diff options
| author | Johannes Weiner <hannes@cmpxchg.org> | 2011-02-01 15:52:44 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-02-02 16:03:19 -0800 |
| commit | 8493ae439f7038b502df1d687e61dde54c27ca92 (patch) | |
| tree | ba8dafa7eb3292c8d2ca4597ef6f2f06c7dcd6a6 /mm/memcontrol.c | |
| parent | 19942822df65ee4a47c2e6d6d70cace1b7f01710 (diff) | |
| download | lwn-8493ae439f7038b502df1d687e61dde54c27ca92.tar.gz lwn-8493ae439f7038b502df1d687e61dde54c27ca92.zip | |
memcg: never OOM when charging huge pages
Huge page coverage should obviously have less priority than the continued
execution of a process.
Never kill a process when charging it a huge page fails. Instead, give up
after the first failed reclaim attempt and fall back to regular pages.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 0e81eb5f0aea..fc75f34ba609 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2351,13 +2351,19 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, gfp_t gfp_mask, enum charge_type ctype) { struct mem_cgroup *mem = NULL; + int page_size = PAGE_SIZE; struct page_cgroup *pc; + bool oom = true; int ret; - int page_size = PAGE_SIZE; if (PageTransHuge(page)) { page_size <<= compound_order(page); VM_BUG_ON(!PageTransHuge(page)); + /* + * Never OOM-kill a process for a huge page. The + * fault handler will fall back to regular pages. + */ + oom = false; } pc = lookup_page_cgroup(page); @@ -2366,7 +2372,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, return 0; prefetchw(pc); - ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true, page_size); + ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, oom, page_size); if (ret || !mem) return ret; |