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Date: Wed, 6 Dec 2017 17:06:35 -0800
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [patch 07/15] mm: memcontrol: fix excessive complexity in
 memory.stat reporting
Message-Id: <20171206170635.e3e45c895750538ee9283033@linux-foundation.org>
In-Reply-To: <20171201135750.GB8097@cmpxchg.org>
References: <5a208303.hxMsAOT0gjSsd0Gf%akpm@linux-foundation.org>
	<20171201135750.GB8097@cmpxchg.org>
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To: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-mm@kvack.org, mhocko@suse.com, vdavydov.dev@gmail.com

On Fri, 1 Dec 2017 13:57:50 +0000 Johannes Weiner <hannes@cmpxchg.org> 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 <hannes@cmpxchg.org>
> ---
> 
> Andrew, can you please merge this fixlet into the original patch?

Did.

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

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