linux-kernel - [PATCH 4/6] fs: Introduce a per_cpu nr

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Date:	Thu, 27 Nov 2008 00:32:33 +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 4/6] fs: Introduce a per_cpu nr_inodes

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

(socket8 bench result : 25s to 20.5s)

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
---
 fs/fs-writeback.c   |    2 -
 fs/inode.c          |   51 +++++++++++++++++++++++++++++++++++-------
 include/linux/fs.h  |    3 ++
 kernel/sysctl.c     |    4 +--
 mm/page-writeback.c |    2 -
 5 files changed, 50 insertions(+), 12 deletions(-)


View attachment "per_cpu_nr_inodes.patch" of type "text/plain" (5706 bytes)