linux-kernel - Re: [PATCH v18 00/32] per memcg lru

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Date:   Mon, 24 Aug 2020 15:50:10 -0400
From:   Qian Cai <cai@....pw>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Alex Shi <alex.shi@...ux.alibaba.com>, mgorman@...hsingularity.net,
        tj@...nel.org, hughd@...gle.com, khlebnikov@...dex-team.ru,
        daniel.m.jordan@...cle.com, willy@...radead.org,
        hannes@...xchg.org, lkp@...el.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
        shakeelb@...gle.com, iamjoonsoo.kim@....com,
        richard.weiyang@...il.com, kirill@...temov.name,
        alexander.duyck@...il.com, rong.a.chen@...el.com, mhocko@...e.com,
        vdavydov.dev@...il.com, shy828301@...il.com
Subject: Re: [PATCH v18 00/32] per memcg lru_lock

On Mon, Aug 24, 2020 at 11:42:04AM -0700, Andrew Morton wrote:
> On Mon, 24 Aug 2020 20:54:33 +0800 Alex Shi <alex.shi@...ux.alibaba.com> wrote:
> 
> > The new version which bases on v5.9-rc2. The first 6 patches was picked into
> > linux-mm, and add patch 25-32 that do some further post optimization.
> 
> 32 patches, version 18.  That's quite heroic.  I'm unsure whether I
> should merge it up at this point - what do people think?

I certainly hope not given how buggy the previous reversion and Alex's other
patchset are. There is really no room for the shortcut this time.

> 
> > 
> > Following Daniel Jordan's suggestion, I have run 208 'dd' with on 104
> > containers on a 2s * 26cores * HT box with a modefied case:
> > https://git.kernel.org/pub/scm/linux/kernel/git/wfg/vm-scalability.git/tree/case-lru-file-readtwice
> > With this patchset, the readtwice performance increased about 80%
> > in concurrent containers.
> 
> That's rather a slight amount of performance testing for a huge
> performance patchset!  Is more detailed testing planned?
> 
>