linux-kernel - [PATCH][for -mm] fix accounting in vmscan.c for memory controller

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Message-Id: <20071211112644.221a8dc5.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 11 Dec 2007 11:26:44 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"riel@...hat.com" <riel@...hat.com>
Subject: [PATCH][for -mm] fix accounting in vmscan.c for memory controller

Without this, ALLOCSTALL and PGSCAN_DIRECT increases too much unless
there is no memory shortage.

against 2.6.24-rc4-mm1.

-Kame

==
Some amount of accounting is done while page reclaiming.

Now, there are 2 types of page reclaim (if memory controller is used)
  - global: shortage of (global) pages.
  - under cgroup: use up to limit.

I think 2 accountings, ALLOCSTALL and DIRECT should be accounted only under
global lru scan. They are accounted against memory shortage at alloc_pages().

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

 mm/vmscan.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: linux-2.6.24-rc4-mm1/mm/vmscan.c
===================================================================
--- linux-2.6.24-rc4-mm1.orig/mm/vmscan.c
+++ linux-2.6.24-rc4-mm1/mm/vmscan.c
@@ -896,8 +896,9 @@ static unsigned long shrink_inactive_lis
 		if (current_is_kswapd()) {
 			__count_zone_vm_events(PGSCAN_KSWAPD, zone, nr_scan);
 			__count_vm_events(KSWAPD_STEAL, nr_freed);
-		} else
+		} else if (scan_global_lru(sc))
 			__count_zone_vm_events(PGSCAN_DIRECT, zone, nr_scan);
+
 		__count_zone_vm_events(PGSTEAL, zone, nr_freed);
 
 		if (nr_taken == 0)
@@ -1333,7 +1334,8 @@ static unsigned long do_try_to_free_page
 	unsigned long lru_pages = 0;
 	int i;
 
-	count_vm_event(ALLOCSTALL);
+	if (scan_global_lru(sc))
+		count_vm_event(ALLOCSTALL);
 	/*
 	 * mem_cgroup will not do shrink_slab.
 	 */

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