linux-kernel - Re: [PATCH 1/4] mm/memcg: use NUMA_NO_NODE to indicate allocation from unspecified node

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Message-ID: <CALvZod6odMTNMXNqc2KsmOYv0vEAT-eTZ2xP-UhkQSo0pf7+bA@mail.gmail.com>
Date:   Sun, 16 Jan 2022 11:23:36 -0800
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Wei Yang <richard.weiyang@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Roman Gushchin <guro@...com>, Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        Muchun Song <songmuchun@...edance.com>,
        Yang Shi <shy828301@...il.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Cgroups <cgroups@...r.kernel.org>, Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH 1/4] mm/memcg: use NUMA_NO_NODE to indicate allocation
 from unspecified node

On Wed, Jan 12, 2022 at 12:56 AM Michal Hocko <mhocko@...e.com> wrote:
>
> On Wed 12-01-22 00:46:34, Wei Yang wrote:
> > On Tue, Jan 11, 2022 at 09:40:20AM +0100, Michal Hocko wrote:
> > >On Tue 11-01-22 01:02:59, Wei Yang wrote:
> > >> Instead of use "-1", let's use NUMA_NO_NODE for consistency.
> > >>
> > >> Signed-off-by: Wei Yang <richard.weiyang@...il.com>
> > >
> > >I am not really sure this is worth it. After the merge window I plan to
> > >post http://lkml.kernel.org/r/20211214100732.26335-1-mhocko@kernel.org.
> >
> > Give me some time to understand it :-)
>
> Just for the record, here is what I have put on top of that series:
> ---
> From b7195eba02fe6308a6927450f4630057c05e808e Mon Sep 17 00:00:00 2001
> From: Wei Yang <richard.weiyang@...il.com>
> Date: Tue, 11 Jan 2022 09:45:25 +0100
> Subject: [PATCH] memcg: do not tweak node in alloc_mem_cgroup_per_node_info
>
> alloc_mem_cgroup_per_node_info is allocated for each possible node and
> this used to be a problem because not !node_online nodes didn't have
> appropriate data structure allocated. This has changed by "mm: handle
> uninitialized numa nodes gracefully" so we can drop the special casing
> here.
>
> Signed-off-by: Wei Yang <richard.weiyang@...il.com>
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Reviewed-by: Shakeel Butt <shakeelb@...gle.com>