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fs: use percpu counter for nr_dentry and nr_dentry_unused

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The nr_dentry stat is a globally touched cacheline and atomic operation
twice over the lifetime of a dentry. It is used for the benfit of userspace
only. Turn it into a per-cpu counter and always decrement it in d_free instead
of doing various batching operations to reduce lock hold times in the callers.

Based on an earlier patch from Nick Piggin <npiggin@suse.de>.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig
2010-10-10 05:36:23 -04:00
committed by Al Viro
parent 9c82ab9c9e
commit 312d3ca856
3 changed files with 35 additions and 20 deletions
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2
kernel/sysctl.c
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@@ -1377,7 +1377,7 @@ static struct ctl_table fs_table[] = {
.data = &dentry_stat,
.maxlen = 6*sizeof(int),
.mode = 0444,
.proc_handler = proc_dointvec,
.proc_handler = proc_nr_dentry,
},
{
.procname = "overflowuid",