Messages in this thread | | | Date | Sun, 11 Sep 2005 23:16:30 -0700 | From | "Martin J. Bligh" <> | Subject | Re: VM balancing issues on 2.6.13: dentry cache not getting shrunk enough |
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--Theodore Ts'o <tytso@mit.edu> wrote (on Sunday, September 11, 2005 23:16:36 -0400):
> On Sun, Sep 11, 2005 at 05:30:46PM +0530, Dipankar Sarma wrote: >> Do you have the /proc/sys/fs/dentry-state output when such lowmem >> shortage happens ? > > Not yet, but the situation occurs on my laptop about 2 or 3 times > (when I'm not travelling and so it doesn't get rebooted). So > reproducing it isn't utterly trivial, but it's does happen often > enough that it should be possible to get the necessary data. > >> This is a problem that Bharata has been investigating at the moment. >> But he hasn't seen anything that can't be cured by a small memory >> pressure - IOW, dentries do get freed under memory pressure. So >> your case might be very useful. Bharata is maintaing an instrumentation >> patch to collect more information and an alternative dentry aging patch >> (using rbtree). Perhaps you could try with those. > > Send it to me, and I'd be happy to try either the instrumentation > patch or the dentry aging patch.
Other thing that might be helpful is to shove a printk in prune_dcache so we can see when it's getting called, and how successful it is, if the more sophisticated stuff doesn't help ;-)
M.
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