Commit f2e21c96 authored by Eero Nurkkala's avatar Eero Nurkkala Committed by Thomas Gleixner

NOHZ: Properly feed cpufreq ondemand governor

A call from irq_exit() may occasionally pause the timing
info for cpufreq ondemand governor. This results in the
cpufreq ondemand governor to fail to calculate the 
system load properly. Thus, relocate the checks for this
particular case to keep the governor always functional.
Signed-off-by: default avatarEero Nurkkala <ext-eero.nurkkala@nokia.com>
Reported-by: default avatarTero Kristo <tero.kristo@nokia.com>
Acked-by: default avatarRik van Riel <riel@redhat.com>
Acked-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent cd86a536
...@@ -222,6 +222,15 @@ void tick_nohz_stop_sched_tick(int inidle) ...@@ -222,6 +222,15 @@ void tick_nohz_stop_sched_tick(int inidle)
cpu = smp_processor_id(); cpu = smp_processor_id();
ts = &per_cpu(tick_cpu_sched, cpu); ts = &per_cpu(tick_cpu_sched, cpu);
/*
* Call to tick_nohz_start_idle stops the last_update_time from being
* updated. Thus, it must not be called in the event we are called from
* irq_exit() with the prior state different than idle.
*/
if (!inidle && !ts->inidle)
goto end;
now = tick_nohz_start_idle(ts); now = tick_nohz_start_idle(ts);
/* /*
...@@ -239,9 +248,6 @@ void tick_nohz_stop_sched_tick(int inidle) ...@@ -239,9 +248,6 @@ void tick_nohz_stop_sched_tick(int inidle)
if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE)) if (unlikely(ts->nohz_mode == NOHZ_MODE_INACTIVE))
goto end; goto end;
if (!inidle && !ts->inidle)
goto end;
ts->inidle = 1; ts->inidle = 1;
if (need_resched()) if (need_resched())
......
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