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Date:   Wed, 27 Nov 2019 10:00:46 +0000
From:   Mel Gorman <mgorman@suse.de>
To:     ?????? <yun.wang@linux.alibaba.com>
Cc:     Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Juri Lelli <juri.lelli@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ben Segall <bsegall@google.com>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Kees Cook <keescook@chromium.org>,
        Iurii Zaikin <yzaikin@google.com>,
        Michal Koutn? <mkoutny@suse.com>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-doc@vger.kernel.org,
        "Paul E. McKenney" <paulmck@linux.ibm.com>
Subject: Re: [PATCH v2 2/3] sched/numa: expose per-task
 pages-migration-failure
Message-ID: <20191127100046.GM28938@suse.de>
References: <743eecad-9556-a241-546b-c8a66339840e@linux.alibaba.com>
 <207ef46c-672c-27c8-2012-735bd692a6de@linux.alibaba.com>
 <3931bf05-2939-0499-7660-8cc9a6f71c9a@linux.alibaba.com>
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On Wed, Nov 27, 2019 at 09:50:01AM +0800, ?????? wrote:
> NUMA balancing will try to migrate pages between nodes, which
> could caused by memory policy or numa group aggregation, while
> the page migration could failed too for eg when the target node
> run out of memory.
> 
> Since this is critical to the performance, admin should know
> how serious the problem is, and take actions before it causing
> too much performance damage, thus this patch expose the counter
> as 'migfailed' in '/proc/PID/sched'.
> 
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Michal Koutný <mkoutny@suse.com>
> Suggested-by: Mel Gorman <mgorman@suse.de>
> Signed-off-by: Michael Wang <yun.wang@linux.alibaba.com>

This patch can be treated independently of the rest of the series as
it's not directly related.

Acked-by: Mel Gorman <mgorman@suse.de>

-- 
Mel Gorman
SUSE Labs