linux-ext4 - Re: [PATCH 1/3] jbd2: allocate transaction from special cache

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Message-ID: <20120213221020.GB21641@thunk.org>
Date:	Mon, 13 Feb 2012 17:10:20 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Yongqiang Yang <xiaoqiangnk@...il.com>
Cc:	linux-ext4@...r.kernel.org, Manish Katiyar <mkatiyar@...il.com>
Subject: Re: [PATCH 1/3] jbd2: allocate transaction from special cache

On Sun, Nov 13, 2011 at 07:21:29PM +0800, Yongqiang Yang wrote:
> transaction_t is 136 byes under 32-bit systems. If we allocate
> it from general cache, it comsumes 256 bytes.  So let jbd2 allocate
> it from special cache to reduce memory consumption.
> 
> Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>

Thanks, applied with a modified description:

    jbd2: allocate transaction from separate slab cache
    
    There is normally only a handful of these active at any one time, but
    putting them in a separate slab cache makes debugging memory
    corruption problems easier.  Manish Katiyar also wanted this make it
    easier to test memory failure scenarios in the jbd2 layer.

    	      	   	  	  	       - Ted
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