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052b0f6eaf
linux/tools/perf/bench
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Davidlohr Bueso 052b0f6eaf perf bench futex: Fix hung wakeup tasks after requeueing 
The futex-requeue benchmark can hang because of missing wakeups once the
benchmark is done, ie:

[Run 1]: Requeued 1024 of 1024 threads in 0.3290 ms
perf: couldn't wakeup all tasks (135/1024)

This bug, while perhaps suggesting missing wakeups in kernel futex code,
is merely a consequence of the crappy FUTEX_CMP_REQUEUE man page,
incorrectly mentioning that the number of requeued tasks is in fact
returned, not the wakeups.

This patch acknowledges this and updates the corresponding futex_wake
code around it.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Mel Gorman <mgorman@suse.de>
Link: http://lkml.kernel.org/r/1429894848.10273.44.camel@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2015-04-27 13:57:49 -03:00
..
bench.h perf bench: Add --repeat option 2014-06-19 16:13:15 -03:00
Build perf build: Add bench objects building 2015-02-12 11:32:32 -03:00
futex-hash.c perf bench futex: Support operations for shared futexes 2014-09-29 15:43:21 -03:00
futex-requeue.c perf bench futex: Fix hung wakeup tasks after requeueing 2015-04-27 13:57:49 -03:00
futex-wake.c perf bench futex: Support operations for shared futexes 2014-09-29 15:43:21 -03:00
futex.h perf tools: Provide stub for missing pthread_attr_setaffinity_np 2015-01-28 12:43:32 -03:00
mem-memcpy-arch.h tools/perf: Standardize feature support define names to: HAVE_{FEATURE}_SUPPORT 2013-10-09 08:48:28 +02:00
mem-memcpy-x86-64-asm-def.h
mem-memcpy-x86-64-asm.S Merge branch 'perf/urgent' into perf/core 2012-02-06 19:11:02 -02:00
mem-memcpy.c perf bench: Fix order of arguments to memcpy_alloc_mem 2015-02-22 23:10:56 -03:00
mem-memset-arch.h tools/perf: Standardize feature support define names to: HAVE_{FEATURE}_SUPPORT 2013-10-09 08:48:28 +02:00
mem-memset-x86-64-asm-def.h perf bench: Also allow measuring memset() 2012-01-24 20:25:32 -02:00
mem-memset-x86-64-asm.S perf tool: Fix perf stack to non executable on x86_64 2012-02-06 19:14:17 -02:00
numa.c Merge branch 'perf-core-for-mingo' into perf/urgent 2014-04-14 16:45:39 +02:00
sched-messaging.c perf tools: Don't include sys/poll.h directly 2014-09-17 17:08:09 -03:00
sched-pipe.c perf tools: Avoid build splat for syscall numbers with uclibc 2015-01-16 17:49:29 -03:00