android_kernel_xiaomi_sm8350/kernel/time
Ingo Molnar e4e4e534fa sched clock: revert various sched_clock() changes
Found an interactivity problem on a quad core test-system - simple
CPU loops would occasionally delay the system un an unacceptable way.

After much debugging with Peter Zijlstra it turned out that the problem
is caused by the string of sched_clock() changes - they caused the CPU
clock to jump backwards a bit - which confuses the scheduler arithmetics.

(which is unsigned for performance reasons)

So revert:

 # c300ba2: sched_clock: and multiplier for TSC to gtod drift
 # c0c8773: sched_clock: only update deltas with local reads.
 # af52a90: sched_clock: stop maximum check on NO HZ
 # f7cce27: sched_clock: widen the max and min time

This solves the interactivity problems.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Mike Galbraith <efault@gmx.de>
2008-07-31 17:20:29 +02:00
..
clockevents.c
clocksource.c Merge branch 'cpus4096-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-07-23 18:37:44 -07:00
jiffies.c
Kconfig
Makefile
ntp.c
tick-broadcast.c Merge branch 'linus' into cpus4096 2008-07-16 00:29:07 +02:00
tick-common.c cpumask: change cpumask_of_cpu_ptr to use new cpumask_of_cpu 2008-07-26 16:40:33 +02:00
tick-internal.h
tick-oneshot.c
tick-sched.c sched clock: revert various sched_clock() changes 2008-07-31 17:20:29 +02:00
timekeeping.c
timer_list.c
timer_stats.c