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authorMinchan Kim <minchan@kernel.org>2017-05-04 00:54:17 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-04 01:52:10 +0300
commit33fc80e2574737e6e21eecc4c1d7942370a2c752 (patch)
treeee10306d5b2bf35138563377b7f77d89e689855f /mm/vmscan.c
parentad6b67041a45497261617d7a28b15159b202cb5a (diff)
downloadlinux-33fc80e2574737e6e21eecc4c1d7942370a2c752.tar.xz
mm: remove SWAP_AGAIN in ttu
In 2002, [1] introduced SWAP_AGAIN. At that time, try_to_unmap_one used spin_trylock(&mm->page_table_lock) so it's really easy to contend and fail to hold a lock so SWAP_AGAIN to keep LRU status makes sense. However, now we changed it to mutex-based lock and be able to block without skip pte so there is few of small window to return SWAP_AGAIN so remove SWAP_AGAIN and just return SWAP_FAIL. [1] c48c43e, minimal rmap Link: http://lkml.kernel.org/r/1489555493-14659-7-git-send-email-minchan@kernel.org Signed-off-by: Minchan Kim <minchan@kernel.org> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index cfd2651966a8..f80a54da5f7f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1150,8 +1150,6 @@ static unsigned long shrink_page_list(struct list_head *page_list,
case SWAP_FAIL:
nr_unmap_fail++;
goto activate_locked;
- case SWAP_AGAIN:
- goto keep_locked;
case SWAP_SUCCESS:
; /* try to free the page below */
}