From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Hugh Greenberg <hugh@galliumos.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Mel Gorman <mgorman@techsingularity.net>,
Vlastimil Babka <vbabka@suse.cz>, Rik van Riel <riel@redhat.com>,
Minchan Kim <minchan@kernel.org>, Nitin Gupta <ngupta@vflare.org>,
Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [REGRESSION] [BISECTED] kswapd high CPU usage
Date: Tue, 2 Feb 2016 15:59:50 +0200 [thread overview]
Message-ID: <20160202135950.GA5026@node.shutemov.name> (raw)
In-Reply-To: <loom.20160125T174557-678@post.gmane.org>
On Mon, Jan 25, 2016 at 04:46:58PM +0000, Hugh Greenberg wrote:
> Kirill A. Shutemov <kirill <at> shutemov.name> writes:
>
> >
> > On Sat, Jan 23, 2016 at 03:57:21PM +0000, Hugh Greenberg wrote:
> > > Kirill A. Shutemov <kirill <at> shutemov.name> writes:
> > > >
> > > > Could you try to insert
> "late_initcall(set_recommended_min_free_kbytes);"
> > > > back and check if makes any difference.
> > > >
> > >
> > > We tested adding late_initcall(set_recommended_min_free_kbytes);
> > > back in 4.1.14 and it made a huge difference. We aren't sure if the
> > > issue is 100% fixed, but it could be. We will keep testing it.
> >
> > It would be nice to have values of min_free_kbytes before and after
> > set_recommended_min_free_kbytes() in your configuration.
> >
>
> Before adding set_recommended_min_free_kbytes: 5391
> After: 67584
[ add more people to the thread ]
The 'before' value look low to me for machine with 2G of RAM.
In the bugzilla[1], you've mentioned zram. I wounder if we need to
increase min_free_kbytes when zram is in use as we do for THP.
[1] https://bugzilla.kernel.org/show_bug.cgi?id=110501
--
Kirill A. Shutemov
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next prev parent reply other threads:[~2016-02-02 13:59 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-21 14:28 [REGRESSION] [BISECTED] kswapd high CPU usage Nalorokk
2016-01-21 14:37 ` Fwd: " Nalorokk
2016-01-21 16:16 ` Kirill A. Shutemov
2016-01-23 15:57 ` Hugh Greenberg
2016-01-25 10:38 ` Kirill A. Shutemov
2016-01-25 16:37 ` Hugh Greenberg
2016-01-25 16:46 ` Hugh Greenberg
2016-02-02 13:59 ` Kirill A. Shutemov [this message]
2016-02-02 14:41 ` Sergey Senozhatsky
2016-02-02 16:24 ` Minchan Kim
2016-03-14 16:00 ` Hugh Greenberg
2016-03-14 16:07 ` Hugh Greenberg
2016-03-15 17:16 ` Hugh Greenberg
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