linux-kernel - [BUGFIX][PATCH 3/4] mecg: fix oom flag at THP charge

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Date:	Fri, 28 Jan 2011 12:27:29 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>
Subject: [BUGFIX][PATCH 3/4] mecg: fix oom flag at THP charge


Thanks to Johanns and Daisuke for suggestion.
=
Hugepage allocation shouldn't trigger oom.
Allocation failure is not fatal.

Orignal-patch-by: Johannes Weiner <hannes@...xchg.org>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 mm/memcontrol.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Index: mmotm-0125/mm/memcontrol.c
===================================================================
--- mmotm-0125.orig/mm/memcontrol.c
+++ mmotm-0125/mm/memcontrol.c
@@ -2369,11 +2369,14 @@ static int mem_cgroup_charge_common(stru
 	struct page_cgroup *pc;
 	int ret;
 	int page_size = PAGE_SIZE;
+	bool oom;
 
 	if (PageTransHuge(page)) {
 		page_size <<= compound_order(page);
 		VM_BUG_ON(!PageTransHuge(page));
-	}
+		oom = false;
+	} else
+		oom = true;
 
 	pc = lookup_page_cgroup(page);
 	/* can happen at boot */
@@ -2381,7 +2384,7 @@ static int mem_cgroup_charge_common(stru
 		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;
 

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