From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wu Fengguang <fengguang.wu@intel.com>
Subject: [PATCH 02/12] writeback: account per-bdi accumulated dirtied pages
Date: Sat, 16 Apr 2011 21:25:48 +0800
Message-ID: <20110416134332.667289668@intel.com>
References: <20110416132546.765212221@intel.com>
Cc: Jan Kara <jack@suse.cz>, Michael Rubin <mrubin@google.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Wu Fengguang <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Return-path: <linux-kernel-owner@vger.kernel.org>
CC: Christoph Hellwig <hch@lst.de>
CC: Trond Myklebust <Trond.Myklebust@netapp.com>
CC: Dave Chinner <david@fromorbit.com>
CC: Theodore Ts'o <tytso@mit.edu>
CC: Chris Mason <chris.mason@oracle.com>
CC: Mel Gorman <mel@csn.ul.ie>
CC: Rik van Riel <riel@redhat.com>
CC: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
CC: Greg Thelen <gthelen@google.com>
CC: Minchan Kim <minchan.kim@gmail.com>
CC: Vivek Goyal <vgoyal@redhat.com>
CC: Andrea Righi <arighi@develer.com>
CC: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: linux-mm <linux-mm@kvack.org>
Cc: <linux-fsdevel@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Content-Disposition: inline; filename=writeback-bdi-dirtied.patch
Sender: linux-kernel-owner@vger.kernel.org
List-Id: linux-fsdevel.vger.kernel.org

Introduce the BDI_DIRTIED counter. It will be used for estimating the
bdi's dirty bandwidth.

CC: Jan Kara <jack@suse.cz>
CC: Michael Rubin <mrubin@google.com>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
 include/linux/backing-dev.h |    1 +
 mm/backing-dev.c            |    2 ++
 mm/page-writeback.c         |    1 +
 3 files changed, 4 insertions(+)

--- linux-next.orig/include/linux/backing-dev.h	2011-04-14 09:21:06.000000000 +0800
+++ linux-next/include/linux/backing-dev.h	2011-04-14 21:51:23.000000000 +0800
@@ -40,6 +40,7 @@ typedef int (congested_fn)(void *, int);
 enum bdi_stat_item {
 	BDI_RECLAIMABLE,
 	BDI_WRITEBACK,
+	BDI_DIRTIED,
 	BDI_WRITTEN,
 	NR_BDI_STAT_ITEMS
 };
--- linux-next.orig/mm/page-writeback.c	2011-04-14 09:21:06.000000000 +0800
+++ linux-next/mm/page-writeback.c	2011-04-14 21:51:23.000000000 +0800
@@ -1133,6 +1133,7 @@ void account_page_dirtied(struct page *p
 		__inc_zone_page_state(page, NR_FILE_DIRTY);
 		__inc_zone_page_state(page, NR_DIRTIED);
 		__inc_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
+		__inc_bdi_stat(mapping->backing_dev_info, BDI_DIRTIED);
 		task_dirty_inc(current);
 		task_io_account_write(PAGE_CACHE_SIZE);
 	}
--- linux-next.orig/mm/backing-dev.c	2011-04-14 09:21:06.000000000 +0800
+++ linux-next/mm/backing-dev.c	2011-04-14 21:51:23.000000000 +0800
@@ -86,6 +86,7 @@ static int bdi_debug_stats_show(struct s
 		   "BdiDirtyThresh:   %8lu kB\n"
 		   "DirtyThresh:      %8lu kB\n"
 		   "BackgroundThresh: %8lu kB\n"
+		   "BdiDirtied:       %8lu kB\n"
 		   "BdiWritten:       %8lu kB\n"
 		   "b_dirty:          %8lu\n"
 		   "b_io:             %8lu\n"
@@ -95,6 +96,7 @@ static int bdi_debug_stats_show(struct s
 		   (unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)),
 		   (unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)),
 		   K(bdi_thresh), K(dirty_thresh), K(background_thresh),
+		   (unsigned long) K(bdi_stat(bdi, BDI_DIRTIED)),
 		   (unsigned long) K(bdi_stat(bdi, BDI_WRITTEN)),
 		   nr_dirty, nr_io, nr_more_io,
 		   !list_empty(&bdi->bdi_list), bdi->state);