[PATCHv3 4/6] mm: allow for outstanding swap writeback accounting

[Minchan Kim]

On Mon, Jan 28, 2013 at 03:49:25PM -0600, Seth Jennings wrote:
> To prevent flooding the swap device with writebacks, frontswap
> backends need to count and limit the number of outstanding
> writebacks.  The incrementing of the counter can be done before
> the call to __swap_writepage().  However, the caller must receive
> a notification when the writeback completes in order to decrement
> the counter.
> 
> To achieve this functionality, this patch modifies
> __swap_writepage() to take the bio completion callback function
> as an argument.
> 
> end_swap_bio_write(), the normal bio completion function, is also
> made non-static so that code doing the accounting can call it
> after the accounting is done.
> 
> Signed-off-by: Seth Jennings <sjenning at linux.vnet.ibm.com>
Acked-by: Minchan Kim <minchan at kernel.org>

-- 
Kind regards,
Minchan Kim