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sched: Add support to spread tasks

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If sysctl_sched_prefer_spread is enabled, then tasks would be freely
migrated to idle cpus within same cluster to reduce runnables.

By default, the feature is disabled.
User can trigger feature with:
   echo 1 > /proc/sys/kernel/sched_prefer_spread
	Aggressively spread tasks with in little cluster.
   echo 2 > /proc/sys/kernel/sched_prefer_spread
	Aggressively spread tasks with in little cluster as well as
	big cluster, but not between big and little.

Change-Id: I0a4d87bd17de3525548765472e6f388a9970f13c
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>
[satyap@codeaurora.org: fix trivial merge conflicts]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
This commit is contained in:
Lingutla Chandrasekhar 2020-01-08 10:30:04 +05:30 • committed by Satya Durga Srinivasu Prabhala
commit 50a9295169
4 changed files with 108 additions and 27 deletions
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9
kernel/sysctl.c
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@ -583,6 +583,15 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = sched_updown_migrate_handler,
},
{
.procname = "sched_prefer_spread",
.data = &sysctl_sched_prefer_spread,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = &two,
},
#endif
#ifdef CONFIG_SCHED_DEBUG
{