linux-kernel - Re: [PATCHv4 1/3] fs.c: support buffer cache allocations with gfp modifiers

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Date:	Thu, 4 Sep 2014 22:37:28 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Gioh Kim <gioh.kim@....com>
Cc:	akpm@...ux-foundation.org, jack@...e.cz,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
	adilger.kernel@...ger.ca, minchan@...nel.org, js1304@...il.com,
	gunho.lee@....com
Subject: Re: [PATCHv4 1/3] fs.c: support buffer cache allocations with gfp
 modifiers

On Thu, Sep 04, 2014 at 04:29:39PM +0900, Gioh Kim wrote:
> A buffer cache is allocated from movable area
> because it is referred for a while and released soon.
> But some filesystems are taking buffer cache for a long time
> and it can disturb page migration.
> 
> New APIs are introduced to allocate buffer cache
> with user specific flag.
> *_gfp APIs are for user want to set page allocation flag for page cache
> allocation.
> And *_unmovable APIs are for the user wants to allocate page cache from
> non-movable area.
> 
> Signed-off-by: Gioh Kim <gioh.kim@....com>
> Reviewed-by: Jan Kara <jack@...e.cz>

Thanks, I've applied this to the ext4 git tree with a slightly
rewritten commit description (for clarity).

						- Ted
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