Messages in this thread | ![/](/images/icornerl.gif) | | From | Mathieu Desnoyers <> | Subject | [RFC PATCH 0/2] sched/fair migration reduction features | Date | Wed, 18 Oct 2023 16:45:09 -0400 |
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Hi,
This series introduces two new scheduler features: UTIL_FITS_CAPACITY and SELECT_BIAS_PREV. When used together, they achieve a 47% speedup of a hackbench workload which leaves some idle CPU time on a 192-core AMD EPYC.
The main metrics which are significantly improved are:
- cpu-migrations are reduced by 93%, - CPU utilization is increased by 22%.
Feedback is welcome. I am especially interested to learn whether this series has positive or detrimental effects on performance of other workloads.
Thanks,
Mathieu
Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Valentin Schneider <vschneid@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Ben Segall <bsegall@google.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Daniel Bristot de Oliveira <bristot@redhat.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Swapnil Sapkal <Swapnil.Sapkal@amd.com> Cc: Aaron Lu <aaron.lu@intel.com> Cc: Chen Yu <yu.c.chen@intel.com> Cc: Tim Chen <tim.c.chen@intel.com> Cc: K Prateek Nayak <kprateek.nayak@amd.com> Cc: Gautham R . Shenoy <gautham.shenoy@amd.com> Cc: x86@kernel.org
Mathieu Desnoyers (2): sched/fair: Introduce UTIL_FITS_CAPACITY feature sched/fair: Introduce SELECT_BIAS_PREV to reduce migrations
kernel/sched/fair.c | 77 ++++++++++++++++++++++++++++++++++++----- kernel/sched/features.h | 12 +++++++ kernel/sched/sched.h | 5 +++ 3 files changed, 86 insertions(+), 8 deletions(-)
-- 2.39.2
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