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34b753007d
kernel_optimize_test/tools/perf/bench
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Sebastian Andrzej Siewior 34b753007d perf bench futex: Cache align the worker struct 
It popped up in perf testing that the worker consumes some amount of
CPU. It boils down to the increment of `ops` which causes cache line
bouncing between the individual threads.

This patch aligns the struct by 256 bytes to ensure that not a cache
line is shared among CPUs. 128 byte is the x86 worst case and grep says
that L1_CACHE_SHIFT is set to 8 on s390.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20161016190803.3392-1-bigeasy@linutronix.de
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-10-24 11:07:45 -03:00
..
bench.h perf tools: Remove needless 'extern' from function prototypes 2016-03-23 15:06:35 -03:00
Build perf bench: Rename 'mem-memcpy.c' => 'mem-functions.c' 2015-10-19 15:39:39 -03:00
futex-hash.c perf bench futex: Cache align the worker struct 2016-10-24 11:07:45 -03:00
futex-lock-pi.c perf bench futex: Add missing compiler.h header 2016-07-12 15:20:30 -03:00
futex-requeue.c perf bench futex: Use NSEC_PER_USEC 2016-08-23 15:37:33 -03:00
futex-wake-parallel.c perf bench futex: Use NSEC_PER_USEC 2016-08-23 15:37:33 -03:00
futex-wake.c perf bench futex: Use NSEC_PER_USEC 2016-08-23 15:37:33 -03:00
futex.h perf bench futex: Simplify wrapper for LOCK_PI 2016-04-25 20:24:26 -03:00
mem-functions.c perf bench mem: Move boilerplate memory allocation to the infrastructure 2016-10-24 11:07:43 -03:00
mem-memcpy-arch.h perf tools: Remove needless 'extern' from function prototypes 2016-03-23 15:06:35 -03:00
mem-memcpy-x86-64-asm-def.h perf/bench: Fix mem* routines usage after alternatives change 2015-03-03 18:01:10 +01:00
mem-memcpy-x86-64-asm.S perf bench: Copy kernel files needed to build mem{cpy,set} x86_64 benchmarks 2016-07-12 15:20:32 -03:00
mem-memset-arch.h perf tools: Remove needless 'extern' from function prototypes 2016-03-23 15:06:35 -03:00
mem-memset-x86-64-asm-def.h perf/bench: Fix mem* routines usage after alternatives change 2015-03-03 18:01:10 +01:00
mem-memset-x86-64-asm.S perf bench: Copy kernel files needed to build mem{cpy,set} x86_64 benchmarks 2016-07-12 15:20:32 -03:00
numa.c perf bench numa: Use NSEC_PER_U?SEC 2016-08-23 15:37:33 -03:00
sched-messaging.c perf bench sched-messaging: Use USEC_PER_MSEC 2016-08-23 15:37:33 -03:00
sched-pipe.c perf bench sched-pipe: Use linux/time64.h, USEC_PER_SEC 2016-08-23 15:37:33 -03:00