linux-kernel - Re: [PATCH v3] mm: memcg: add THP swap out info for anonymous reclaim

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Message-ID: <20230913173802.GA48476@cmpxchg.org>
Date:   Wed, 13 Sep 2023 13:38:02 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Vern Hao <haoxing990@...il.com>
Cc:     mhocko@...nel.org, roman.gushchin@...ux.dev, shakeelb@...gle.com,
        akpm@...ux-foundation.org, cgroups@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Xin Hao <vernhao@...cent.com>
Subject: Re: [PATCH v3] mm: memcg: add THP swap out info for anonymous reclaim

On Thu, Sep 14, 2023 at 12:49:37AM +0800, Vern Hao wrote:
> From: Xin Hao <vernhao@...cent.com>
> 
> At present, we support per-memcg reclaim strategy, however we do not
> know the number of transparent huge pages being reclaimed, as we know
> the transparent huge pages need to be splited before reclaim them, and
> they will bring some performance bottleneck effect. for example, when
> two memcg (A & B) are doing reclaim for anonymous pages at same time,
> and 'A' memcg is reclaiming a large number of transparent huge pages, we
> can better analyze that the performance bottleneck will be caused by 'A'
> memcg.  therefore, in order to better analyze such problems, there add
> THP swap out info for per-memcg.
> 
> Suggested-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Xin Hao <vernhao@...cent.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>