cpufreq: Record stats with fast-switching
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- v3 Latest5 patches 1 replyIn review
- v24 patches 18 repliesSuperseded
- v14 patches 5 repliesSuperseded
Changes in v3 from the cover letter
- Use READ/WRITE_ONCE() for reset-time as well.
- Use unlikely for few conditionals in the hot path.
- Better changelogs.
- Rebase changes.
Patches in v3 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/5 | cpufreq: stats: Defer stats update to cpufreq_stats_record_transition()drivers/ | +56 | 0 replies | |
| 2/5 | cpufreq: stats: Remove lockingdrivers/ | +0 | 0 replies | |
| 3/5 | cpufreq: stats: Mark few conditionals with unlikely()drivers/ | +2 | 0 replies | |
| 4/5 | cpufreq: stats: Enable stats for fast-switch as welldrivers/ drivers/ | +4 | 0 replies | |
| 5/5 | cpufreq: Move traces and update to policy->cur to cpufreq coredrivers/ kernel/ | +8 | 0 replies |
Reviews trailers per patch
No Reviewed-by, Acked-by or Tested-by trailers for v3 yet.
Cover letter [PATCH V3 0/5] cpufreq: Record stats with fast-switching
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(-)
Signature · 1 line
2.25.0.rc1.19.g042ed3e048af