From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wu Fengguang Subject: [PATCH 20/47] writeback: use do_div in bw calculation Date: Mon, 13 Dec 2010 14:43:09 +0800 Message-ID: <20101213064839.406113721@intel.com> References: <20101213064249.648862451@intel.com> Cc: Jan Kara , Peter Zijlstra , Wu Fengguang To: Andrew Morton Return-path: Received: from mga14.intel.com ([143.182.124.37]:5009 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932192Ab0LMGtt (ORCPT ); Mon, 13 Dec 2010 01:49:49 -0500 CC: Christoph Hellwig CC: Trond Myklebust CC: Dave Chinner CC: Theodore Ts'o CC: Chris Mason CC: Mel Gorman CC: Rik van Riel CC: KOSAKI Motohiro CC: Greg Thelen CC: Minchan Kim Cc: linux-mm Cc: Cc: LKML Content-Disposition: inline; filename=writeback-use-do_div.patch Sender: linux-fsdevel-owner@vger.kernel.org List-ID: cc: Peter Zijlstra Signed-off-by: Wu Fengguang --- mm/page-writeback.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- linux-next.orig/mm/page-writeback.c 2010-12-08 22:44:28.000000000 +0800 +++ linux-next/mm/page-writeback.c 2010-12-08 22:44:28.000000000 +0800 @@ -658,10 +658,10 @@ static void balance_dirty_pages(struct a */ bw = bdi->write_bandwidth; bw = bw * (bdi_thresh - bdi_dirty); - bw = bw / (bdi_thresh / BDI_SOFT_DIRTY_LIMIT + 1); + do_div(bw, bdi_thresh / BDI_SOFT_DIRTY_LIMIT + 1); bw = bw * (task_thresh - bdi_dirty); - bw = bw / (bdi_thresh / TASK_SOFT_DIRTY_LIMIT + 1); + do_div(bw, bdi_thresh / TASK_SOFT_DIRTY_LIMIT + 1); pause = HZ * (pages_dirtied << PAGE_CACHE_SHIFT) / (bw + 1); pause = clamp_val(pause, 1, HZ/10);