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SubjectRe: [Bug #12210] 2.6.28-rc8 big regression in VM
Date
Hi,

> 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

lsof output indicate any process don't close this files.
I would like to hear drm driver developer's opinion.
if many mapped file is unclosed, it seems misdesigned memory wasting.






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