The patch titled
Subject: mm: add cond_resched() to generic_swapfile_activate()
has been added to the -mm tree. Its filename is
mm-add-cond_resched-to-generic_swapfile_activate.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-add-cond_resched-to-generic_swapfile_activate.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-cond_resched-to-generic_swapfile_activate.patch
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------------------------------------------------------
From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Subject: mm: add cond_resched() to generic_swapfile_activate()
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@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_io.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/page_io.c~mm-add-cond_resched-to-generic_swapfile_activate mm/page_io.c
--- a/mm/page_io.c~mm-add-cond_resched-to-generic_swapfile_activate
+++ a/mm/page_io.c
@@ -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;
_
Patches currently in -mm which might be from mpatocka@xxxxxxxxxx are
mm-add-cond_resched-to-generic_swapfile_activate.patch
mm-optimize-copy_page_to-from_iter_iovec.patch
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