Index: libcfa/src/concurrency/stats.cfa
===================================================================
--- libcfa/src/concurrency/stats.cfa	(revision 261e107b40e5f345760c2815edd2bbad73ca50db)
+++ libcfa/src/concurrency/stats.cfa	(revision 70cd431b44bad0ac62163070c10ceb78953780db)
@@ -48,5 +48,7 @@
 			stats->io.submit.eagr       = 0;
 			stats->io.submit.nblk       = 0;
+			stats->io.submit.extr       = 0;
 			stats->io.flush.external    = 0;
+			stats->io.flush.signal      = 0;
 			stats->io.flush.dirty       = 0;
 			stats->io.flush.full        = 0;
@@ -120,5 +122,7 @@
 			tally_one( &cltr->io.submit.eagr      , &proc->io.submit.eagr       );
 			tally_one( &cltr->io.submit.nblk      , &proc->io.submit.nblk       );
+			tally_one( &cltr->io.submit.extr      , &proc->io.submit.extr       );
 			tally_one( &cltr->io.flush.external   , &proc->io.flush.external    );
+			tally_one( &cltr->io.flush.signal     , &proc->io.flush.signal      );
 			tally_one( &cltr->io.flush.dirty      , &proc->io.flush.dirty       );
 			tally_one( &cltr->io.flush.full       , &proc->io.flush.full        );
@@ -199,5 +203,5 @@
 				if(io.alloc.slow) {
 					double avgfasts = (100.0 * (double)io.submit.fast) / total_submits;
-					sstr | "fast," | eng3(io.submit.slow) | "slow (" | ws(3, 3, avgfasts) | "%)" | nonl;
+					sstr | "fast," | eng3(io.submit.slow) | "slow (" | ws(3, 3, avgfasts) | "%)," | eng3(io.submit.extr) | "external" | nonl;
 				}
 				sstr | " - eager" | eng3(io.submit.eagr) | nonl;
@@ -217,5 +221,5 @@
 				     | " - cmp " | eng3(io.calls.locked) | "locked, " | eng3(io.calls.helped) | "helped"
 				     | " - " | eng3(io.calls.errors.busy) | " EBUSY";
-				sstr | " - sub: " | eng3(io.flush.full) | "full, " | eng3(io.flush.dirty) | "drty, " | eng3(io.flush.idle) | "idle, " | eng3(io.flush.eager) | "eagr, " | eng3(io.flush.external) | "ext";
+				sstr | " - sub: " | eng3(io.flush.full) | "full, " | eng3(io.flush.dirty) | "drty, " | eng3(io.flush.idle) | "idle, " | eng3(io.flush.eager) | "eagr, " | eng3(io.flush.external) | '/' | eng3(io.flush.signal) | "ext";
 				sstr | "- ops blk: "
 				     |   " sk rd: " | eng3(io.ops.sockread)  | "epll: " | eng3(io.ops.epllread)
Index: libcfa/src/concurrency/stats.hfa
===================================================================
--- libcfa/src/concurrency/stats.hfa	(revision 261e107b40e5f345760c2815edd2bbad73ca50db)
+++ libcfa/src/concurrency/stats.hfa	(revision 70cd431b44bad0ac62163070c10ceb78953780db)
@@ -94,7 +94,9 @@
 				volatile uint64_t eagr;
 				volatile uint64_t nblk;
+				volatile uint64_t extr;
 			} submit;
 			struct {
 				volatile uint64_t external;
+				volatile uint64_t signal;
 				volatile uint64_t dirty;
 				volatile uint64_t full;