linux-kernel - Re: [linux-next] kcompactd0 stuck in a CPU-burning loop

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Message-ID: <20190128105148.GA15887@jagdpanzerIV>
Date:   Mon, 28 Jan 2019 19:51:48 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Michal Hocko <mhocko@...nel.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Jan Kara <jack@...e.cz>
Subject: Re: [linux-next] kcompactd0 stuck in a CPU-burning loop

On (01/28/19 10:18), Vlastimil Babka wrote:
> On 1/28/19 9:57 AM, Sergey Senozhatsky wrote:
> > Hello,
> > 
> > next-20190125
> > 
> > kcompactd0 is spinning on something, burning CPUs in the meantime:
> 
> Hi, could you check/add this to the earlier thread? Thanks.
> 
> https://lore.kernel.org/lkml/20190126200005.GB27513@amd/T/#u

Hi,

Will reply here.
Thanks for  the link, Vlastimil.

Will "test" Jan's patch (don't have a reproducer yet).
So far, I can confirm that

	echo 3 > /proc/sys/vm/drop_caches

mentioned in that thread does "solve" the issue.

	-ss