From: Wu Fengguang <fengguang.wu@intel.com>
To: linux-mm <linux-mm@kvack.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Wu Fengguang <fengguang.wu@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Theodore Ts'o <tytso@mit.edu>, Dave Chinner <david@fromorbit.com>,
Jan Kara <jack@suse.cz>, Mel Gorman <mel@csn.ul.ie>,
Rik van Riel <riel@redhat.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Chris Mason <chris.mason@oracle.com>,
Christoph Hellwig <hch@lst.de>, Li Shaohua <shaohua.li@intel.com>
Subject: [PATCH 06/17] writeback: move task dirty fraction to balance_dirty_pages()
Date: Sun, 12 Sep 2010 23:49:51 +0800 [thread overview]
Message-ID: <20100912155203.524811417@intel.com> (raw)
In-Reply-To: 20100912154945.758129106@intel.com
[-- Attachment #1: writeback-task-weight.patch --]
[-- Type: text/plain, Size: 1990 bytes --]
This is simple code refactor preparing for a trace event that exposes
the fraction info. It may be merged with the next patch eventually.
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
mm/page-writeback.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- linux-next.orig/mm/page-writeback.c 2010-09-09 16:02:27.000000000 +0800
+++ linux-next/mm/page-writeback.c 2010-09-09 16:02:30.000000000 +0800
@@ -260,14 +260,12 @@ static inline void task_dirties_fraction
* effectively curb the growth of dirty pages. Light dirtiers with high enough
* dirty threshold may never get throttled.
*/
-static unsigned long task_dirty_limit(struct task_struct *tsk,
- unsigned long bdi_dirty)
+static unsigned long task_dirty_limit(unsigned long bdi_dirty,
+ long numerator, long denominator)
{
- long numerator, denominator;
unsigned long dirty = bdi_dirty;
u64 inv = dirty / DIRTY_SOFT_THROTTLE_RATIO;
- task_dirties_fraction(tsk, &numerator, &denominator);
inv *= numerator;
do_div(inv, denominator);
@@ -472,6 +470,7 @@ static void balance_dirty_pages(struct a
unsigned long bw;
bool dirty_exceeded = false;
struct backing_dev_info *bdi = mapping->backing_dev_info;
+ long numerator, denominator;
for (;;) {
/*
@@ -496,8 +495,10 @@ static void balance_dirty_pages(struct a
(background_thresh + dirty_thresh) / 2)
break;
+ task_dirties_fraction(current, &numerator, &denominator);
bdi_thresh = bdi_dirty_limit(bdi, dirty_thresh);
- bdi_thresh = task_dirty_limit(current, bdi_thresh);
+ bdi_thresh = task_dirty_limit(bdi_thresh,
+ numerator, denominator);
/*
* In order to avoid the stacked BDI deadlock we need
--
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next prev parent reply other threads:[~2010-09-12 15:55 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-12 15:49 [PATCH 00/17] [RFC] soft and dynamic dirty throttling limits Wu Fengguang
2010-09-12 15:49 ` [PATCH 01/17] writeback: remove the internal 5% low bound on dirty_ratio Wu Fengguang
2010-09-13 9:23 ` Johannes Weiner
2010-09-13 9:51 ` Mel Gorman
2010-09-13 9:57 ` Wu Fengguang
2010-09-13 10:10 ` Mel Gorman
2010-09-12 15:49 ` [PATCH 02/17] writeback: IO-less balance_dirty_pages() Wu Fengguang
2010-09-13 8:45 ` Dave Chinner
2010-09-13 11:38 ` Wu Fengguang
2010-09-12 15:49 ` [PATCH 03/17] writeback: per-task rate limit to balance_dirty_pages() Wu Fengguang
2010-09-12 15:49 ` [PATCH 04/17] writeback: quit throttling when bdi dirty/writeback pages go down Wu Fengguang
2010-09-12 15:49 ` [PATCH 05/17] writeback: quit throttling when signal pending Wu Fengguang
2010-09-12 20:46 ` Neil Brown
2010-09-13 1:55 ` Wu Fengguang
2010-09-13 3:21 ` Neil Brown
2010-09-13 3:48 ` Wu Fengguang
2010-09-14 8:23 ` KOSAKI Motohiro
2010-09-14 8:33 ` Wu Fengguang
2010-09-14 8:44 ` KOSAKI Motohiro
2010-09-14 9:17 ` Wu Fengguang
2010-09-14 9:25 ` KOSAKI Motohiro
2010-09-12 15:49 ` Wu Fengguang [this message]
2010-09-12 15:49 ` [PATCH 07/17] writeback: add trace event for balance_dirty_pages() Wu Fengguang
2010-09-12 15:49 ` [PATCH 08/17] writeback: account per-bdi accumulated written pages Wu Fengguang
2010-09-12 15:59 ` Wu Fengguang
2010-09-14 8:32 ` KOSAKI Motohiro
2010-09-12 15:49 ` [PATCH 09/17] writeback: bdi write bandwidth estimation Wu Fengguang
2010-09-12 15:49 ` [PATCH 10/17] writeback: show bdi write bandwidth in debugfs Wu Fengguang
2010-09-12 15:49 ` [PATCH 11/17] writeback: make nr_to_write a per-file limit Wu Fengguang
2010-09-12 15:49 ` [PATCH 12/17] writeback: scale IO chunk size up to device bandwidth Wu Fengguang
2010-09-12 15:49 ` [PATCH 13/17] writeback: reduce per-bdi dirty threshold ramp up time Wu Fengguang
2010-09-12 16:15 ` Wu Fengguang
2010-09-12 15:49 ` [PATCH 14/17] vmscan: add scan_control.priority Wu Fengguang
2010-09-12 15:50 ` [PATCH 15/17] mm: lower soft dirty limits on memory pressure Wu Fengguang
2010-09-13 9:40 ` Wu Fengguang
2010-09-12 15:50 ` [PATCH 16/17] mm: create /vm/dirty_pressure in debugfs Wu Fengguang
2010-09-12 15:50 ` [PATCH 17/17] writeback: consolidate balance_dirty_pages() variable names Wu Fengguang
2010-10-12 14:17 ` [PATCH 00/17] [RFC] soft and dynamic dirty throttling limits Christoph Hellwig
2010-10-13 3:07 ` Dave Chinner
2010-10-13 3:23 ` Wu Fengguang
2010-10-13 8:26 ` Wu Fengguang
2010-10-13 9:26 ` Dave Chinner
2010-11-01 6:24 ` Dave Chinner
2010-11-04 3:41 ` Wu Fengguang
2010-11-04 12:48 ` Dave Chinner
2010-11-04 13:12 ` Christoph Hellwig
2010-11-05 14:56 ` Wu Fengguang
2010-11-06 10:42 ` Dave Chinner
2010-10-14 13:12 ` Wu Fengguang
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