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cpufreq: interactive: reduce chance of zero time delta on load eval

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Reschedule load sampling timer after timestamp of sample start taken,
hold spinlock across entire sequence to avoid preemption.  Avoid the
WARN for zero time delta in the load sampling timer function.

Change-Id: Idc10a756f09141decb6df92669521a1ebf0dbc10
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Todd Poynor
2013-04-05 13:25:21 -07:00
committed by John Stultz
parent f71b480fd5
commit aedd63a502
1 changed files with 9 additions and 7 deletions
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16
drivers/cpufreq/cpufreq_interactive.c
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@@ -169,21 +169,23 @@ static inline cputime64_t get_cpu_idle_time(unsigned int cpu,
static void cpufreq_interactive_timer_resched(
struct cpufreq_interactive_cpuinfo *pcpu)
{
unsigned long expires = jiffies + usecs_to_jiffies(timer_rate);
unsigned long expires;
unsigned long flags;
mod_timer_pinned(&pcpu->cpu_timer, expires);
if (timer_slack_val >= 0 && pcpu->target_freq > pcpu->policy->min) {
expires += usecs_to_jiffies(timer_slack_val);
mod_timer_pinned(&pcpu->cpu_slack_timer, expires);
}
spin_lock_irqsave(&pcpu->load_lock, flags);
pcpu->time_in_idle =
get_cpu_idle_time(smp_processor_id(),
&pcpu->time_in_idle_timestamp);
pcpu->cputime_speedadj = 0;
pcpu->cputime_speedadj_timestamp = pcpu->time_in_idle_timestamp;
expires = jiffies + usecs_to_jiffies(timer_rate);
mod_timer_pinned(&pcpu->cpu_timer, expires);
if (timer_slack_val >= 0 && pcpu->target_freq > pcpu->policy->min) {
expires += usecs_to_jiffies(timer_slack_val);
mod_timer_pinned(&pcpu->cpu_slack_timer, expires);
}
spin_unlock_irqrestore(&pcpu->load_lock, flags);
}