diff options
| author | Rohit Gupta <rohgup@codeaurora.org> | 2014-03-14 18:56:14 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 19:58:46 -0700 |
| commit | 48056d2399dfc6aead29a8a10aa9fd5e93ed00be (patch) | |
| tree | 8cab98b2a7daebe602fb37572fde3b84f66462ce /kernel/sched/sched.h | |
| parent | 158eff54eaf77a47b86aff9fb96e7ab4819c7c06 (diff) | |
cpufreq: cpu-boost: Introduce scheduler assisted load based syncs
Previously, on getting a migration notification cpu-boost changed
the scaling min of the destination frequency to match that of the
source frequency or sync_threshold whichever was minimum.
If the scheduler migration notification is extended with task load
(cpu demand) information, the cpu boost driver can use this load to
compute a suitable frequency for the migrating task. The required
frequency for the task is calculated by taking the load percentage
of the max frequency and no sync is performed if the load is less
than a particular value (migration_load_threshold).This change is
beneficial for both perf and power as demand of a task is taken into
consideration while making cpufreq decisions and unnecessary syncs
for lightweight tasks are avoided.
The task load information provided by scheduler comes from a
window-based load collection mechanism which also normalizes the
load collected by the scheduler to the max possible frequency
across all CPUs.
Change-Id: Id2ba91cc4139c90602557f9b3801fb06b3c38992
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>
[rameezmustafa@codeaurora.org]: Port to msm-3.18]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
[joonwoop@codeaurora.org: fixed conflict in __migrate_task().]
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
Diffstat (limited to 'kernel/sched/sched.h')
| -rw-r--r-- | kernel/sched/sched.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 0dbe55192ef2..b85da1bb4b49 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -35,6 +35,7 @@ extern void update_cpu_load_active(struct rq *this_rq); static inline void update_cpu_load_active(struct rq *this_rq) { } #endif +extern unsigned int sysctl_sched_ravg_window; /* * Helpers for converting nanosecond timing to jiffy resolution */ |