Shaohua Li reported parallel file copy on tmpfs can lead to OOM killer. This is regression of caused by commit 9ff473b9a7 (vmscan: evict streaming IO first). Wow, It is 2 years old patch! Currently, tmpfs file cache is inserted active list at first. It mean the insertion doesn't only increase numbers of pages in anon LRU, but also reduce anon scanning ratio. Therefore, vmscan will get totally confusion. It scan almost only file LRU even though the system have plenty unused tmpfs pages. Historically, lru_cache_add_active_anon() was used by two reasons. 1) Intend to priotize shmem page rather than regular file cache. 2) Intend to avoid reclaim priority inversion of used once pages. But we've lost both motivation because (1) Now we have separate anon and file LRU list. then, to insert active list doesn't help such priotize. (2) In past, one pte access bit will cause page activation. then to insert inactive list with pte access bit mean higher priority than to insert active list. Its priority inversion may lead to uninteded lru chun. but it was already solved by commit 645747462 (vmscan: detect mapped file pages used only once). (Thanks Hannes, you are great!) Thus, now we can use lru_cache_add_anon() instead. Reported-by: Shaohua Li <shaohua.li@xxxxxxxxx> Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Minchan Kim <minchan.kim@xxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> --- mm/filemap.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/mm/filemap.c b/mm/filemap.c index b941996..023ef61 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -452,7 +452,7 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping, if (page_is_file_cache(page)) lru_cache_add_file(page); else - lru_cache_add_active_anon(page); + lru_cache_add_anon(page); } return ret; } -- 1.6.5.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>