linux-kernel - Re: [PATCH -V8 2/6] memory tiering: add page promotion counter

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Message-ID: <87y27y1u5v.fsf@yhuang6-desk2.ccr.corp.intel.com>
Date:   Wed, 15 Sep 2021 09:53:16 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     Yang Shi <shy828301@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Rik van Riel <riel@...riel.com>,
        Mel Gorman <mgorman@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Zi Yan <ziy@...dia.com>, Wei Xu <weixugc@...gle.com>,
        osalvador <osalvador@...e.de>,
        Shakeel Butt <shakeelb@...gle.com>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH -V8 2/6] memory tiering: add page promotion counter

Yang Shi <shy828301@...il.com> writes:

> On Mon, Sep 13, 2021 at 6:37 PM Huang Ying <ying.huang@...el.com> wrote:
>>
>> To distinguish the number of the memory tiering promoted pages from
>> that of the originally inter-socket NUMA balancing migrated pages.
>> The counter is per-node (count in the target node).  So this can be
>> used to identify promotion imbalance among the NUMA nodes.
>
> I'd like this patch be the very first one in the series. Since we need
> such counters regardless of all the optimizations. And actually I
> think this patch could go with the merged "migration in lieu of
> discard" patchset.

Yes.  This sounds reasonable.  I will change this in the next version.

Best Regards,
Huang, Ying