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| author |   Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-01-30 20:56:38 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2016-03-31 13:38:58 -0700 |
| commit | df37e66bfdbb57e8cae7dbf39a0c66b1b8701338 (patch) | |
| tree | 76c3d3915b98d79870a54593530aa029f77a976e /kernel/rcu/rcuperf.c | |
| parent | rcutorture: Make scripts analyze rcuperf trace data, if present (diff) | |
| download | linux-dev-df37e66bfdbb57e8cae7dbf39a0c66b1b8701338.tar.xz linux-dev-df37e66bfdbb57e8cae7dbf39a0c66b1b8701338.zip | |
rcutorture: Add rcuperf holdoff boot parameter to reduce interference
Boot-time activity can legitimately grab CPUs for extended time periods,
so the commit adds a boot parameter to delay the start of the performance
test until boot has completed. Defaults to 10 seconds.
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/rcu/rcuperf.c')
| -rw-r--r-- | kernel/rcu/rcuperf.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c index 12561f96f0a2..278600143bb6 100644 --- a/kernel/rcu/rcuperf.c +++ b/kernel/rcu/rcuperf.c @@ -59,6 +59,7 @@ MODULE_AUTHOR("Paul E. McKenney <paulmck@linux.vnet.ibm.com>"); do { if (verbose) pr_alert("%s" PERF_FLAG "!!! %s\n", perf_type, s); } while (0) torture_param(bool, gp_exp, true, "Use expedited GP wait primitives"); +torture_param(int, holdoff, 10, "Holdoff time before test start (s)"); torture_param(int, nreaders, -1, "Number of RCU reader threads"); torture_param(int, nwriters, -1, "Number of RCU updater threads"); torture_param(bool, shutdown, false, "Shutdown at end of performance tests."); @@ -368,6 +369,10 @@ rcu_perf_writer(void *arg) set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); sp.sched_priority = 1; sched_setscheduler_nocheck(current, SCHED_FIFO, &sp); + + if (holdoff) + schedule_timeout_uninterruptible(holdoff * HZ); + t = ktime_get_mono_fast_ns(); if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) { t_rcu_perf_writer_started = t; |