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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-05-06 14:58:43 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-05-07 07:45:34 +0200 |
| commit | 536bd00cdbb7b908573e5a93bae67b64cbae60d8 (patch) | |
| tree | 9fd3b8e3103971ffc430ad978617a844468e9e47 /init/do_mounts_initrd.c | |
| parent | nohz/full, sched/rt: Fix missed tick-reenabling bug in sched_can_stop_tick() (diff) | |
| download | linux-536bd00cdbb7b908573e5a93bae67b64cbae60d8.tar.xz linux-536bd00cdbb7b908573e5a93bae67b64cbae60d8.zip | |
sched/fair: Fix !CONFIG_SMP kernel cpufreq governor breakage
The following commit:
34e2c555f3e1 ("cpufreq: Add mechanism for registering utilization update callbacks")
overlooked the fact that update_load_avg(), where CFS invokes cpufreq
utilization update callbacks, becomes an empty stub on UP kernels.
In consequence, if !CONFIG_SMP, cpufreq governors are never invoked
from CFS and they do not have a chance to evaluate CPU performace
levels and update them often enough.
Needless to say, things don't work as expected then.
Fix the problem by making the !CONFIG_SMP stub of update_load_avg()
invoke cpufreq update callbacks too.
Reported-by: Steve Muckle <steve.muckle@linaro.org>
Tested-by: Steve Muckle <steve.muckle@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Steve Muckle <steve.muckle@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux PM list <linux-pm@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Fixes: 34e2c555f3e1 (cpufreq: Add mechanism for registering utilization update callbacks)
Link: http://lkml.kernel.org/r/6282396.VVEdgVYxO3@vostro.rjw.lan
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'init/do_mounts_initrd.c')
0 files changed, 0 insertions, 0 deletions