Messages in this thread | | | From | Viresh Kumar <> | Subject | [PATCH V3 0/5] cpufreq: Record stats with fast-switching | Date | Mon, 5 Oct 2020 13:26:00 +0530 |
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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.
V2->V3: - Use READ/WRITE_ONCE() for reset-time as well. - Use unlikely for few conditionals in the hot path. - Better changelogs. - Rebase changes.
V1-V2: - Use READ_ONCE/WRITE_ONCE instead of atomic in the first patch.
-- Viresh
Viresh Kumar (5): cpufreq: stats: Defer stats update to cpufreq_stats_record_transition() cpufreq: stats: Remove locking cpufreq: stats: Mark few conditionals with unlikely() cpufreq: stats: Enable stats for fast-switch as well cpufreq: Move traces and update to policy->cur to cpufreq core
drivers/cpufreq/cpufreq.c | 11 ++++ drivers/cpufreq/cpufreq_stats.c | 89 ++++++++++++++++++++------------ kernel/sched/cpufreq_schedutil.c | 12 +---- 3 files changed, 69 insertions(+), 43 deletions(-)
-- 2.25.0.rc1.19.g042ed3e048af
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