The delay incurred in lock_page() should also be accounted in swap delay
accounting
Reported-by: NNick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: NBalbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>