On Fri 22-07-16 17:11:20, Mikulas Patocka wrote: > The function 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. > > Signed-off-by: Mikulas Patocka <mpato...@redhat.com>
Acked-by: Michal Hocko <mho...@suse.com> > > --- > mm/page_io.c | 2 ++ > 1 file changed, 2 insertions(+) > > Index: linux-4.7-rc7/mm/page_io.c > =================================================================== > --- linux-4.7-rc7.orig/mm/page_io.c 2016-05-30 17:34:37.000000000 +0200 > +++ linux-4.7-rc7/mm/page_io.c 2016-07-11 17:23:33.000000000 +0200 > @@ -166,6 +166,8 @@ int generic_swapfile_activate(struct swa > unsigned block_in_page; > sector_t first_block; > > + cond_resched(); > + > first_block = bmap(inode, probe_block); > if (first_block == 0) > goto bad_bmap; -- Michal Hocko SUSE Labs
