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>

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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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fs/dcache.c

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