linux-kernel - [PATCH] Swap delay accounting, include lock

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Date:	Wed, 31 Oct 2007 13:22:43 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Linux MM Mailing List <linux-mm@...ck.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] Swap delay accounting, include lock_page() delays



Reported-by: Nick Piggin <nickpiggin@...oo.com.au>

The delay incurred in lock_page() should also be accounted in swap delay
accounting

Signed-off-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
---

 mm/memory.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN mm/swapfile.c~fix-delay-accounting-swap-accounting mm/swapfile.c
diff -puN mm/memory.c~fix-delay-accounting-swap-accounting mm/memory.c
--- linux-2.6-latest/mm/memory.c~fix-delay-accounting-swap-accounting	2007-10-31 12:58:05.000000000 +0530
+++ linux-2.6-latest-balbir/mm/memory.c	2007-10-31 13:02:50.000000000 +0530
@@ -2084,9 +2084,9 @@ static int do_swap_page(struct mm_struct
 		count_vm_event(PGMAJFAULT);
 	}
 
-	delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
 	mark_page_accessed(page);
 	lock_page(page);
+	delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
 
 	/*
 	 * Back out if somebody else already faulted in this pte.
_

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
-
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