linux-kernel - Re: [PATCH v7 0/2] sched/fair: Scan cluster before scanning LLC in wake-up path

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Date:   Wed,  7 Sep 2022 23:52:07 +1200
From:   Barry Song <21cnbao@...il.com>
To:     yangyicong@...wei.com, peterz@...radead.org
Cc:     21cnbao@...il.com, bristot@...hat.com, bsegall@...gle.com,
        dietmar.eggemann@....com, ego@...ux.vnet.ibm.com,
        gautham.shenoy@....com, guodong.xu@...aro.org,
        hesham.almatary@...wei.com, john.garry@...wei.com,
        jonathan.cameron@...wei.com, juri.lelli@...hat.com,
        kprateek.nayak@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linuxarm@...wei.com,
        mingo@...hat.com, prime.zeng@...wei.com, rostedt@...dmis.org,
        shenyang39@...wei.com, srikar@...ux.vnet.ibm.com,
        tim.c.chen@...ux.intel.com, vincent.guittot@...aro.org,
        wuyun.abel@...edance.com, yangyicong@...ilicon.com,
        yu.c.chen@...el.com
Subject: Re: [PATCH v7 0/2] sched/fair: Scan cluster before scanning LLC in wake-up path

> From: Yicong Yang <yangyicong@...ilicon.com>

> This is the follow-up work to support cluster scheduler. Previously
> we have added cluster level in the scheduler for both ARM64[1] and
> X86[2] to support load balance between clusters to bring more memory
> bandwidth and decrease cache contention. This patchset, on the other
> hand, takes care of wake-up path by giving CPUs within the same cluster
> a try before scanning the whole LLC to benefit those tasks communicating
> with each other.

> Barry Song (2):
>   sched: Add per_cpu cluster domain info and cpus_share_lowest_cache API
>   sched/fair: Scan cluster before scanning LLC in wake-up path

Hi Peter,
I believe this one has been ready. It has also gotten widely reviewed and
tested on platforms w/ and w/o clusters.
Can you please pick up this?

Thanks
Barry