diff options
| author | Srivatsa Vaddagiri <vatsa@codeaurora.org> | 2015-05-12 15:01:15 +0530 |
|---|---|---|
| committer | Kyle Yan <kyan@codeaurora.org> | 2016-05-26 15:28:59 -0700 |
| commit | e6aae1c3e01868f37df31e7542c3160fd194474f (patch) | |
| tree | 3042f0654c617d05884ecf9150dd511bad4cffe1 /kernel/sysctl.c | |
| parent | 450ba6dd70df79333e9949af731a6b40bfa37856 (diff) | |
sched: Aggregate for frequency
Related threads in a group could execute on different CPUs and hence
present a split-demand picture to cpufreq governor. IOW the governor
fails to see the net cpu demand of all related threads in a given
window if the threads's execution were to be split across CPUs. That
could result in sub-optimal frequency chosen in comparison to the
ideal frequency at which the aggregate work (taken up by related
threads) needs to be run.
This patch aggregates cpu execution stats in a window for all related
threads in a group. This helps present cpu busy time to governor as if
all related threads were part of the same thread and thus help select
the right frequency required by related threads. This aggregation
is done per-cluster.
Change-Id: I71e6047620066323721c6d542034ddd4b2950e7f
Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
[joonwoop@codeaurora.org: Fixed notify_migration() to hold rcu read
lock as this version of Linux doesn't hold p->pi_lock when the
function gets called while keeping use of rcu_access_pointer() since
we never dereference return value.]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 1da3b96368b1..825be75ca1a3 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -472,6 +472,13 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec_minmax, .extra1 = &zero, }, + { + .procname = "sched_freq_aggregate", + .data = &sysctl_sched_freq_aggregate, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = sched_window_update_handler, + }, #endif { .procname = "sched_boost", |