linux-kernel - Re: kswapd craziness in 3.7

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Date:	Tue, 4 Dec 2012 11:15:33 -0500
From:	Johannes Weiner <hannes@...xchg.org>
To:	Zdenek Kabelac <zkabelac@...hat.com>
Cc:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	George Spelvin <linux@...izon.com>,
	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>,
	Thorsten Leemhuis <fedora@...mhuis.info>,
	Tomas Racek <tracek@...hat.com>, Jan Kara <jack@...e.cz>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Josh Boyer <jwboyer@...il.com>, Valdis.Kletnieks@...edu,
	Jiri Slaby <jslaby@...e.cz>, Bruno Wolff III <bruno@...ff.to>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: kswapd craziness in 3.7

On Tue, Dec 04, 2012 at 10:05:29AM +0100, Zdenek Kabelac wrote:
> Dne 3.12.2012 20:18, Johannes Weiner napsal(a):
> >Szia Zdenek,
> >
> >On Mon, Dec 03, 2012 at 04:23:15PM +0100, Zdenek Kabelac wrote:
> >>Ok, bad news - I've been hit by  kswapd0 loop again -
> >>my kernel git commit cc19528bd3084c3c2d870b31a3578da8c69952f3 again
> >>shown kswapd0 for couple minutes on CPU.
> >>
> >>It seemed to go instantly away when I've drop caches
> >>(echo 3 >/proc/sys/vm/drop_cache)
> >>(After that I've had over 1G free memory)
> >
> >Any chance you could retry with this patch on top?
> >
> >---
> >From: Johannes Weiner <hannes@...xchg.org>
> >Subject: [patch] mm: vmscan: do not keep kswapd looping forever due
> >  to individual uncompactable zones
> >
> >---
> >  mm/vmscan.c | 16 ----------------
> >  1 file changed, 16 deletions(-)
> >
> >diff --git a/mm/vmscan.c b/mm/vmscan.c
> 
> 
> Ok, I'm running now b69f0859dc8e633c5d8c06845811588fe17e68b3 (-rc8)
> with your patch.  I'll be able to give some feedback after couple
> days (if I keep my machine running without reboot - since before
> I had occasional problems with ACPI now resolved.
> (https://bugzilla.kernel.org/show_bug.cgi?id=51071)
> (patch not yet in -rc8)
> I'm also using this extra patch: https://patchwork.kernel.org/patch/1792531/

Okay, fingers crossed!  Thanks for persisting.

> What seems to be triggering condition on my machine - running laptop
> for some days - and having   Thunderbird reaching 0.8G (I guess they
> must keep all my news messages in memory to consume that size) and
> Firefox 1.3GB of consumed
> memory (assuming massive leaking with combination of flash)

Were you able speed this process up in the past?  I.e. by doing a
search over all mail?  Watching 8 nyan cat videos in parallel?

If not, it's probably better not to change anything now...

Thanks!
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