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From: Andrew Morton <>
To: Johannes Weiner <>
Subject: Re: [patch 07/15] mm: memcontrol: fix excessive complexity in memory.stat reporting
Date: Wed, 6 Dec 2017 17:06:35 -0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Fri, 1 Dec 2017 13:57:50 +0000 Johannes Weiner <> wrote:

> The memcg cpu_dead callback can be called early during startup
> (CONFIG_DEBUG_HOTPLUG_CPU0) with preemption enabled, which triggers a
> warning in its __this_cpu_xchg() calls. But CPU locality is always
> guaranteed, which is the only thing we really care about here.
> Using the preemption-safe this_cpu_xchg() addresses this problem.
> Signed-off-by: Johannes Weiner <>
> ---
> Andrew, can you please merge this fixlet into the original patch?


I see that lkp-robot identified a performance regression and pointed
the finger at this patch?

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  reply	other threads:[~2017-12-07  1:06 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-30 22:15 akpm
2017-12-01 13:57 ` Johannes Weiner
2017-12-07  1:06   ` Andrew Morton [this message]
2018-01-12 17:05     ` Johannes Weiner

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