linux-kernel - Re: [Bug #12210] 2.6.28-rc8 big regression in VM

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Message-ID: <20090226180636.GE4374@ics.muni.cz>
Date:	Thu, 26 Feb 2009 19:06:36 +0100
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
	jbarnes@...tuousgeek.org, eric@...olt.net
Subject: Re: [Bug #12210] 2.6.28-rc8 big regression in VM

Hello,

you may remember that I reported regression in VM. I used you filecache module
and discovered that the leaks are caused by these items:
# filecache 1.0
#      ino       size   cached cached% refcnt state dev          file
    167302         16       16     100      1    d- 00:08(tmpfs) /drm\040mm\040object\040(deleted)
    167301         16       16     100      1    d- 00:08(tmpfs) /drm\040mm\040object\040(deleted)
    167300         16       16     100      1    d- 00:08(tmpfs) /drm\040mm\040object\040(deleted)
    167299          4        4     100      1    -- 00:08(tmpfs) /drm\040mm\040object\040(deleted)
    167290          8        8     100      1    -- 00:08(tmpfs) /drm\040mm\040object\040(deleted)
    167289          8        8     100      1    -- 00:08(tmpfs) /drm\040mm\040object\040(deleted)
    167288         16       16     100      1    -- 00:08(tmpfs) /drm\040mm\040object\040(deleted)
    167287         16       16     100      1    d- 00:08(tmpfs) /drm\040mm\040object\040(deleted)

there are tons of those items:
cat /proc/filecache  | grep drm | wc -l
14224

Do you have any clues what happens here? Is it a bug in kernel VM system or it
is more likely a bug in Intel's GEM drm driver? Right now it results in 500MB
of undropable cache.

Also lsof reports many leaked file descriptors:
lsof | grep drm | wc -l
7326

-- 
Lukáš Hejtmánek
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