From a4a4fdd978a8e2fc71b2c8f22db3d2cb3eff1edd Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Thu, 1 Aug 2019 12:41:31 +0200 Subject: [PATCH] sched/psi: Reduce psimon FIFO priority commit 14f5c7b46a41a595fc61db37f55721714729e59e upstream. PSI defaults to a FIFO-99 thread, reduce this to FIFO-1. FIFO-99 is the very highest priority available to SCHED_FIFO and it not a suitable default; it would indicate the psi work is the most important work on the machine. Since Real-Time tasks will have pre-allocated memory and locked it in place, Real-Time tasks do not care about PSI. All it needs is to be above OTHER. Signed-off-by: Peter Zijlstra (Intel) Acked-by: Johannes Weiner Tested-by: Suren Baghdasaryan Cc: Thomas Gleixner Signed-off-by: Joseph Qi Acked-by: Caspar Zhang --- kernel/sched/psi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c index 42890e19b3de..1f2fbbe31d72 100644 --- a/kernel/sched/psi.c +++ b/kernel/sched/psi.c @@ -1051,7 +1051,7 @@ struct psi_trigger *psi_trigger_create(struct psi_group *group, if (!rcu_access_pointer(group->poll_kworker)) { struct sched_param param = { - .sched_priority = MAX_RT_PRIO - 1, + .sched_priority = 1, }; struct kthread_worker *kworker; -- GitLab