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Date: Mon, 22 Jun 2020 17:29:51 -0700 From: paulmck@...nel.org To: rcu@...r.kernel.org Cc: linux-kernel@...r.kernel.org, kernel-team@...com, mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com, josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org, "Paul E. McKenney" <paulmck@...nel.org> Subject: [PATCH tip/core/rcu 08/30] refperf: Convert nreaders to a module parameter From: "Paul E. McKenney" <paulmck@...nel.org> This commit converts nreaders to a module parameter, with the default of -1 specifying the old behavior of using 75% of the readers. Cc: Joel Fernandes (Google) <joel@...lfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@...nel.org> --- kernel/rcu/refperf.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/kernel/rcu/refperf.c b/kernel/rcu/refperf.c index e991d48..020e55a 100644 --- a/kernel/rcu/refperf.c +++ b/kernel/rcu/refperf.c @@ -62,6 +62,12 @@ torture_param(int, holdoff, IS_BUILTIN(CONFIG_RCU_REF_PERF_TEST) ? 10 : 0, "Holdoff time before test start (s)"); // Number of loops per experiment, all readers execute operations concurrently. torture_param(long, loops, 10000000, "Number of loops per experiment."); +// Number of readers, with -1 defaulting to about 75% of the CPUs. +torture_param(int, nreaders, -1, "Number of readers, -1 for 75% of CPUs."); +// Number of runs. +torture_param(int, nruns, 30, "Number of experiments to run."); +// Reader delay in nanoseconds, 0 for no delay. +torture_param(int, readdelay, 0, "Read-side delay in nanoseconds."); #ifdef MODULE # define REFPERF_SHUTDOWN 0 @@ -93,7 +99,6 @@ static wait_queue_head_t main_wq; static int shutdown_start; static struct reader_task *reader_tasks; -static int nreaders; // Number of readers that are part of the current experiment. static atomic_t nreaders_exp; @@ -411,8 +416,8 @@ static void ref_perf_print_module_parms(struct ref_perf_ops *cur_ops, const char *tag) { pr_alert("%s" PERF_FLAG - "--- %s: verbose=%d shutdown=%d holdoff=%d loops=%ld\n", perf_type, tag, - verbose, shutdown, holdoff, loops); + "--- %s: verbose=%d shutdown=%d holdoff=%d loops=%ld nreaders=%d\n", perf_type, tag, + verbose, shutdown, holdoff, loops, nreaders); } static void @@ -501,8 +506,9 @@ ref_perf_init(void) schedule_timeout_uninterruptible(1); } - // Reader tasks (~75% of online CPUs). - nreaders = (num_online_cpus() >> 1) + (num_online_cpus() >> 2); + // Reader tasks (default to ~75% of online CPUs). + if (nreaders < 0) + nreaders = (num_online_cpus() >> 1) + (num_online_cpus() >> 2); reader_tasks = kcalloc(nreaders, sizeof(reader_tasks[0]), GFP_KERNEL); if (!reader_tasks) { -- 2.9.5
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