In article <3B686D73.6040602@starentnetworks.com> you write:
>
>Note that we increase the default values for certain FS parameters:
>
>echo '16384' >/proc/sys/fs/super-max
>echo '32768' >/proc/sys/fs/file-max
>echo '65535' > /proc/sys/fs/inode-max
Doesn't matter.
The thing that you end up hitting looks very much like just tons of
negative dentries lying around.
If you are even moderately confident about playing around with the
kernel, I would suggest testing the following approach (if you aren't
comforable with playing with the kernel, I hope somebody else is willing
to try this out, or I could try to cook up a patch to test later this
week)
- add a new dentry list in addition to the current 'dentry_unused' list
in linux/fs/dentry.c:
static LIST_HEAD(dentry_unused_negative);
- when 'dput()' adds a dentry to the old 'dentry_unused' list it would
instead check whether the dentry is negative, and if so add it to the
negative list instead:
list = &dentry_unused;
if (!dentry->d_inode)
list = &dentry_unused_negative;
list_add(&dentry->d_lru, list);
- add a new "shrink_negative_dentries()" function that just does
something like
struct list_head *tmp;
spin_lock(&dcache_lock);
for (;;) {
struct list_head * tmp = dentry_unused_negative.next;
if (tmp == &dentry_unused_negative)
break;
struct dentry *dentry = list_entry(tmp, struct dentry, d_lru);
tmp = tmp->next;
if (atomic_read(&dentry->d_count))
BUG();
if (dentry->d_inode)
BUG();
prune_one_dentry(dentry);
/* prune_one_dentry() releases the lock */
spin_lock(&dcache_lock);
}
spin_unlock(&dcache_lock);
- make all the things that shrink dentries (notably the
shrink_dcache_memory() function) call the above function first.
Does that fix the behaviour for you?
Linus
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This archive was generated by hypermail 2b29 : Tue Aug 07 2001 - 21:00:14 EST