[Intel-gfx] [Bug #12210] 2.6.28-rc8 big regression in VM

[Lukas Hejtmanek]

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