linux-kernel - [PATCH v2 2/5] fs: Use a percpu_counter to track nr

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Date:	Sat, 29 Nov 2008 09:43:39 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Ingo Molnar <mingo@...e.hu>, Christoph Hellwig <hch@...radead.org>
CC:	David Miller <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	"kernel-testers@...r.kernel.org >> Kernel Testers List" 
	<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>,
	linux-fsdevel@...r.kernel.org, Al Viro <viro@...IV.linux.org.uk>
Subject: [PATCH v2 2/5] fs: Use a percpu_counter to track nr_inodes

Avoids cache line ping pongs between cpus and prepare next patch,
because updates of nr_inodes dont need inode_lock anymore.

(socket8 bench result : no difference at this point)

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
---
 fs/fs-writeback.c   |    2 +-
 fs/inode.c          |   39 +++++++++++++++++++++++++++++++--------
 include/linux/fs.h  |    3 +++
 kernel/sysctl.c     |    4 ++--
 mm/page-writeback.c |    2 +-
 5 files changed, 38 insertions(+), 12 deletions(-)

View attachment "nr_inodes.patch" of type "text/plain" (5627 bytes)