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sched/core: Use SCHED_RR in place of SCHED_FIFO for all users

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Although SCHED_FIFO is a real-time scheduling policy, it can have bad
results on system latency, since each SCHED_FIFO task will run to
completion before yielding to another task. This can result in visible
micro-stalls when a SCHED_FIFO task hogs the CPU for too long. On a
system where latency is favored over throughput, using SCHED_RR is a
better choice than SCHED_FIFO.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
Signed-off-by: Oktapra Amtono <oktapra.amtono@gmail.com>
Signed-off-by: CloudedQuartz <ravenklawasd@gmail.com>
This commit is contained in:
Sultan Alsawaf 2021-01-26 22:05:53 -08:00 • committed by Ksawlii
parent cda8f45b3b
commit 74cbd01416
1 changed files with 2 additions and 1 deletions
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kernel/sched/core.c
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@ -5442,7 +5442,8 @@ static void __setscheduler_params(struct task_struct *p,
if (policy == SETPARAM_POLICY) if (policy == SETPARAM_POLICY)
policy = p->policy; policy = p->policy;
p->policy = policy; /* Replace SCHED_FIFO with SCHED_RR to reduce latency */
p->policy = policy == SCHED_FIFO ? SCHED_RR : policy;
if (dl_policy(policy)) if (dl_policy(policy))
__setparam_dl(p, attr); __setparam_dl(p, attr);