Re: [PATCH 03/10] mm: Add support for a filesystem to control swap files
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From: Mel Gorman <hidden>
Date: 2011-09-12 09:34:39
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On Mon, Sep 12, 2011 at 11:04:45AM +0200, Peter Zijlstra wrote:
On Fri, 2011-09-09 at 09:36 -0400, Christoph Hellwig wrote:quoted
The equivalent of ->direct_IO should be used for both reads and writes.So the difference between DIO and swapIO is that swapIO needs the block map pinned in memory.. So at the very least you'll need those swap_{activate,deactivate} aops. The read/write-page thingies could indeed be shared with DIO.
I'm travelling at the moment so it'll be later in the week when I investigate properly but I agree swap_[de|a]ctivate are still necessary. NFS does not need to pin a block map but it's still necessary for calling xs_set_memalloc. -- Mel Gorman SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html