tree 6f9a33004c91eb8e68998e7b42522d30c36fc326
parent 601ebbd834d52593bc8a5ab0ea39e5b7e1e65009
author Pavankumar Kondeti <pkondeti@codeaurora.org> 1473143368 +0530
committer Syed Rameez Mustafa <rameezmustafa@codeaurora.org> 1486507840 -0800

sched: add a knob to prefer the waker CPU for sync wakeups

The current policy has a preference to select an idle CPU in the waker
cluster compared to the waker CPU running only 1 task. By selecting
an idle CPU, it eliminates the chance of waker migrating to a
different CPU after the wakee preempts it. This policy is also not
susceptible to the incorrect "sync" usage i.e the waker does not
goto sleep after waking up the wakee.

However LPM exit latency associated with an idle CPU outweigh the
above benefits on some targets. So add a knob to prefer the waker
CPU having only 1 runnable task over idle CPUs in the waker cluster.

Change-Id: Id974748c07625c1b19112235f426a5d204dfdb33
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>