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author | 2021-08-08 21:32:58 -0700 | |
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committer | 2021-08-09 12:00:04 -0300 | |
commit | 9f9a3ffe94f263388b99cb75e4ec374e31aaeb0f (patch) | |
tree | bc35c452426a5763e94488dc91377a2683f4ef1b /tools/perf/bench/futex-lock-pi.c | |
parent | perf bench futex: Remove bogus backslash from comment (diff) | |
download | linux-dev-9f9a3ffe94f263388b99cb75e4ec374e31aaeb0f.tar.xz linux-dev-9f9a3ffe94f263388b99cb75e4ec374e31aaeb0f.zip |
perf bench futex: Add --mlockall parameter
This adds, across all futex benchmarks, the -m/--mlockall option
which is a common operation for realtime workloads by not incurring
in page faults in paths that want determinism. As such, threads
started after a call to mlockall(2) will generate page faults
immediately since the new stack is immediately forced to memory,
due to the MCL_FUTURE flag.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lore.kernel.org/lkml/20210809043301.66002-5-dave@stgolabs.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/bench/futex-lock-pi.c')
-rw-r--r-- | tools/perf/bench/futex-lock-pi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/tools/perf/bench/futex-lock-pi.c b/tools/perf/bench/futex-lock-pi.c index ce980df23bb0..5d1fe9c35807 100644 --- a/tools/perf/bench/futex-lock-pi.c +++ b/tools/perf/bench/futex-lock-pi.c @@ -21,6 +21,7 @@ #include <err.h> #include <stdlib.h> #include <sys/time.h> +#include <sys/mman.h> struct worker { int tid; @@ -48,6 +49,7 @@ static const struct option options[] = { OPT_BOOLEAN( 'M', "multi", ¶ms.multi, "Use multiple futexes"), OPT_BOOLEAN( 's', "silent", ¶ms.silent, "Silent mode: do not display data/details"), OPT_BOOLEAN( 'S', "shared", ¶ms.fshared, "Use shared futexes instead of private ones"), + OPT_BOOLEAN( 'm', "mlockall", ¶ms.mlockall, "Lock all current and future memory"), OPT_END() }; @@ -165,6 +167,11 @@ int bench_futex_lock_pi(int argc, const char **argv) act.sa_sigaction = toggle_done; sigaction(SIGINT, &act, NULL); + if (params.mlockall) { + if (mlockall(MCL_CURRENT | MCL_FUTURE)) + err(EXIT_FAILURE, "mlockall"); + } + if (!params.nthreads) params.nthreads = cpu->nr; |