linux-kernel - Re: Is it safe for kthreadd to drain_all

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Message-ID: <20170407163932.GJ16413@dhcp22.suse.cz>
Date:   Fri, 7 Apr 2017 18:39:32 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: Is it safe for kthreadd to drain_all_pages?

On Fri 07-04-17 09:25:33, Hugh Dickins wrote:
[...]
> 24 hours so far, and with a clean /var/log/messages.  Not conclusive
> yet, and of course I'll leave it running another couple of days, but
> I'm increasingly sure that it works as you intended: I agree that
> 
> mm-move-pcp-and-lru-pcp-drainging-into-single-wq.patch
> mm-move-pcp-and-lru-pcp-drainging-into-single-wq-fix.patch
> 
> should go to Linus as soon as convenient.  Though I think the commit
> message needs something a bit stronger than "Quite annoying though".
> Maybe add a line:
> 
> Fixes serious hang under load, observed repeatedly on 4.11-rc.

Yeah, it is much less theoretical now. I will rephrase and ask Andrew to
update the chagelog and send it to Linus once I've got your final go.

Thanks!

-- 
Michal Hocko
SUSE Labs