIG_BLOCK, &mask, 0p ) == -1 ) { |
---|
| 573 | abort( "KERNEL ERROR: IO_URING - pthread_sigmask" ); |
---|
| 574 | } |
---|
| 575 | |
---|
| 576 | sigdelset( &mask, SIGUSR1 ); |
---|
| 577 | |
---|
| 578 | verify( (*ring.submit_q.head) == (*ring.submit_q.tail) ); |
---|
| 579 | verify( (*ring.completion_q.head) == (*ring.completion_q.tail) ); |
---|
| 580 | |
---|
[1539bbd] | 581 | __cfadbg_print_safe(io_core, "Kernel I/O : Slow poller for ring %p ready\n", &ring); |
---|
| 582 | |
---|
[b6f2b213] | 583 | if( ring.cltr_flags & CFA_CLUSTER_IO_POLLER_USER_THREAD ) { |
---|
| 584 | while(!__atomic_load_n(&ring.done, __ATOMIC_SEQ_CST)) { |
---|
[5dadc9b] | 585 | |
---|
[5c581cc] | 586 | __atomic_store_n( &ring.poller.slow.blocked, true, __ATOMIC_SEQ_CST ); |
---|
| 587 | |
---|
[f6660520] | 588 | // In the user-thread approach drain and if anything was drained, |
---|
| 589 | // batton pass to the user-thread |
---|
[5dadc9b] | 590 | int count; |
---|
| 591 | bool again; |
---|
[5c581cc] | 592 | [count, again] = __drain_io( ring, &mask, 1, true ); |
---|
| 593 | |
---|
| 594 | __atomic_store_n( &ring.poller.slow.blocked, false, __ATOMIC_SEQ_CST ); |
---|
[3c039b0] | 595 | |
---|
| 596 | // Update statistics |
---|
| 597 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 598 | ring.completion_q.stats.completed_avg.val += count; |
---|
| 599 | ring.completion_q.stats.completed_avg.slow_cnt += 1; |
---|
| 600 | #endif |
---|
| 601 | |
---|
[5dadc9b] | 602 | if(again) { |
---|
[0a805f2] | 603 | __cfadbg_print_safe(io_core, "Kernel I/O : Moving to ring %p to fast poller\n", &ring); |
---|
[f6660520] | 604 | __unpark( &ring.poller.fast.thrd __cfaabi_dbg_ctx2 ); |
---|
| 605 | wait( ring.poller.sem ); |
---|
| 606 | } |
---|
[b6f2b213] | 607 | } |
---|
| 608 | } |
---|
| 609 | else { |
---|
| 610 | while(!__atomic_load_n(&ring.done, __ATOMIC_SEQ_CST)) { |
---|
[f6660520] | 611 | //In the naive approach, just poll the io completion queue directly |
---|
[5dadc9b] | 612 | int count; |
---|
| 613 | bool again; |
---|
| 614 | [count, again] = __drain_io( ring, &mask, 1, true ); |
---|
[3c039b0] | 615 | |
---|
| 616 | // Update statistics |
---|
| 617 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 618 | ring.completion_q.stats.completed_avg.val += count; |
---|
| 619 | ring.completion_q.stats.completed_avg.slow_cnt += 1; |
---|
| 620 | #endif |
---|
[b6f2b213] | 621 | } |
---|
[92976d9] | 622 | } |
---|
| 623 | |
---|
[1539bbd] | 624 | __cfadbg_print_safe(io_core, "Kernel I/O : Slow poller for ring %p stopping\n", &ring); |
---|
| 625 | |
---|
[92976d9] | 626 | return 0p; |
---|
| 627 | } |
---|
| 628 | |
---|
[61dd73d] | 629 | void main( __io_poller_fast & this ) { |
---|
[b6f2b213] | 630 | verify( this.ring->cltr_flags & CFA_CLUSTER_IO_POLLER_USER_THREAD ); |
---|
| 631 | |
---|
[61dd73d] | 632 | // Start parked |
---|
| 633 | park( __cfaabi_dbg_ctx ); |
---|
[f6660520] | 634 | |
---|
[61dd73d] | 635 | __cfadbg_print_safe(io_core, "Kernel I/O : Fast poller for ring %p ready\n", &this.ring); |
---|
[1539bbd] | 636 | |
---|
[4e74466] | 637 | int reset = 0; |
---|
| 638 | |
---|
[61dd73d] | 639 | // Then loop until we need to start |
---|
| 640 | while(!__atomic_load_n(&this.ring->done, __ATOMIC_SEQ_CST)) { |
---|
[5dadc9b] | 641 | |
---|
[61dd73d] | 642 | // Drain the io |
---|
[5dadc9b] | 643 | int count; |
---|
| 644 | bool again; |
---|
| 645 | [count, again] = __drain_io( *this.ring, 0p, 0, false ); |
---|
| 646 | |
---|
| 647 | if(!again) reset++; |
---|
[3c039b0] | 648 | |
---|
[61dd73d] | 649 | // Update statistics |
---|
| 650 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 651 | this.ring->completion_q.stats.completed_avg.val += count; |
---|
| 652 | this.ring->completion_q.stats.completed_avg.fast_cnt += 1; |
---|
| 653 | #endif |
---|
[3c039b0] | 654 | |
---|
[5dadc9b] | 655 | // If we got something, just yield and check again |
---|
[4e74466] | 656 | if(reset < 5) { |
---|
[61dd73d] | 657 | yield(); |
---|
| 658 | } |
---|
[5dadc9b] | 659 | // We didn't get anything baton pass to the slow poller |
---|
[61dd73d] | 660 | else { |
---|
| 661 | __cfadbg_print_safe(io_core, "Kernel I/O : Moving to ring %p to slow poller\n", &this.ring); |
---|
[5dadc9b] | 662 | reset = 0; |
---|
| 663 | |
---|
| 664 | // wake up the slow poller |
---|
[61dd73d] | 665 | post( this.ring->poller.sem ); |
---|
[5dadc9b] | 666 | |
---|
| 667 | // park this thread |
---|
[61dd73d] | 668 | park( __cfaabi_dbg_ctx ); |
---|
[f6660520] | 669 | } |
---|
| 670 | } |
---|
[61dd73d] | 671 | |
---|
| 672 | __cfadbg_print_safe(io_core, "Kernel I/O : Fast poller for ring %p stopping\n", &this.ring); |
---|
| 673 | } |
---|
[f6660520] | 674 | |
---|
[0335620] | 675 | static inline void __wake_poller( struct __io_data & ring ) __attribute__((artificial)); |
---|
[5dadc9b] | 676 | static inline void __wake_poller( struct __io_data & ring ) { |
---|
[5c581cc] | 677 | if(!__atomic_load_n( &ring.poller.slow.blocked, __ATOMIC_SEQ_CST)) return; |
---|
| 678 | |
---|
| 679 | sigval val = { 1 }; |
---|
| 680 | pthread_sigqueue( ring.poller.slow.kthrd, SIGUSR1, val ); |
---|
[5dadc9b] | 681 | } |
---|
| 682 | |
---|
[92976d9] | 683 | //============================================================================================= |
---|
| 684 | // I/O Submissions |
---|
| 685 | //============================================================================================= |
---|
| 686 | |
---|
[2d8f7b0] | 687 | // Submition steps : |
---|
| 688 | // 1 - We need to make sure we don't overflow any of the buffer, P(ring.submit) to make sure |
---|
| 689 | // entries are available. The semaphore make sure that there is no more operations in |
---|
| 690 | // progress then the number of entries in the buffer. This probably limits concurrency |
---|
| 691 | // more than necessary since submitted but not completed operations don't need any |
---|
| 692 | // entries in user space. However, I don't know what happens if we overflow the buffers |
---|
| 693 | // because too many requests completed at once. This is a safe approach in all cases. |
---|
| 694 | // Furthermore, with hundreds of entries, this may be okay. |
---|
| 695 | // |
---|
| 696 | // 2 - Allocate a queue entry. The ring already has memory for all entries but only the ones |
---|
| 697 | // listed in sq.array are visible by the kernel. For those not listed, the kernel does not |
---|
| 698 | // offer any assurance that an entry is not being filled by multiple flags. Therefore, we |
---|
| 699 | // need to write an allocator that allows allocating concurrently. |
---|
| 700 | // |
---|
| 701 | // 3 - Actually fill the submit entry, this is the only simple and straightforward step. |
---|
| 702 | // |
---|
| 703 | // 4 - Append the entry index to the array and adjust the tail accordingly. This operation |
---|
| 704 | // needs to arrive to two concensus at the same time: |
---|
| 705 | // A - The order in which entries are listed in the array: no two threads must pick the |
---|
| 706 | // same index for their entries |
---|
| 707 | // B - When can the tail be update for the kernel. EVERY entries in the array between |
---|
| 708 | // head and tail must be fully filled and shouldn't ever be touched again. |
---|
| 709 | // |
---|
| 710 | |
---|
[61dd73d] | 711 | static inline [* struct io_uring_sqe, uint32_t] __submit_alloc( struct __io_data & ring ) { |
---|
[2489d31] | 712 | // Wait for a spot to be available |
---|
[05cfa4d] | 713 | __attribute__((unused)) bool blocked = P(ring.submit); |
---|
| 714 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 715 | __atomic_fetch_add( &ring.submit_q.stats.submit_avg.block, blocked ? 1ul64 : 0ul64, __ATOMIC_RELAXED ); |
---|
| 716 | #endif |
---|
[2489d31] | 717 | |
---|
| 718 | // Allocate the sqe |
---|
| 719 | uint32_t idx = __atomic_fetch_add(&ring.submit_q.alloc, 1ul32, __ATOMIC_SEQ_CST); |
---|
| 720 | |
---|
[5dadc9b] | 721 | // Mask the idx now to allow make everything easier to check |
---|
| 722 | idx &= *ring.submit_q.mask; |
---|
[2489d31] | 723 | |
---|
| 724 | // Return the sqe |
---|
[5dadc9b] | 725 | return [&ring.submit_q.sqes[ idx ], idx]; |
---|
[2489d31] | 726 | } |
---|
| 727 | |
---|
[61dd73d] | 728 | static inline void __submit( struct __io_data & ring, uint32_t idx ) { |
---|
[5dadc9b] | 729 | // Get now the data we definetely need |
---|
| 730 | uint32_t * const tail = ring.submit_q.tail; |
---|
[2489d31] | 731 | const uint32_t mask = *ring.submit_q.mask; |
---|
| 732 | |
---|
[5dadc9b] | 733 | // There are 2 submission schemes, check which one we are using |
---|
| 734 | if( ring.cltr_flags & CFA_CLUSTER_IO_POLLER_THREAD_SUBMITS ) { |
---|
| 735 | // If the poller thread submits, then we just need to add this to the ready array |
---|
[2489d31] | 736 | |
---|
[5dadc9b] | 737 | /* paranoid */ verify( idx <= mask ); |
---|
| 738 | /* paranoid */ verify( idx != -1ul32 ); |
---|
| 739 | |
---|
| 740 | // We need to find a spot in the ready array |
---|
| 741 | __attribute((unused)) int len = 0; |
---|
| 742 | __attribute((unused)) int block = 0; |
---|
| 743 | uint32_t expected = -1ul32; |
---|
[5c581cc] | 744 | uint32_t ready_mask = ring.submit_q.ready_cnt - 1; |
---|
| 745 | uint32_t off = __tls_rand(); |
---|
| 746 | LOOKING: for() { |
---|
[5dadc9b] | 747 | for(i; ring.submit_q.ready_cnt) { |
---|
[5c581cc] | 748 | uint32_t ii = (i + off) & ready_mask; |
---|
| 749 | if( __atomic_compare_exchange_n( &ring.submit_q.ready[ii], &expected, idx, true, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED ) ) { |
---|
[5dadc9b] | 750 | break LOOKING; |
---|
| 751 | } |
---|
| 752 | |
---|
| 753 | len ++; |
---|
| 754 | } |
---|
| 755 | |
---|
| 756 | block++; |
---|
| 757 | yield(); |
---|
[2489d31] | 758 | } |
---|
[5dadc9b] | 759 | |
---|
| 760 | __wake_poller( ring ); |
---|
| 761 | |
---|
| 762 | // update statistics |
---|
| 763 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 764 | __atomic_fetch_add( &ring.submit_q.stats.look_avg.val, len, __ATOMIC_RELAXED ); |
---|
| 765 | __atomic_fetch_add( &ring.submit_q.stats.look_avg.block, block, __ATOMIC_RELAXED ); |
---|
| 766 | __atomic_fetch_add( &ring.submit_q.stats.look_avg.cnt, 1, __ATOMIC_RELAXED ); |
---|
| 767 | #endif |
---|
[dd4e2d7] | 768 | |
---|
| 769 | __cfadbg_print_safe( io, "Kernel I/O : Added %u to ready for %p\n", idx, active_thread() ); |
---|
[2d8f7b0] | 770 | } |
---|
[5dadc9b] | 771 | else { |
---|
| 772 | // get mutual exclusion |
---|
| 773 | lock(ring.submit_q.lock __cfaabi_dbg_ctx2); |
---|
[2489d31] | 774 | |
---|
[5dadc9b] | 775 | // Append to the list of ready entries |
---|
| 776 | |
---|
| 777 | /* paranoid */ verify( idx <= mask ); |
---|
| 778 | |
---|
| 779 | ring.submit_q.array[ (*tail) & mask ] = idx & mask; |
---|
| 780 | __atomic_fetch_add(tail, 1ul32, __ATOMIC_SEQ_CST); |
---|
[d384787] | 781 | |
---|
[5dadc9b] | 782 | // Submit however, many entries need to be submitted |
---|
| 783 | int ret = syscall( __NR_io_uring_enter, ring.fd, 1, 0, 0, 0p, 0); |
---|
| 784 | if( ret < 0 ) { |
---|
| 785 | switch((int)errno) { |
---|
| 786 | default: |
---|
| 787 | abort( "KERNEL ERROR: IO_URING SUBMIT - %s\n", strerror(errno) ); |
---|
| 788 | } |
---|
| 789 | } |
---|
| 790 | |
---|
| 791 | // update statistics |
---|
| 792 | #if !defined(__CFA_NO_STATISTICS__) |
---|
| 793 | ring.submit_q.stats.submit_avg.val += 1; |
---|
| 794 | ring.submit_q.stats.submit_avg.cnt += 1; |
---|
| 795 | #endif |
---|
| 796 | |
---|
| 797 | unlock(ring.submit_q.lock); |
---|
[dd4e2d7] | 798 | |
---|
| 799 | __cfadbg_print_safe( io, "Kernel I/O : Performed io_submit for %p, returned %d\n", active_thread(), ret ); |
---|
[5dadc9b] | 800 | } |
---|
[2489d31] | 801 | } |
---|
| 802 | |
---|
| 803 | static inline void ?{}(struct io_uring_sqe & this, uint8_t opcode, int fd) { |
---|
| 804 | this.opcode = opcode; |
---|
| 805 | #if !defined(IOSQE_ASYNC) |
---|
| 806 | this.flags = 0; |
---|
| 807 | #else |
---|
| 808 | this.flags = IOSQE_ASYNC; |
---|
| 809 | #endif |
---|
| 810 | this.ioprio = 0; |
---|
| 811 | this.fd = fd; |
---|
| 812 | this.off = 0; |
---|
| 813 | this.addr = 0; |
---|
| 814 | this.len = 0; |
---|
| 815 | this.rw_flags = 0; |
---|
| 816 | this.__pad2[0] = this.__pad2[1] = this.__pad2[2] = 0; |
---|
[2d8f7b0] | 817 | } |
---|
| 818 | |
---|
[2489d31] | 819 | static inline void ?{}(struct io_uring_sqe & this, uint8_t opcode, int fd, void * addr, uint32_t len, uint64_t off ) { |
---|
| 820 | (this){ opcode, fd }; |
---|
| 821 | this.off = off; |
---|
| 822 | this.addr = (uint64_t)addr; |
---|
| 823 | this.len = len; |
---|
| 824 | } |
---|
[f6660520] | 825 | |
---|
[92976d9] | 826 | |
---|
| 827 | //============================================================================================= |
---|
| 828 | // I/O Interface |
---|
| 829 | //============================================================================================= |
---|
[f6660520] | 830 | |
---|
[2d8f7b0] | 831 | #define __submit_prelude \ |
---|
[61dd73d] | 832 | struct __io_data & ring = *active_cluster()->io; \ |
---|
[2d8f7b0] | 833 | struct io_uring_sqe * sqe; \ |
---|
| 834 | uint32_t idx; \ |
---|
| 835 | [sqe, idx] = __submit_alloc( ring ); |
---|
| 836 | |
---|
| 837 | #define __submit_wait \ |
---|
| 838 | io_user_data data = { 0, active_thread() }; \ |
---|
[185efe6] | 839 | /*__cfaabi_bits_print_safe( STDERR_FILENO, "Preparing user data %p for %p\n", &data, data.thrd );*/ \ |
---|
[2d8f7b0] | 840 | sqe->user_data = (uint64_t)&data; \ |
---|
| 841 | __submit( ring, idx ); \ |
---|
| 842 | park( __cfaabi_dbg_ctx ); \ |
---|
| 843 | return data.result; |
---|
[ecf6b46] | 844 | #endif |
---|
[2d8f7b0] | 845 | |
---|
[0ea6c5a] | 846 | // Some forward declarations |
---|
| 847 | extern "C" { |
---|
[1268ad8] | 848 | #include <unistd.h> |
---|
[0ea6c5a] | 849 | #include <sys/types.h> |
---|
[93f7c001] | 850 | #include <sys/socket.h> |
---|
[6136ecc] | 851 | #include <sys/syscall.h> |
---|
[08a994e] | 852 | |
---|
| 853 | #if defined(HAVE_PREADV2) |
---|
[0ea6c5a] | 854 | struct iovec; |
---|
| 855 | extern ssize_t preadv2 (int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags); |
---|
[08a994e] | 856 | #endif |
---|
| 857 | #if defined(HAVE_PWRITEV2) |
---|
| 858 | struct iovec; |
---|
[0ea6c5a] | 859 | extern ssize_t pwritev2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags); |
---|
[08a994e] | 860 | #endif |
---|
[0ea6c5a] | 861 | |
---|
| 862 | extern int fsync(int fd); |
---|
| 863 | extern int sync_file_range(int fd, int64_t offset, int64_t nbytes, unsigned int flags); |
---|
| 864 | |
---|
| 865 | struct msghdr; |
---|
| 866 | struct sockaddr; |
---|
| 867 | extern ssize_t sendmsg(int sockfd, const struct msghdr *msg, int flags); |
---|
| 868 | extern ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags); |
---|
| 869 | extern ssize_t send(int sockfd, const void *buf, size_t len, int flags); |
---|
| 870 | extern ssize_t recv(int sockfd, void *buf, size_t len, int flags); |
---|
| 871 | extern int accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags); |
---|
| 872 | extern int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen); |
---|
| 873 | |
---|
| 874 | extern int fallocate(int fd, int mode, uint64_t offset, uint64_t len); |
---|
| 875 | extern int posix_fadvise(int fd, uint64_t offset, uint64_t len, int advice); |
---|
| 876 | extern int madvise(void *addr, size_t length, int advice); |
---|
| 877 | |
---|
| 878 | extern int openat(int dirfd, const char *pathname, int flags, mode_t mode); |
---|
| 879 | extern int close(int fd); |
---|
| 880 | |
---|
| 881 | extern ssize_t read (int fd, void *buf, size_t count); |
---|
| 882 | } |
---|
| 883 | |
---|
[2d8f7b0] | 884 | //----------------------------------------------------------------------------- |
---|
| 885 | // Asynchronous operations |
---|
[08a994e] | 886 | #if defined(HAVE_PREADV2) |
---|
| 887 | ssize_t cfa_preadv2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags) { |
---|
| 888 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_READV) |
---|
| 889 | return preadv2(fd, iov, iovcnt, offset, flags); |
---|
| 890 | #else |
---|
| 891 | __submit_prelude |
---|
[ecf6b46] | 892 | |
---|
[08a994e] | 893 | (*sqe){ IORING_OP_READV, fd, iov, iovcnt, offset }; |
---|
[ecf6b46] | 894 | |
---|
[08a994e] | 895 | __submit_wait |
---|
| 896 | #endif |
---|
| 897 | } |
---|
| 898 | #endif |
---|
[ecf6b46] | 899 | |
---|
[08a994e] | 900 | #if defined(HAVE_PWRITEV2) |
---|
| 901 | ssize_t cfa_pwritev2(int fd, const struct iovec *iov, int iovcnt, off_t offset, int flags) { |
---|
| 902 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_WRITEV) |
---|
| 903 | return pwritev2(fd, iov, iovcnt, offset, flags); |
---|
| 904 | #else |
---|
| 905 | __submit_prelude |
---|
[ecf6b46] | 906 | |
---|
[08a994e] | 907 | (*sqe){ IORING_OP_WRITEV, fd, iov, iovcnt, offset }; |
---|
[ecf6b46] | 908 | |
---|
[08a994e] | 909 | __submit_wait |
---|
| 910 | #endif |
---|
| 911 | } |
---|
| 912 | #endif |
---|
[ecf6b46] | 913 | |
---|
| 914 | int cfa_fsync(int fd) { |
---|
| 915 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_FSYNC) |
---|
| 916 | return fsync(fd); |
---|
| 917 | #else |
---|
| 918 | __submit_prelude |
---|
| 919 | |
---|
| 920 | (*sqe){ IORING_OP_FSYNC, fd }; |
---|
| 921 | |
---|
| 922 | __submit_wait |
---|
| 923 | #endif |
---|
| 924 | } |
---|
| 925 | |
---|
| 926 | int cfa_sync_file_range(int fd, int64_t offset, int64_t nbytes, unsigned int flags) { |
---|
| 927 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_SYNC_FILE_RANGE) |
---|
| 928 | return sync_file_range(fd, offset, nbytes, flags); |
---|
| 929 | #else |
---|
| 930 | __submit_prelude |
---|
| 931 | |
---|
| 932 | (*sqe){ IORING_OP_SYNC_FILE_RANGE, fd }; |
---|
| 933 | sqe->off = offset; |
---|
| 934 | sqe->len = nbytes; |
---|
| 935 | sqe->sync_range_flags = flags; |
---|
| 936 | |
---|
| 937 | __submit_wait |
---|
| 938 | #endif |
---|
| 939 | } |
---|
| 940 | |
---|
| 941 | |
---|
| 942 | ssize_t cfa_sendmsg(int sockfd, const struct msghdr *msg, int flags) { |
---|
| 943 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_SENDMSG) |
---|
[2292067] | 944 | return sendmsg(sockfd, msg, flags); |
---|
[ecf6b46] | 945 | #else |
---|
| 946 | __submit_prelude |
---|
| 947 | |
---|
| 948 | (*sqe){ IORING_OP_SENDMSG, sockfd, msg, 1, 0 }; |
---|
| 949 | sqe->msg_flags = flags; |
---|
| 950 | |
---|
| 951 | __submit_wait |
---|
| 952 | #endif |
---|
| 953 | } |
---|
| 954 | |
---|
| 955 | ssize_t cfa_recvmsg(int sockfd, struct msghdr *msg, int flags) { |
---|
| 956 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_RECVMSG) |
---|
[2292067] | 957 | return recvmsg(sockfd, msg, flags); |
---|
[ecf6b46] | 958 | #else |
---|
| 959 | __submit_prelude |
---|
| 960 | |
---|
| 961 | (*sqe){ IORING_OP_RECVMSG, sockfd, msg, 1, 0 }; |
---|
| 962 | sqe->msg_flags = flags; |
---|
| 963 | |
---|
| 964 | __submit_wait |
---|
| 965 | #endif |
---|
| 966 | } |
---|
| 967 | |
---|
| 968 | ssize_t cfa_send(int sockfd, const void *buf, size_t len, int flags) { |
---|
| 969 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_SEND) |
---|
| 970 | return send( sockfd, buf, len, flags ); |
---|
| 971 | #else |
---|
| 972 | __submit_prelude |
---|
| 973 | |
---|
| 974 | (*sqe){ IORING_OP_SEND, sockfd }; |
---|
| 975 | sqe->addr = (uint64_t)buf; |
---|
| 976 | sqe->len = len; |
---|
| 977 | sqe->msg_flags = flags; |
---|
| 978 | |
---|
| 979 | __submit_wait |
---|
| 980 | #endif |
---|
| 981 | } |
---|
| 982 | |
---|
| 983 | ssize_t cfa_recv(int sockfd, void *buf, size_t len, int flags) { |
---|
| 984 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_RECV) |
---|
| 985 | return recv( sockfd, buf, len, flags ); |
---|
| 986 | #else |
---|
| 987 | __submit_prelude |
---|
| 988 | |
---|
| 989 | (*sqe){ IORING_OP_RECV, sockfd }; |
---|
| 990 | sqe->addr = (uint64_t)buf; |
---|
| 991 | sqe->len = len; |
---|
| 992 | sqe->msg_flags = flags; |
---|
| 993 | |
---|
| 994 | __submit_wait |
---|
| 995 | #endif |
---|
| 996 | } |
---|
| 997 | |
---|
| 998 | int cfa_accept4(int sockfd, struct sockaddr *addr, socklen_t *addrlen, int flags) { |
---|
| 999 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_ACCEPT) |
---|
[0ea6c5a] | 1000 | return accept4( sockfd, addr, addrlen, flags ); |
---|
[ecf6b46] | 1001 | #else |
---|
| 1002 | __submit_prelude |
---|
| 1003 | |
---|
| 1004 | (*sqe){ IORING_OP_ACCEPT, sockfd }; |
---|
| 1005 | sqe->addr = addr; |
---|
| 1006 | sqe->addr2 = addrlen; |
---|
| 1007 | sqe->accept_flags = flags; |
---|
| 1008 | |
---|
| 1009 | __submit_wait |
---|
| 1010 | #endif |
---|
| 1011 | } |
---|
| 1012 | |
---|
| 1013 | int cfa_connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen) { |
---|
| 1014 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_CONNECT) |
---|
[0ea6c5a] | 1015 | return connect( sockfd, addr, addrlen ); |
---|
[ecf6b46] | 1016 | #else |
---|
| 1017 | __submit_prelude |
---|
| 1018 | |
---|
| 1019 | (*sqe){ IORING_OP_CONNECT, sockfd }; |
---|
| 1020 | sqe->addr = (uint64_t)addr; |
---|
| 1021 | sqe->off = addrlen; |
---|
| 1022 | |
---|
| 1023 | __submit_wait |
---|
| 1024 | #endif |
---|
| 1025 | } |
---|
| 1026 | |
---|
| 1027 | int cfa_fallocate(int fd, int mode, uint64_t offset, uint64_t len) { |
---|
| 1028 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_FALLOCATE) |
---|
| 1029 | return fallocate( fd, mode, offset, len ); |
---|
| 1030 | #else |
---|
| 1031 | __submit_prelude |
---|
| 1032 | |
---|
| 1033 | (*sqe){ IORING_OP_FALLOCATE, fd }; |
---|
| 1034 | sqe->off = offset; |
---|
| 1035 | sqe->len = length; |
---|
| 1036 | sqe->mode = mode; |
---|
| 1037 | |
---|
| 1038 | __submit_wait |
---|
| 1039 | #endif |
---|
| 1040 | } |
---|
| 1041 | |
---|
| 1042 | int cfa_fadvise(int fd, uint64_t offset, uint64_t len, int advice) { |
---|
| 1043 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_FADVISE) |
---|
| 1044 | return posix_fadvise( fd, offset, len, advice ); |
---|
| 1045 | #else |
---|
| 1046 | __submit_prelude |
---|
| 1047 | |
---|
| 1048 | (*sqe){ IORING_OP_FADVISE, fd }; |
---|
| 1049 | sqe->off = (uint64_t)offset; |
---|
| 1050 | sqe->len = length; |
---|
| 1051 | sqe->fadvise_advice = advice; |
---|
| 1052 | |
---|
| 1053 | __submit_wait |
---|
| 1054 | #endif |
---|
| 1055 | } |
---|
| 1056 | |
---|
| 1057 | int cfa_madvise(void *addr, size_t length, int advice) { |
---|
| 1058 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_MADVISE) |
---|
| 1059 | return madvise( addr, length, advice ); |
---|
| 1060 | #else |
---|
| 1061 | __submit_prelude |
---|
| 1062 | |
---|
| 1063 | (*sqe){ IORING_OP_MADVISE, 0 }; |
---|
| 1064 | sqe->addr = (uint64_t)addr; |
---|
| 1065 | sqe->len = length; |
---|
| 1066 | sqe->fadvise_advice = advice; |
---|
| 1067 | |
---|
| 1068 | __submit_wait |
---|
| 1069 | #endif |
---|
| 1070 | } |
---|
| 1071 | |
---|
| 1072 | int cfa_openat(int dirfd, const char *pathname, int flags, mode_t mode) { |
---|
| 1073 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_OPENAT) |
---|
| 1074 | return openat( dirfd, pathname, flags, mode ); |
---|
| 1075 | #else |
---|
| 1076 | __submit_prelude |
---|
| 1077 | |
---|
| 1078 | (*sqe){ IORING_OP_OPENAT, dirfd }; |
---|
| 1079 | sqe->addr = (uint64_t)pathname; |
---|
| 1080 | sqe->open_flags = flags; |
---|
| 1081 | sqe->mode = mode; |
---|
| 1082 | |
---|
| 1083 | __submit_wait |
---|
| 1084 | #endif |
---|
| 1085 | } |
---|
| 1086 | |
---|
| 1087 | int cfa_close(int fd) { |
---|
| 1088 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_CLOSE) |
---|
| 1089 | return close( fd ); |
---|
| 1090 | #else |
---|
| 1091 | __submit_prelude |
---|
| 1092 | |
---|
| 1093 | (*sqe){ IORING_OP_CLOSE, fd }; |
---|
| 1094 | |
---|
| 1095 | __submit_wait |
---|
| 1096 | #endif |
---|
| 1097 | } |
---|
| 1098 | |
---|
| 1099 | |
---|
| 1100 | ssize_t cfa_read(int fd, void *buf, size_t count) { |
---|
| 1101 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_READ) |
---|
| 1102 | return read( fd, buf, count ); |
---|
| 1103 | #else |
---|
| 1104 | __submit_prelude |
---|
| 1105 | |
---|
| 1106 | (*sqe){ IORING_OP_READ, fd, buf, count, 0 }; |
---|
| 1107 | |
---|
| 1108 | __submit_wait |
---|
| 1109 | #endif |
---|
| 1110 | } |
---|
| 1111 | |
---|
| 1112 | ssize_t cfa_write(int fd, void *buf, size_t count) { |
---|
| 1113 | #if !defined(HAVE_LINUX_IO_URING_H) || !defined(IORING_OP_WRITE) |
---|
| 1114 | return read( fd, buf, count ); |
---|
| 1115 | #else |
---|
| 1116 | __submit_prelude |
---|
| 1117 | |
---|
| 1118 | (*sqe){ IORING_OP_WRITE, fd, buf, count, 0 }; |
---|
| 1119 | |
---|
| 1120 | __submit_wait |
---|
| 1121 | #endif |
---|
| 1122 | } |
---|
[2d8f7b0] | 1123 | |
---|
| 1124 | //----------------------------------------------------------------------------- |
---|
| 1125 | // Check if a function is asynchronous |
---|
| 1126 | |
---|
| 1127 | // Macro magic to reduce the size of the following switch case |
---|
[ecf6b46] | 1128 | #define IS_DEFINED_APPLY(f, ...) f(__VA_ARGS__) |
---|
| 1129 | #define IS_DEFINED_SECOND(first, second, ...) second |
---|
| 1130 | #define IS_DEFINED_TEST(expansion) _CFA_IO_FEATURE_##expansion |
---|
| 1131 | #define IS_DEFINED(macro) IS_DEFINED_APPLY( IS_DEFINED_SECOND,IS_DEFINED_TEST(macro) false, true) |
---|
[2d8f7b0] | 1132 | |
---|
[ecf6b46] | 1133 | bool has_user_level_blocking( fptr_t func ) { |
---|
| 1134 | #if defined(HAVE_LINUX_IO_URING_H) |
---|
[08a994e] | 1135 | #if defined(HAVE_PREADV2) |
---|
[171ca0d] | 1136 | if( /*func == (fptr_t)preadv2 || */ |
---|
| 1137 | func == (fptr_t)cfa_preadv2 ) |
---|
| 1138 | #define _CFA_IO_FEATURE_IORING_OP_READV , |
---|
| 1139 | return IS_DEFINED(IORING_OP_READV); |
---|
| 1140 | #endif |
---|
| 1141 | |
---|
| 1142 | #if defined(HAVE_PWRITEV2) |
---|
[08a994e] | 1143 | if( /*func == (fptr_t)pwritev2 || */ |
---|
| 1144 | func == (fptr_t)cfa_pwritev2 ) |
---|
| 1145 | #define _CFA_IO_FEATURE_IORING_OP_WRITEV , |
---|
| 1146 | return IS_DEFINED(IORING_OP_WRITEV); |
---|
| 1147 | #endif |
---|
[2d8f7b0] | 1148 | |
---|
[171ca0d] | 1149 | if( /*func == (fptr_t)fsync || */ |
---|
| 1150 | func == (fptr_t)cfa_fsync ) |
---|
| 1151 | #define _CFA_IO_FEATURE_IORING_OP_FSYNC , |
---|
| 1152 | return IS_DEFINED(IORING_OP_FSYNC); |
---|
[2d8f7b0] | 1153 | |
---|
| 1154 | if( /*func == (fptr_t)ync_file_range || */ |
---|
[ecf6b46] | 1155 | func == (fptr_t)cfa_sync_file_range ) |
---|
[2d8f7b0] | 1156 | #define _CFA_IO_FEATURE_IORING_OP_SYNC_FILE_RANGE , |
---|
| 1157 | return IS_DEFINED(IORING_OP_SYNC_FILE_RANGE); |
---|
| 1158 | |
---|
| 1159 | if( /*func == (fptr_t)sendmsg || */ |
---|
[ecf6b46] | 1160 | func == (fptr_t)cfa_sendmsg ) |
---|
[2d8f7b0] | 1161 | #define _CFA_IO_FEATURE_IORING_OP_SENDMSG , |
---|
| 1162 | return IS_DEFINED(IORING_OP_SENDMSG); |
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| 1163 | |
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| 1164 | if( /*func == (fptr_t)recvmsg || */ |
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[ecf6b46] | 1165 | func == (fptr_t)cfa_recvmsg ) |
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[2d8f7b0] | 1166 | #define _CFA_IO_FEATURE_IORING_OP_RECVMSG , |
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| 1167 | return IS_DEFINED(IORING_OP_RECVMSG); |
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| 1168 | |
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| 1169 | if( /*func == (fptr_t)send || */ |
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[2489d31] | 1170 | func == (fptr_t)cfa_send ) |
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[2d8f7b0] | 1171 | #define _CFA_IO_FEATURE_IORING_OP_SEND , |
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| 1172 | return IS_DEFINED(IORING_OP_SEND); |
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| 1173 | |
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| 1174 | if( /*func == (fptr_t)recv || */ |
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[2489d31] | 1175 | func == (fptr_t)cfa_recv ) |
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[2d8f7b0] | 1176 | #define _CFA_IO_FEATURE_IORING_OP_RECV , |
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| 1177 | return IS_DEFINED(IORING_OP_RECV); |
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| 1178 | |
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| 1179 | if( /*func == (fptr_t)accept4 || */ |
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[2489d31] | 1180 | func == (fptr_t)cfa_accept4 ) |
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[2d8f7b0] | 1181 | #define _CFA_IO_FEATURE_IORING_OP_ACCEPT , |
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| 1182 | return IS_DEFINED(IORING_OP_ACCEPT); |
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| 1183 | |
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| 1184 | if( /*func == (fptr_t)connect || */ |
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[2489d31] | 1185 | func == (fptr_t)cfa_connect ) |
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[2d8f7b0] | 1186 | #define _CFA_IO_FEATURE_IORING_OP_CONNECT , |
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| 1187 | return IS_DEFINED(IORING_OP_CONNECT); |
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| 1188 | |
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| 1189 | if( /*func == (fptr_t)fallocate || */ |
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[2489d31] | 1190 | func == (fptr_t)cfa_fallocate ) |
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[2d8f7b0] | 1191 | #define _CFA_IO_FEATURE_IORING_OP_FALLOCATE , |
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| 1192 | return IS_DEFINED(IORING_OP_FALLOCATE); |
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| 1193 | |
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[0ea6c5a] | 1194 | if( /*func == (fptr_t)posix_fadvise || */ |
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[2489d31] | 1195 | func == (fptr_t)cfa_fadvise ) |
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[2d8f7b0] | 1196 | #define _CFA_IO_FEATURE_IORING_OP_FADVISE , |
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| 1197 | return IS_DEFINED(IORING_OP_FADVISE); |
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| 1198 | |
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| 1199 | if( /*func == (fptr_t)madvise || */ |
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[2489d31] | 1200 | func == (fptr_t)cfa_madvise ) |
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[2d8f7b0] | 1201 | #define _CFA_IO_FEATURE_IORING_OP_MADVISE , |
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| 1202 | return IS_DEFINED(IORING_OP_MADVISE); |
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| 1203 | |
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| 1204 | if( /*func == (fptr_t)openat || */ |
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[2489d31] | 1205 | func == (fptr_t)cfa_openat ) |
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[2d8f7b0] | 1206 | #define _CFA_IO_FEATURE_IORING_OP_OPENAT , |
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| 1207 | return IS_DEFINED(IORING_OP_OPENAT); |
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| 1208 | |
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| 1209 | if( /*func == (fptr_t)close || */ |
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[2489d31] | 1210 | func == (fptr_t)cfa_close ) |
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[2d8f7b0] | 1211 | #define _CFA_IO_FEATURE_IORING_OP_CLOSE , |
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| 1212 | return IS_DEFINED(IORING_OP_CLOSE); |
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| 1213 | |
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| 1214 | if( /*func == (fptr_t)read || */ |
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[ecf6b46] | 1215 | func == (fptr_t)cfa_read ) |
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[2d8f7b0] | 1216 | #define _CFA_IO_FEATURE_IORING_OP_READ , |
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| 1217 | return IS_DEFINED(IORING_OP_READ); |
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| 1218 | |
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| 1219 | if( /*func == (fptr_t)write || */ |
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[ecf6b46] | 1220 | func == (fptr_t)cfa_write ) |
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[2d8f7b0] | 1221 | #define _CFA_IO_FEATURE_IORING_OP_WRITE , |
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| 1222 | return IS_DEFINED(IORING_OP_WRITE); |
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[ecf6b46] | 1223 | #endif |
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[2d8f7b0] | 1224 | |
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[ecf6b46] | 1225 | return false; |
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| 1226 | } |
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