0fb298cf95
Block a bunch of threads on a futex and requeue them on another, N at a time. This program is particularly useful to measure the latency of nthread requeues without waking up any tasks -- thus mimicking a regular futex_wait. An example run: $ perf bench futex requeue -r 100 -t 64 Run summary [PID 151011]: Requeuing 64 threads (from 0x7d15c4 to 0x7d15c8), 1 at a time. [Run 1]: Requeued 64 of 64 threads in 0.0400 ms [Run 2]: Requeued 64 of 64 threads in 0.0390 ms [Run 3]: Requeued 64 of 64 threads in 0.0400 ms ... [Run 100]: Requeued 64 of 64 threads in 0.0390 ms Requeued 64 of 64 threads in 0.0399 ms (+-0.37%) Signed-off-by: Davidlohr Bueso <davidlohr@hp.com> Acked-by: Darren Hart <dvhart@linux.intel.com> Cc: Aswin Chandramouleeswaran <aswin@hp.com> Cc: Darren Hart <dvhart@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jason Low <jason.low2@hp.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <Waiman.Long@hp.com> Link: http://lkml.kernel.org/r/1387081917-9102-4-git-send-email-davidlohr@hp.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
#ifndef BENCH_H
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#define BENCH_H
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/*
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* The madvise transparent hugepage constants were added in glibc
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* 2.13. For compatibility with older versions of glibc, define these
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* tokens if they are not already defined.
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*
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* PA-RISC uses different madvise values from other architectures and
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* needs to be special-cased.
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*/
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#ifdef __hppa__
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# ifndef MADV_HUGEPAGE
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# define MADV_HUGEPAGE 67
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# endif
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# ifndef MADV_NOHUGEPAGE
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# define MADV_NOHUGEPAGE 68
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# endif
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#else
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# ifndef MADV_HUGEPAGE
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# define MADV_HUGEPAGE 14
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# endif
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# ifndef MADV_NOHUGEPAGE
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# define MADV_NOHUGEPAGE 15
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# endif
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#endif
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extern int bench_numa(int argc, const char **argv, const char *prefix);
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extern int bench_sched_messaging(int argc, const char **argv, const char *prefix);
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extern int bench_sched_pipe(int argc, const char **argv, const char *prefix);
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extern int bench_mem_memcpy(int argc, const char **argv,
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const char *prefix __maybe_unused);
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extern int bench_mem_memset(int argc, const char **argv, const char *prefix);
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extern int bench_futex_hash(int argc, const char **argv, const char *prefix);
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extern int bench_futex_wake(int argc, const char **argv, const char *prefix);
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extern int bench_futex_requeue(int argc, const char **argv, const char *prefix);
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#define BENCH_FORMAT_DEFAULT_STR "default"
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#define BENCH_FORMAT_DEFAULT 0
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#define BENCH_FORMAT_SIMPLE_STR "simple"
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#define BENCH_FORMAT_SIMPLE 1
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#define BENCH_FORMAT_UNKNOWN -1
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extern int bench_format;
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#endif
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