LKML Archive on
help / color / mirror / Atom feed
From: Andrew Morton <>
To: Shakeel Butt <>
Cc: Michal Hocko <>,
	Johannes Weiner <>,
	Roman Gushchin <>,,,
Subject: Re: [PATCH] memcg: cleanup racy sum avoidance code
Date: Wed, 28 Jul 2021 12:43:26 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Tue, 27 Jul 2021 18:22:43 -0700 Shakeel Butt <> wrote:

> We used to have per-cpu memcg and lruvec stats and the readers have to
> traverse and sum the stats from each cpu. This summing was racy and may
> expose transient negative values. So, an explicit check was added to
> avoid such scenarios. Now these stats are moved to rstat infrastructure
> and are no more per-cpu, so we can remove the fixup for transient
> negative values.

We can't do anything about the same code in lruvec_page_state_local()?

  parent reply	other threads:[~2021-07-28 19:43 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-28  1:22 Shakeel Butt
2021-07-28  2:36 ` Roman Gushchin
2021-07-28  8:21 ` David Hildenbrand
2021-07-28 19:43 ` Andrew Morton [this message]
2021-07-28 20:37   ` Shakeel Butt
2021-08-02  6:57 ` Michal Hocko

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \
    --subject='Re: [PATCH] memcg: cleanup racy sum avoidance code' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).