diff options
author | Minchan Kim <minchan@kernel.org> | 2017-05-03 14:54:17 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-03 15:52:10 -0700 |
commit | 33fc80e2574737e6e21eecc4c1d7942370a2c752 (patch) | |
tree | ee10306d5b2bf35138563377b7f77d89e689855f /mm/vmscan.c | |
parent | ad6b67041a45497261617d7a28b15159b202cb5a (diff) | |
download | linux-33fc80e2574737e6e21eecc4c1d7942370a2c752.tar.gz |
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.c | 2 |
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 */ } |