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[0/4] cpufreq: Record stats with fast-switching

Message ID cover.1599031227.git.viresh.kumar@linaro.org
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Series cpufreq: Record stats with fast-switching | expand

Message

Viresh Kumar Sept. 2, 2020, 7:24 a.m. UTC 
Hi,

We disabled recording cpufreq stats when fast switching was introduced
to the cpufreq core as the cpufreq stats required to take a spinlock and
that can't be allowed (for performance reasons) on scheduler's hot path.

Here is an attempt to get rid of the lock and bring back the support.

--
Viresh

Viresh Kumar (4):
  cpufreq: stats: Defer stats update to
    cpufreq_stats_record_transition()
  cpufreq: stats: Remove locking
  cpufreq: stats: Enable stats for fast-switch as well
  cpufreq: Move traces and update to policy->cur to cpufreq core

 drivers/cpufreq/cpufreq.c        | 16 +++++-
 drivers/cpufreq/cpufreq_stats.c  | 87 ++++++++++++++++++++------------
 kernel/sched/cpufreq_schedutil.c | 12 +----
 3 files changed, 72 insertions(+), 43 deletions(-)

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2.25.0.rc1.19.g042ed3e048af