Vikram Mulukutla 44310bf8ab sched: walt: Correct WALT window size initialization ...

It is preferable that WALT window rollover occurs just
before a tick, since the tick is an opportune moment
to record a complete window's statistics, as well as report
those stats to the cpu frequency governor. When CONFIG_HZ
results in a TICK_NSEC that isn't a integral number, this
requirement may be violated. Account for this by reducing
the WALT window size to the nearest multiple of TICK_NSEC.

Commit d368c6faa1 ("sched: walt: fix window misalignment
when HZ=300") attempted to do this but WALT isn't using
MIN_SCHED_RAVG_WINDOW as the window size and the patch was
doing nothing.

Also, change the type of 'walt_disabled' to bool and warn
if an invalid window size causes WALT to be disabled.

Change-Id: Ie3dcfc21a3df4408254ca1165a355bbe391ed5c7
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
(cherry picked from commit e79f447a97)
Signed-off-by: Quentin Perret <quentin.perret@arm.com>

2017-12-01 16:11:15 +00:00

..

events

sched: walt: Correct WALT window size initialization

2017-12-01 16:11:15 +00:00

define_trace.h

tracing: Introduce TRACE_EVENT_FN_COND macro

2015-12-23 14:27:21 -05:00

perf.h

tracing: Use outer () on __get_str() definition

2016-07-15 15:50:58 -04:00

syscall.h

tracing: Rename ftrace_event_{call,class} to trace_event_{call,class}

2015-05-13 14:06:10 -04:00

trace_events.h

tracing: Use outer () on __get_str() definition

2016-07-15 15:50:58 -04:00