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| author | Viresh Kumar <viresh.kumar@linaro.org> | 2016-11-15 13:53:22 +0530 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-11-16 23:21:08 +0100 |
| commit | 02a7b1ee3baa15a98b541d8cfd156bbe1a091c20 (patch) | |
| tree | 0d0fbd9b1dfa5cc3b55cbae951161c0cbd040120 /Kbuild | |
| parent | 4a71ce4348bb61740d411822357061f8bf870f4c (diff) | |
| download | linux-02a7b1ee3baa15a98b541d8cfd156bbe1a091c20.tar.bz2 | |
cpufreq: schedutil: move slow path from workqueue to SCHED_FIFO task
If slow path frequency changes are conducted in a SCHED_OTHER context
then they may be delayed for some amount of time, including
indefinitely, when real time or deadline activity is taking place.
Move the slow path to a real time kernel thread. In the future the
thread should be made SCHED_DEADLINE. The RT priority is arbitrarily set
to 50 for now.
Hackbench results on ARM Exynos, dual core A15 platform for 10
iterations:
$ hackbench -s 100 -l 100 -g 10 -f 20
Before After
---------------------------------
1.808 1.603
1.847 1.251
2.229 1.590
1.952 1.600
1.947 1.257
1.925 1.627
2.694 1.620
1.258 1.621
1.919 1.632
1.250 1.240
Average:
1.8829 1.5041
Based on initial work by Steve Muckle.
Signed-off-by: Steve Muckle <smuckle.linux@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Kbuild')
0 files changed, 0 insertions, 0 deletions