From 6b558c4c7a4ba410e39dbcb9d4c2b6e928c09308 Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Tue, 12 Jan 2016 14:15:40 -0800 Subject: rcutorture: Bind rcuperf reader/writer kthreads to CPUs This commit forces more deterministic behavior by binding rcuperf's rcu_perf_reader() and rcu_perf_writer() kthreads to their respective CPUs. Signed-off-by: Paul E. McKenney --- kernel/rcu/rcuperf.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'kernel/rcu/rcuperf.c') diff --git a/kernel/rcu/rcuperf.c b/kernel/rcu/rcuperf.c index 9d54a57bee7d..7a1edf417d18 100644 --- a/kernel/rcu/rcuperf.c +++ b/kernel/rcu/rcuperf.c @@ -328,8 +328,10 @@ rcu_perf_reader(void *arg) { unsigned long flags; int idx; + long me = (long)arg; VERBOSE_PERFOUT_STRING("rcu_perf_reader task started"); + set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); set_user_nice(current, MAX_NICE); atomic_inc(&n_rcu_perf_reader_started); @@ -362,6 +364,7 @@ rcu_perf_writer(void *arg) WARN_ON(rcu_gp_is_expedited() && !rcu_gp_is_normal() && !gp_exp); WARN_ON(rcu_gp_is_normal() && gp_exp); WARN_ON(!wdpp); + set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); t = ktime_get_mono_fast_ns(); if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) { t_rcu_perf_writer_started = t; @@ -594,7 +597,7 @@ rcu_perf_init(void) goto unwind; } for (i = 0; i < nrealreaders; i++) { - firsterr = torture_create_kthread(rcu_perf_reader, NULL, + firsterr = torture_create_kthread(rcu_perf_reader, (void *)i, reader_tasks[i]); if (firsterr) goto unwind; -- cgit