netdev - Re: [PATCH] vfs: dont chain pipe/anon/socket on superblock s

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Date:	Tue, 26 Jul 2011 12:43:33 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Tim Chen <tim.c.chen@...ux.intel.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	David Miller <davem@...emloft.net>,
	Andi Kleen <andi@...stfloor.org>,
	Matthew Wilcox <matthew@....cx>,
	Anton Blanchard <anton@...ba.org>, npiggin@...nel.dk,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] vfs: dont chain pipe/anon/socket on superblock
 s_inodes list

Le mardi 26 juillet 2011 à 05:42 -0400, Christoph Hellwig a écrit :
> On Tue, Jul 26, 2011 at 11:36:34AM +0200, Eric Dumazet wrote:
> > [PATCH v2] vfs: dont chain pipe/anon/socket on superblock s_inodes list
> > 
> > Workloads using pipes and sockets hit inode_sb_list_lock contention.
> > 
> > superblock s_inodes list is needed for quota, dirty, pagecache and
> > fsnotify management. pipe/anon/socket fs are clearly not candidates for
> > these.
> > 
> > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> 
> Looks good to me,
> 
> Reviewed-by: Christoph Hellwig <hch@....de>
> 

Thanks !

BTW, we have one atomic op that could be avoided in new_inode()

spin_lock(&inode->i_lock);
inode->i_state = 0;
spin_unlock(&inode->i_lock);

can probably be changed to something less expensive...

inode->i_state = 0;
smp_wmb();

Not clear if we really need a memory barrier either....



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