Rafael J. Wysocki 536bd00cdb sched/fair: Fix !CONFIG_SMP kernel cpufreq governor breakage ...

The following commit:

  34e2c555f3 ("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: 34e2c555f3 (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>

2016-05-07 07:45:34 +02:00

..

auto_group.c

sched/core: Move the sched_to_prio[] arrays out of line

2015-12-04 10:34:46 +01:00

auto_group.h

sched, timer: Convert usages of ACCESS_ONCE() in the scheduler to READ_ONCE()/WRITE_ONCE()

2015-05-08 12:11:32 +02:00

clock.c

sched-clock: Migrate to use new tick dependency mask model

2016-03-02 16:44:57 +01:00

completion.c

sched/completion: Serialize completion_done() with complete()

2015-02-18 14:27:40 +01:00

core.c

nohz/full, sched/rt: Fix missed tick-reenabling bug in sched_can_stop_tick()

2016-04-28 10:28:55 +02:00

cpuacct.c

Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-03-24 09:42:50 -07:00

cpuacct.h

sched/cpuacct: Simplify the cpuacct code

2016-03-21 11:00:28 +01:00

cpudeadline.c

sched/deadline: Unify dl_time_before() usage

2015-09-23 09:51:25 +02:00

cpudeadline.h

sched/deadline: Unify dl_time_before() usage

2015-09-23 09:51:25 +02:00

cpufreq.c

cpufreq: Move scheduler-related code to the sched directory

2016-03-10 20:44:47 +01:00

cpupri.c

Merge commit '3cf2f34' into sched/core, to fix build error

2014-06-12 13:46:37 +02:00

cpupri.h

sched/cpupri: Remove unnecessary definitions in cpupri.h

2014-11-16 10:58:59 +01:00

cputime.c

sched/cputime: Fix steal_account_process_tick() to always return jiffies

2016-03-08 12:24:56 +01:00

deadline.c

Merge tag 'pm+acpi-4.6-rc1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2016-03-16 14:10:53 -07:00

debug.c

sched/debug: Add deadline scheduler bandwidth ratio to /proc/sched_debug

2016-02-29 09:53:07 +01:00

fair.c

sched/fair: Fix !CONFIG_SMP kernel cpufreq governor breakage

2016-05-07 07:45:34 +02:00

features.h

sched/fair: Convert arch_scale_cpu_capacity() from weak function to #define

2015-09-13 09:52:55 +02:00

idle_task.c

sched/fair: Remove empty idle enter and exit functions

2015-11-23 09:37:51 +01:00

idle.c

rcu: Make CPU_DYING_IDLE an explicit call

2016-03-01 20:36:58 +01:00

loadavg.c

sched: Move the loadavg code to a more obvious location

2015-05-08 12:04:12 +02:00

Makefile

kernel: add kcov code coverage

2016-03-22 15:36:02 -07:00

rt.c

Merge tag 'pm+acpi-4.6-rc1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

2016-03-16 14:10:53 -07:00

sched.h

Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-03-24 09:42:50 -07:00

stats.c

sched: use %*pb[l] to print bitmaps including cpumasks and nodemasks

2015-02-13 21:21:37 -08:00

stats.h

sched/debug: Make schedstats a runtime tunable that is disabled by default

2016-02-09 11:54:23 +01:00

stop_task.c

sched: Make sched_class::set_cpus_allowed() unconditional

2015-08-12 12:06:09 +02:00

swait.c

wait.[ch]: Introduce the simple waitqueue (swait) implementation

2016-02-25 11:27:16 +01:00

wait.c

sched/wait: Fix the signal handling fix

2015-12-13 14:30:59 -08:00