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rcutorture: Set rcuperf writer kthreads to real-time priority

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This commit forces more deterministic update-side behavior by setting
rcuperf's rcu_perf_writer() kthreads to real-time priority.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2016-01-12 15:17:21 -08:00
parent 6b558c4c7a
commit 2094c99558
1 changed files with 3 additions and 0 deletions
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3
kernel/rcu/rcuperf.c
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@ -355,6 +355,7 @@ rcu_perf_writer(void *arg)
int i = 0; int i = 0;
int i_max; int i_max;
long me = (long)arg; long me = (long)arg;
struct sched_param sp;
bool started = false, done = false, alldone = false; bool started = false, done = false, alldone = false;
u64 t; u64 t;
u64 *wdp; u64 *wdp;
@ -365,6 +366,8 @@ rcu_perf_writer(void *arg)
WARN_ON(rcu_gp_is_normal() && gp_exp); WARN_ON(rcu_gp_is_normal() && gp_exp);
WARN_ON(!wdpp); WARN_ON(!wdpp);
set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids)); set_cpus_allowed_ptr(current, cpumask_of(me % nr_cpu_ids));
sp.sched_priority = 1;
sched_setscheduler_nocheck(current, SCHED_FIFO, &sp);
t = ktime_get_mono_fast_ns(); t = ktime_get_mono_fast_ns();
if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) { if (atomic_inc_return(&n_rcu_perf_writer_started) >= nrealwriters) {
t_rcu_perf_writer_started = t; t_rcu_perf_writer_started = t;