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mm: add cond_resched() to generic_swapfile_activate()

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generic_swapfile_activate() can take quite long time, it iterates over
all blocks of a file, so add cond_resched to it.  I observed about 1
second stalls when activating a swapfile that was almost unfragmented -
this patch fixes it.

Link: http://lkml.kernel.org/r/alpine.LRH.2.02.1607221710580.4818@file01.intranet.prod.int.rdu2.redhat.com
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mikulas Patocka 2016-07-28 15:48:47 -07:00 committed by Linus Torvalds
parent 4e390b2b2f
commit 7e4411bfe6
1 changed files with 2 additions and 0 deletions
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2
mm/page_io.c
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@ -166,6 +166,8 @@ int generic_swapfile_activate(struct swap_info_struct *sis,
unsigned block_in_page;
sector_t first_block;
cond_resched();
first_block = bmap(inode, probe_block);
if (first_block == 0)
goto bad_bmap;