On Tue, Dec 18, 2007 at 12:28:04PM +0100, Damien Wyart wrote:
> Hello,
>
> As a follow-up to <http://marc.info/?l=linux-kernel&m=119796120524618&w=2>
> (LKML seems down right now so I am not linking to it), I have detected an
> important problem with these two patches: after applying them by hand
> (downloaded them raw from SGI's gitweb) on top of 2.6.24-rc5-git5 (they have
> not yet been pulled into mainline by Linux as of this morning) for testing
> purposes, I noticed upon reboot that "ls -l" on directories with many files
> and subdirectories (around 5000 entries) takes several hundreds of MB in RAM
> and then dies with "memory exhausted" error.
Ok. I haven't noticed anything wrong with directories up to about 250,000
files in the last few days. The ls -l I just did on a directory with
15000 entries (btree format) used about 5MB of RAM. extent format
directories appear to work fine as well (tested 500 entries).
Can you:
a) isolate the problem to one patch or the other. My guess
would be the directory mod, but.....
b) show your working ;)
- what platform (i386, x86_64, etc)
- what debug options
- commands and output that shows the problem
- strace of ls -l going bad
- xfs_info from filesystem in question
> I also noticed that ldconfig takes a lot of time to complete, and firefox
> seems also to eat much more memory than usual. Reverting the two patches
> (going back to vanilla rc5-git5) makes these problems go away. I am not
> able to test right now if only one of the patches is bogus or if both of
> them are concerned.
Well, there goes a).....
> As the symptoms are easy to reproduce, I guess this is some kind of brown
> paper bag bug and will be easy for XFS experts to spot.
Well, not reproducable on my test boxes. It may well be a brown paper
bag job, but it's not obvious.
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
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