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init: apply SCHED_FIFO to kthreadd 

Hotplug (cpu_up) latency currently suffers because the system
must wait for kthreadd to spawn certain kthreads (such as the
migration and workqueue kthreads) and for them to run for
the first time. Setting SCHED_FIFO will cause kthreadd to run
immediately. The newly created kthreads will inherit the scheduler
policy and run immediately also.

The scheduling policy of newly created kthreads is already set
back to SCHED_NORMAL in kthread_create_on_node, so nothing needs
to be done to restore normal scheduling behavior for the kthreads
once spawned.

Change-Id: I236ceb29845cf58ea1ea886fc3210ccaab2dd792
Signed-off-by: Steve Muckle <smuckle@codeaurora.org>
(cherry picked from commit 82440737eef236077e5781061b4c8de2c0b013fb)
This commit is contained in:
Steve Muckle 2012-02-28 17:39:31 -08:00 committed by Stephen Boyd
parent c21af268b8
commit eb1dcb8267
1 changed files with 2 additions and 0 deletions
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init/main.c
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@ -364,6 +364,7 @@ static __initdata DECLARE_COMPLETION(kthreadd_done);
static noinline void __init_refok rest_init(void)
{
int pid;
const struct sched_param param = { .sched_priority = 1 };
rcu_scheduler_starting();
/*
@ -377,6 +378,7 @@ static noinline void __init_refok rest_init(void)
rcu_read_lock();
kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
rcu_read_unlock();
sched_setscheduler_nocheck(kthreadd_task, SCHED_FIFO, &param);
complete(&kthreadd_done);
/*