linux-kernel - Re: [PATCH 3/7] [v2] zram/xvmalloc: free bit block insertion optimization

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Date:	Sat, 29 Jan 2011 10:48:18 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Robert Jennings <rcj@...ux.vnet.ibm.com>
Cc:	Nitin Gupta <ngupta@...are.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/7] [v2] zram/xvmalloc: free bit block insertion
 optimization

On Fri, 2011-01-28 at 08:58 -0600, Robert Jennings wrote:
> This change is in a conditional block which is entered only when there is
> an existing data block on the freelist where the insert has taken place.
> 
> The new block is pushed onto the freelist stack and this conditional block
> is updating links in the prior stack head to point to the new stack head.
> After this conditional block the first-/second-level indices are updated
> to indicate that there is a free block at this location.
> 
> This patch adds an immediate return from the conditional block to avoid
> setting bits again to indicate a free block on this freelist. The bits
> would already be set because there was an existing free block on this
> freelist.
> 
> Signed-off-by: Robert Jennings <rcj@...ux.vnet.ibm.com>

Reviewed-by: Pekka Enberg <penberg@...nel.org>

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