A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 03:01:39 -04:00
Code Issues Projects Releases Packages Wiki Activity

cpuidle: fix 100% C0 statistics regression

Browse source 
commit 9b12e18cdc
'ACPI: cpuidle: Support C1 idle time accounting'
was implicated in a 100% C0 idle regression.
http://bugzilla.kernel.org/show_bug.cgi?id=10076

It pointed out a potential problem where the menu governor
may get confused by the C-state residency time from poll
idle or C1 idle, where this timing info is not accurate.
This inaccuracy is due to interrupts being handled
before we account for C-state exit.

Do not mark TIME_VALID for CO poll state.
Mark C1 time as valid only with the MWAIT (CSTATE_FFH) entry method.

This makes governors use the timing information only when it is correct and
eliminates any wrong policy decisions that may result from invalid timing
information.

Signed-off-by: Venkatesh Pallipadi <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Venki Pallipadi 2008-02-29 10:24:32 -08:00 • committed by Len Brown
commit 8e92b6605d
2 changed files with 4 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

2
drivers/cpuidle/cpuidle.c
View file

@ -224,7 +224,7 @@ static void poll_idle_init(struct cpuidle_device *dev)
state->exit_latency = 0;
state->target_residency = 0;
state->power_usage = -1;
state->flags = CPUIDLE_FLAG_POLL | CPUIDLE_FLAG_TIME_VALID;
state->flags = CPUIDLE_FLAG_POLL;
state->enter = poll_idle;
}
#else