Changeset 41870a5 for doc/theses/thierry_delisle_PhD/thesis/text/io.tex

Timestamp:

Feb 25, 2022, 6:20:22 PM (2 years ago)

Author:

Peter A. Buhr <pabuhr@…>

Branches:

ADT, ast-experimental, enum, master, pthread-emulation, qualifiedEnum

Children:

05ffb7b

Parents:

afe9e45 (diff), c5af4f9 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge branch 'master' of plg.uwaterloo.ca:software/cfa/cfa-cc

File:

• doc/theses/thierry_delisle_PhD/thesis/text/io.tex (modified) (3 diffs)

doc/theses/thierry_delisle_PhD/thesis/text/io.tex

@@ -1 +1 @@
 \chapter{User Level \io}
 As mentioned in Section~\ref{prev:io}, User-Level \io requires multiplexing the \io operations of many \glspl{thrd} onto fewer \glspl{proc} using asynchronous \io operations.
-Different operating systems offer various forms of asynchronous operations and as mentioned in Chapter~\ref{intro}, this work is exclusively focused on the Linux operating-system.
+Different operating systems offer various forms of asynchronous operations and, as mentioned in Chapter~\ref{intro}, this work is exclusively focused on the Linux operating-system.
 
 \section{Kernel Interface}
@@ -178 +178 @@
 Since completions are sent to the instance where requests were submitted, all instances with pending operations must be polled continously
 \footnote{As will be described in Chapter~\ref{practice}, this does not translate into constant cpu usage.}.
+Note that once an operation completes, there is nothing that ties it to the @io_uring@ instance that handled it.
+There is nothing preventing a new operation with, for example, the same file descriptors to a different @io_uring@ instance.
 
 A complicating aspect of submission is @io_uring@'s support for chains of operations, where the completion of an operation triggers the submission of the next operation on the link.
@@ -240 +242 @@
 To remove this requirement, a \gls{thrd} would need the ability to ``yield to a specific \gls{proc}'', \ie, park with the promise that it will be run next on a specific \gls{proc}, the \gls{proc} attached to the correct ring.}
 , greatly simplifying both allocation and submission.
-In this design, allocation and submission form a ring partitionned ring buffer as shown in Figure~\ref{fig:pring}.
+In this design, allocation and submission form a partitionned ring buffer as shown in Figure~\ref{fig:pring}.
 Once added to the ring buffer, the attached \gls{proc} has a significant amount of flexibility with regards to when to do the system call.
-Possible options are: when the \gls{proc} runs out of \glspl{thrd} to run, after running a given number of threads \glspl{thrd}, etc.
+Possible options are: when the \gls{proc} runs out of \glspl{thrd} to run, after running a given number of \glspl{thrd}, etc.
 
 \begin{figure}