Home Home > GIT Browse > vanilla
summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorSteven Rostedt <rostedt@goodmis.org>2016-07-14 17:55:21 -0400
committerSasha Levin <alexander.levin@verizon.com>2016-07-19 15:49:46 -0400
commit74225a4cbea38034034add5da67a2f7ee23251c0 (patch)
treee060cfec15639510c27bda9b54807ace01377b81
parent62d7a4540e294d77c7c758ce7cd73264ba461fa8 (diff)
4.1.28 Fix bad backport of 8f182270dfec "mm/swap.c: flush lru pvecs on compound page arrival"
When I pulled in 4.1.28 into my stable 4.1-rt tree and ran the tests, it crashed with a severe OOM killing everything. I then tested 4.1.28 without -rt and it had the same issue. I did a bisect between 4.1.27 and 4.1.28 and found that the bug started at: commit 8f182270dfec "mm/swap.c: flush lru pvecs on compound page arrival" Looking at that patch and what's in mainline, I see that there's a mismatch in one of the hunks: Mainline: @@ -391,9 +391,8 @@ static void __lru_cache_add(struct page *page) struct pagevec *pvec = &get_cpu_var(lru_add_pvec); get_page(page); - if (!pagevec_space(pvec)) + if (!pagevec_add(pvec, page) || PageCompound(page)) __pagevec_lru_add(pvec); - pagevec_add(pvec, page); put_cpu_var(lru_add_pvec); } Stable 4.1.28: @@ -631,9 +631,8 @@ static void __lru_cache_add(struct page *page) struct pagevec *pvec = &get_cpu_var(lru_add_pvec); page_cache_get(page); - if (!pagevec_space(pvec)) + if (!pagevec_space(pvec) || PageCompound(page)) __pagevec_lru_add(pvec); - pagevec_add(pvec, page); put_cpu_var(lru_add_pvec); } Where mainline replace pagevec_space() with pagevec_add, and stable did not. Fixing this makes the OOM go away. Note, 3.18 has the same bug. Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
-rw-r--r--mm/swap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/swap.c b/mm/swap.c
index b523f0a4cbfb..ab3b9c2dd783 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -631,7 +631,7 @@ static void __lru_cache_add(struct page *page)
struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
page_cache_get(page);
- if (!pagevec_space(pvec) || PageCompound(page))
+ if (!pagevec_add(pvec, page) || PageCompound(page))
__pagevec_lru_add(pvec);
put_cpu_var(lru_add_pvec);
}