From: Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>
Subject: Re: [PATCH v3] mm: memcg: add THP swap out info for anonymous reclaim
Date: Wed, 13 Sep 2023 13:38:02 -0400
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To: Vern Hao <haoxing990-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, roman.gushchin-fxUVXftIFDnyG1zEObXtfA@public.gmane.org, shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Xin Hao <vernhao-1Nz4purKYjRBDgjK7y7TUQ@public.gmane.org>

On Thu, Sep 14, 2023 at 12:49:37AM +0800, Vern Hao wrote:
> From: Xin Hao <vernhao-1Nz4purKYjRBDgjK7y7TUQ@public.gmane.org>
> 
> 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-druUgvl0LCNAfugRpC6u6w@public.gmane.org>
> Signed-off-by: Xin Hao <vernhao-1Nz4purKYjRBDgjK7y7TUQ@public.gmane.org>

Acked-by: Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>