linux-kernel - Re: [PATCH v6 0/4] sched/fair: Improve scan efficiency of SIS

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Date:   Fri, 4 Nov 2022 15:29:30 +0800
From:   Abel Wu <wuyun.abel@...edance.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Mel Gorman <mgorman@...e.de>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Valentin Schneider <valentin.schneider@....com>
Cc:     Josh Don <joshdon@...gle.com>, Chen Yu <yu.c.chen@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        "Gautham R . Shenoy" <gautham.shenoy@....com>,
        Aubrey Li <aubrey.li@...el.com>,
        Qais Yousef <qais.yousef@....com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        Yicong Yang <yangyicong@...wei.com>,
        Barry Song <21cnbao@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 0/4] sched/fair: Improve scan efficiency of SIS

Ping :)

On 10/19/22 8:28 PM, Abel Wu wrote:
> This patchset tries to improve SIS scan efficiency by recording idle
> cpus in a cpumask for each LLC which will be used as a target cpuset
> in the domain scan. The cpus are recorded at CORE granule to avoid
> tasks being stack on same core.
> 
> v5 -> v6:
>   - Rename SIS_FILTER to SIS_CORE as it can only be activated when
>     SMT is enabled and better describes the behavior of CORE granule
>     update & load delivery.
>   - Removed the part of limited scan for idle cores since it might be
>     better to open another thread to discuss the strategies such as
>     limited or scaled depth. But keep the part of full scan for idle
>     cores when LLC is overloaded because SIS_CORE can greatly reduce
>     the overhead of full scan in such case.
>   - Removed the state of sd_is_busy which indicates an LLC is fully
>     busy and we can safely skip the SIS domain scan. I would prefer
>     leave this to SIS_UTIL.
>   - The filter generation mechanism is replaced by in-place updates
>     during domain scan to better deal with partial scan failures.
>   - Collect Reviewed-bys from Tim Chen
> 
> ...
>