linux-kernel - Re: [PATCH 14/14] tmpfs: no need to use i

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Date:	Tue, 31 May 2011 09:08:10 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 14/14] tmpfs: no need to use i_lock

On Mon, 2011-05-30 at 17:55 -0700, Hugh Dickins wrote:
> 2.6.36's 7e496299d4d2 to make tmpfs scalable with percpu_counter used
> inode->i_lock in place of sbinfo->stat_lock around i_blocks updates;
> but that was adverse to scalability, and unnecessary, since info->lock
> is already held there in the fast paths.
> 
> Remove those uses of i_lock, and add info->lock in the three error
> paths where it's then needed across shmem_free_blocks().  It's not
> actually needed across shmem_unacct_blocks(), but they're so often
> paired that it looks wrong to split them apart.
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>
> Cc: Tim Chen <tim.c.chen@...ux.intel.com>
> ---

Acked.  

Tim Chen



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