linux-kernel - [PATCH 1/6] fs: Introduce a per_cpu nr

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Message-ID: <492DDC0B.8060804@cosmosbay.com>
Date:	Thu, 27 Nov 2008 00:30:19 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	David Miller <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org, Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>
Subject: [PATCH 1/6] fs: Introduce a per_cpu nr_dentry

Adding a per_cpu nr_dentry avoids cache line ping pongs between
cpus to maintain this metric.

We centralize decrements of nr_dentry in d_free(),
and increments in d_alloc().

d_alloc() can avoid taking dcache_lock if parent is NULL

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
---
 fs/dcache.c        |   55 ++++++++++++++++++++++++++++---------------
 include/linux/fs.h |    2 +
 kernel/sysctl.c    |    2 -
 3 files changed, 40 insertions(+), 19 deletions(-)

View attachment "per_cpu_nr_dentry.patch" of type "text/plain" (4783 bytes)