I have a kernel specific problem and this seemed like a suitable place to ask.
I would like responces to be CC'ed to me if possible.
I use a 2.6.17-ck1 kernel on an amd64 system. I have observed this
problem on other/older kernels.
Whenever there is serious hard drive activity (such as doing "slocate
-u") ext3_inode_cache and dentry_cache grow to a combined 400-500 MiB.
The amount of objects is more than half a million.
This will slowly decrease to normal, but will take many hours. It does
not result in any OOM, because i have 1 GiB of memory.
As far as i understand hard drive cache should not be in the slab. Are
these just the inode's, because the amount of memory consumption seems
large for that?
I have found a way to clear the memory (and unfortunately most of the cache):
echo 100 > /proc/sys/vm/nr_hugepages
echo 0 > /proc/sys/vm/nr_hugepages
This suggest the kernel can free this memory. It's not the caching
that bothers me, what bothers me is that it seems to reside in the
slab.
I am not a developer, so please keep that in mind when replying.
I hope someone can be of help.
Sincerely,
Maarten Maathuis.
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