Re: [PATCH 0/2] Reduce SIS scanning

From: Peter Zijlstra
Date: Wed Aug 04 2021 - 09:11:43 EST

On Wed, Aug 04, 2021 at 12:58:55PM +0100, Mel Gorman wrote:
> This is the first two patches from "Modify and/or delete SIS_PROP" and
> focues on improving the hit rate for recent_used_cpu and avoids rescanning
> the target CPU when it's known to be busy. These are relatively simply
> patches in comparison to the full series which could be a regression
> magnet and that series had at least one mistake in it.
> In general, the usual suspects showed mostly small gains with a few
> exceptions. Usual suspects were NAS, hackbench, schbench (Facebook
> latency-sensitive workload), perf pipe, kernel building, git test suite,
> dbench and redis.
> From here, the next obvious candidates are either improving has_idle_cores
> or continuing to try remove/improve SIS_PROP.