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From: Roman Gushchin <guro@fb.com>
To: Shakeel Butt <shakeelb@google.com>
Cc: Michal Hocko <mhocko@suse.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	<cgroups@vger.kernel.org>, <linux-mm@kvack.org>,
	<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] memcg: cleanup racy sum avoidance code
Date: Tue, 27 Jul 2021 19:36:01 -0700	[thread overview]
Message-ID: <YQDCkeFxSnh2GR7I@carbon.dhcp.thefacebook.com> (raw)
In-Reply-To: <20210728012243.3369123-1-shakeelb@google.com>

On Tue, Jul 27, 2021 at 06:22:43PM -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.
> 
> Signed-off-by: Shakeel Butt <shakeelb@google.com>

Acked-by: Roman Gushchin <guro@fb.com>

Thanks!

  reply	other threads:[~2021-07-28  2:36 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 [this message]
2021-07-28  8:21 ` David Hildenbrand
2021-07-28 19:43 ` Andrew Morton
2021-07-28 20:37   ` Shakeel Butt
2021-08-02  6:57 ` Michal Hocko

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