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| author | Rohit Gupta <rohgup@codeaurora.org> | 2014-03-13 20:54:47 -0700 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-23 19:58:52 -0700 |
| commit | e3fe80da05042802fc16f828919dfe3621a34d96 (patch) | |
| tree | d72c15df97a2e897b5b5491edad0eedb8a91b570 /kernel/sched | |
| parent | 624f7a0869b094a684ca165b4183f2c2c09d32a9 (diff) | |
sched: Call the notify_on_migrate notifier chain for wakeups as well
Add a change to send notify_on_migrate hints on wakeups of
foreground tasks from scheduler if their load is above
wakeup_load_thresholds (default value is 60).
These hints can be used to choose an appropriate CPU frequency
corresponding to the load of the task being woken up.
By default sched_wakeup_load_threshold is set to 60 and therefore
wakeup hints are sent out for those tasks whose loads are higher
that value. This might cause unnecessary wakeup boosts to happen
when load based syncing is turned ON for cpu-boost.
Disable the wake up hints by setting the sched_wakeup_load_threshold
to a value higher than 100 so that wakeup boost doesnt happen unless
it is explicitly turned ON from adb shell.
Change-Id: Ieca413c1a8bd2b14a15a7591e8e15d22925c42ca
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>
[rameezmustafa@codeaurora.org: Squash "a26fcce sched: Disable wakeup
hints for foreground tasks by default" into
this patch and update commit text.]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 1d71f326bc4e..b1d48c53bf7e 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2058,6 +2058,7 @@ static void ttwu_queue(struct task_struct *p, int cpu) raw_spin_unlock(&rq->lock); } +__read_mostly unsigned int sysctl_sched_wakeup_load_threshold = 110; /** * try_to_wake_up - wake up a thread * @p: the thread to be awakened @@ -2156,7 +2157,7 @@ stat: out: raw_spin_unlock_irqrestore(&p->pi_lock, flags); - if (src_cpu != cpu && task_notify_on_migrate(p)) { + if (task_notify_on_migrate(p)) { struct migration_notify_data mnd; mnd.src_cpu = src_cpu; @@ -2166,7 +2167,16 @@ out: (u64)(sysctl_sched_ravg_window)); else mnd.load = 0; - atomic_notifier_call_chain(&migration_notifier_head, + /* + * Call the migration notifier with mnd for foreground task + * migrations as well as for wakeups if their load is above + * sysctl_sched_wakeup_load_threshold. This would prompt the + * cpu-boost to boost the CPU frequency on wake up of a heavy + * weight foreground task + */ + if ((src_cpu != cpu) || (mnd.load > + sysctl_sched_wakeup_load_threshold)) + atomic_notifier_call_chain(&migration_notifier_head, 0, (void *)&mnd); } return success; |