Following patch has introduced per cpu timers or works for ondemand and conservative governors.
commit 2abfa876f1117b0ab45f191fb1f82c41b1cbc8fe Author: Rickard Andersson rickard.andersson@stericsson.com Date: Thu Dec 27 14:55:38 2012 +0000
cpufreq: handle SW coordinated CPUs
This causes additional unnecessary interrupts on all cpus when the load is recently evaluated by any other cpu. i.e. When load is recently evaluated by cpu x, we don't really need any other cpu to evaluate this load again for the next sampling_rate time.
Some sort of code is present to avoid that but we are still getting timer interrupts for all cpus. A good way of avoiding this would be to modify delays for all cpus (policy->cpus) whenever any cpu has evaluated load.
This patchset tries to fix this issue.
These patches are applied here:
http://git.linaro.org/gitweb?p=people/vireshk/linux.git%3Ba=shortlog%3Bh=ref...
V1->V2: - Dropped Workqueue modifications and use system_wq directly.
Viresh Kumar (2): cpufreq: ondemand: Don't update sample_type if we don't evaluate load again cpufreq: governors: Avoid unnecessary per cpu timer interrupts
drivers/cpufreq/cpufreq_conservative.c | 8 ++++--- drivers/cpufreq/cpufreq_governor.c | 39 ++++++++++++++++++++++++---------- drivers/cpufreq/cpufreq_governor.h | 2 ++ drivers/cpufreq/cpufreq_ondemand.c | 34 ++++++++++++++--------------- 4 files changed, 52 insertions(+), 31 deletions(-)