linux-kernel - Re: [PATCH v4 3/9] mm/lru: replace pgdat lru

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Date:   Tue, 19 Nov 2019 08:49:34 -0800
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tejun Heo <tj@...nel.org>, Hugh Dickins <hughd@...gle.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Matthew Wilcox <willy@...radead.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Roman Gushchin <guro@...com>,
        Chris Down <chris@...isdown.name>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vlastimil Babka <vbabka@...e.cz>, Qian Cai <cai@....pw>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        swkhack <swkhack@...il.com>,
        "Potyra, Stefan" <Stefan.Potyra@...ktrobit.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Colin Ian King <colin.king@...onical.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Peng Fan <peng.fan@....com>,
        Nikolay Borisov <nborisov@...e.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Yafang Shao <laoar.shao@...il.com>
Subject: Re: [PATCH v4 3/9] mm/lru: replace pgdat lru_lock with lruvec lock

On Tue, Nov 19, 2019 at 4:24 AM Alex Shi <alex.shi@...ux.alibaba.com> wrote:
>
> This patchset move lru_lock into lruvec, give a lru_lock for each of
> lruvec, thus bring a lru_lock for each of memcg per node.
>
> This is the main patch to replace per node lru_lock with per memcg
> lruvec lock.
>
> We introduce function lock_page_lruvec, it's same as vanilla pgdat lock
> when memory cgroup unset, w/o memcg, the function will keep repin the
> lruvec's lock to guard from page->mem_cgroup changes in page
> migrations between memcgs. (Thanks Hugh Dickins and Konstantin
> Khlebnikov reminder on this. Than the core logical is same as their
> previous patchs)
>
> According to Daniel Jordan's suggestion, I run 64 'dd' with on 32
> containers on my 2s* 8 core * HT box with the modefied case:
>   https://git.kernel.org/pub/scm/linux/kernel/git/wfg/vm-scalability.git/tree/case-lru-file-readtwice
>
> With this and later patches, the dd performance is 144MB/s, the vanilla
> kernel performance is 123MB/s. 17% performance increased.
>
> Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...nel.org>
> Cc: Vladimir Davydov <vdavydov.dev@...il.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Roman Gushchin <guro@...com>
> Cc: Shakeel Butt <shakeelb@...gle.com>
> Cc: Chris Down <chris@...isdown.name>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Mel Gorman <mgorman@...hsingularity.net>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Qian Cai <cai@....pw>
> Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
> Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> Cc: "Jérôme Glisse" <jglisse@...hat.com>
> Cc: Andrea Arcangeli <aarcange@...hat.com>
> Cc: Yang Shi <yang.shi@...ux.alibaba.com>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
> Cc: swkhack <swkhack@...il.com>
> Cc: "Potyra, Stefan" <Stefan.Potyra@...ktrobit.com>
> Cc: Mike Rapoport <rppt@...ux.vnet.ibm.com>
> Cc: Stephen Rothwell <sfr@...b.auug.org.au>
> Cc: Colin Ian King <colin.king@...onical.com>
> Cc: Jason Gunthorpe <jgg@...pe.ca>
> Cc: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
> Cc: Matthew Wilcox <willy@...radead.org>
> Cc: Peng Fan <peng.fan@....com>
> Cc: Nikolay Borisov <nborisov@...e.com>
> Cc: Ira Weiny <ira.weiny@...el.com>
> Cc: Kirill Tkhai <ktkhai@...tuozzo.com>
> Cc: Yafang Shao <laoar.shao@...il.com>
> Cc: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-mm@...ck.org
> Cc: cgroups@...r.kernel.org

This patch (and series) still have unsafe accesses to lruvec.

Alex, I was hoping that you would drop this series in favor of Hugh's
patches. Anyways I will post Hugh patches for review to be considered
for 5.6. I will run a couple of performance experiments.

Shakeel