linux-kernel - Re: [PATCH] mm: skip current when memcg reclaim

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Message-ID: <CAGWkznE6x=x_xOcnD4-2d0_kkYSFbV2ReWUL_an=CnEZubH9Cg@mail.gmail.com>
Date:   Sat, 16 Oct 2021 16:17:39 +0800
From:   Zhaoyang Huang <huangzhaoyang@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Zhaoyang Huang <zhaoyang.huang@...soc.com>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: skip current when memcg reclaim

On Sat, Oct 16, 2021 at 11:06 AM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Fri, Oct 15, 2021 at 01:00:35PM -0700, Andrew Morton wrote:
> > On Fri, 15 Oct 2021 14:15:29 +0800 Huangzhaoyang <huangzhaoyang@...il.com> wrote:
> >
> > > From: Zhaoyang Huang <zhaoyang.huang@...soc.com>
> > >
> > > Sibling thread of the same process could refault the reclaimed pages
> > > in the same time, which would be typical in None global reclaim and
> > > introduce thrashing.
> >
> > "None" -> "node", I assume?
>
> I think that's "non-global", ie memcg based.
It is exactly what I mean. memcg based reclaim could be worse for page
thrashing.