From: Christoph Hellwig <hch@infradead.org>
Date: Sun, 10 Oct 2010 09:36:23 +0000 (-0400)
Subject: fs: use percpu counter for nr_dentry and nr_dentry_unused
X-Git-Tag: v2.6.37-rc1~94^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=312d3ca856d369bb04d0443846b85b4cdde6fa8a;p=pandora-kernel.git

fs: use percpu counter for nr_dentry and nr_dentry_unused

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>
---

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