evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

cpufreq: interactive: Use del_timer/add_timer_on to rearm timers

Browse source 
Replace mod_timer_pinned() with del_timer(), add_timer_on().
mod_timer_pinned() always adds timer onto current CPU. Interactive
governor expects each CPU's timers to be running on the same CPU.
If cpufreq_interactive_timer_resched() is called from another CPU,
the timer will be armed on the wrong CPU.

Replacing mod_timer_pinned() with del_timer() and add_timer_on()
guarantees timers are still run on the right CPU even if another
CPU reschedules the timer. This would provide more flexibility
for future changes.

Change-Id: I3a10be37632afc0ea4e0cc9c86323b9783b216b1
[junjiew@codeaurora.org: Dropped changes that are no longer needed
 due to removal of relevant code]
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>
This commit is contained in:
Junjie Wu 2014-08-15 16:20:54 -07:00 • committed by David Keitel
parent bbe0d10d97
commit 3b48f85cd1
1 changed files with 11 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
drivers/cpufreq/cpufreq_interactive.c
View file

@ -155,9 +155,9 @@ static u64 round_to_nw_start(u64 jif,
return (jif + 1) * step;
}
static void cpufreq_interactive_timer_resched(
struct cpufreq_interactive_cpuinfo *pcpu)
static void cpufreq_interactive_timer_resched(unsigned long cpu)
{
struct cpufreq_interactive_cpuinfo *pcpu = &per_cpu(cpuinfo, cpu);
struct cpufreq_interactive_tunables *tunables =
pcpu->policy->governor_data;
u64 expires;
@ -171,12 +171,16 @@ static void cpufreq_interactive_timer_resched(
pcpu->cputime_speedadj = 0;
pcpu->cputime_speedadj_timestamp = pcpu->time_in_idle_timestamp;
expires = round_to_nw_start(pcpu->last_evaluated_jiffy, tunables);
mod_timer_pinned(&pcpu->cpu_timer, expires);
del_timer(&pcpu->cpu_timer);
pcpu->cpu_timer.expires = expires;
add_timer_on(&pcpu->cpu_timer, cpu);
if (tunables->timer_slack_val >= 0 &&
pcpu->target_freq > pcpu->policy->min) {
expires += usecs_to_jiffies(tunables->timer_slack_val);
mod_timer_pinned(&pcpu->cpu_slack_timer, expires);
del_timer(&pcpu->cpu_slack_timer);
pcpu->cpu_slack_timer.expires = expires;
add_timer_on(&pcpu->cpu_slack_timer, cpu);
}
spin_unlock_irqrestore(&pcpu->load_lock, flags);
@ -193,6 +197,7 @@ static void cpufreq_interactive_timer_start(
u64 expires = round_to_nw_start(pcpu->last_evaluated_jiffy, tunables);
unsigned long flags;
spin_lock_irqsave(&pcpu->load_lock, flags);
pcpu->cpu_timer.expires = expires;
add_timer_on(&pcpu->cpu_timer, cpu);
if (tunables->timer_slack_val >= 0 &&
@ -202,7 +207,6 @@ static void cpufreq_interactive_timer_start(
add_timer_on(&pcpu->cpu_slack_timer, cpu);
}
spin_lock_irqsave(&pcpu->load_lock, flags);
pcpu->time_in_idle =
get_cpu_idle_time(cpu, &pcpu->time_in_idle_timestamp,
tunables->io_is_busy);
@ -492,7 +496,7 @@ static void cpufreq_interactive_timer(unsigned long data)
rearm:
if (!timer_pending(&pcpu->cpu_timer))
cpufreq_interactive_timer_resched(pcpu);
cpufreq_interactive_timer_resched(data);
exit:
up_read(&pcpu->enable_sem);
@ -513,7 +517,7 @@ static void cpufreq_interactive_idle_end(void)
/* Arm the timer for 1-2 ticks later if not already. */
if (!timer_pending(&pcpu->cpu_timer)) {
cpufreq_interactive_timer_resched(pcpu);
cpufreq_interactive_timer_resched(smp_processor_id());
} else if (time_after_eq(jiffies, pcpu->cpu_timer.expires)) {
del_timer(&pcpu->cpu_timer);
del_timer(&pcpu->cpu_slack_timer);