From: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: 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>,
linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Seth Jennings <sjennings@variantweb.net>
Subject: Re: [REGRESSION] [BISECTED] kswapd high CPU usage
Date: Tue, 2 Feb 2016 23:41:40 +0900 [thread overview]
Message-ID: <20160202144140.GA460@swordfish> (raw)
In-Reply-To: <20160202135950.GA5026@node.shutemov.name>
On (02/02/16 15:59), Kirill A. Shutemov wrote:
> > > 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
[add Seth Jennings]
additional info: http://marc.info/?l=linux-mm&m=145373987224270
> The reports are coming from 2GB Haswell chromebooks. I have a 4GB haswell
> chromebook and I cannot reproduce the issue, even if I boot the kernel with
> 2GB or less.
>
> After more testing, we were still able to reproduce the issue. It seems to
> have taken longer to show up this time.
a small note,
I assume, IF min_free_kbytes must be set then probably in zsmalloc (zbud?)
init, not in zram. zswap can use both -- zsmalloc and zbud.
-ss
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next prev parent reply other threads:[~2016-02-02 14:43 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
2016-02-02 14:41 ` Sergey Senozhatsky [this message]
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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