Re: [PATCH] vfs: dont chain pipe/anon/socket on superblocks_inodes list

[Eric Dumazet]

Le mardi 26 juillet 2011 Ã 05:42 -0400, Christoph Hellwig a Ãcrit :
> 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@xxxxxxxxx>
> 
> Looks good to me,
> 
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> 

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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