From: Wu Fengguang <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Jan Kara <jack@suse.cz>, Peter Zijlstra <a.p.zijlstra@chello.nl>,
Wu Fengguang <fengguang.wu@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: <linux-fsdevel@vger.kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 11/18] writeback: add bdi_dirty_limit() kernel-doc
Date: Tue, 24 May 2011 13:14:22 +0800 [thread overview]
Message-ID: <20110524051859.591227629@intel.com> (raw)
In-Reply-To: 20110524051411.924582719@intel.com
[-- Attachment #1: writeback-task_dirty_limit-comment.patch --]
[-- Type: text/plain, Size: 1193 bytes --]
Clarify the bdi_dirty_limit() comment.
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
mm/page-writeback.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- linux-next.orig/mm/page-writeback.c 2011-05-24 11:17:14.000000000 +0800
+++ linux-next/mm/page-writeback.c 2011-05-24 11:17:23.000000000 +0800
@@ -437,10 +437,17 @@ void global_dirty_limits(unsigned long *
*pdirty = dirty;
}
-/*
+/**
* bdi_dirty_limit - @bdi's share of dirty throttling threshold
+ * @bdi: the backing_dev_info to query
+ * @dirty: global dirty limit in pages
+ *
+ * Returns @bdi's dirty limit in pages. The term "dirty" in the context of
+ * dirty balancing includes all PG_dirty, PG_writeback and NFS unstable pages.
+ * And the "limit" in the name is not seriously taken as hard limit in
+ * balance_dirty_pages().
*
- * Allocate high/low dirty limits to fast/slow devices, in order to prevent
+ * It allocates high/low dirty limits to fast/slow devices, in order to prevent
* - starving fast devices
* - piling up dirty pages (that will take long time to sync) on slow devices
*
next prev parent reply other threads:[~2011-05-24 5:25 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-24 5:14 [PATCH 00/18] writeback fixes and cleanups for 2.6.40 (v4) Wu Fengguang
2011-05-24 5:14 ` [PATCH 01/18] writeback: introduce .tagged_writepages for the WB_SYNC_NONE sync stage Wu Fengguang
2011-05-24 5:14 ` [PATCH 02/18] writeback: update dirtied_when for synced inode to prevent livelock Wu Fengguang
2011-05-24 5:14 ` [PATCH 03/18] writeback: introduce writeback_control.inodes_cleaned Wu Fengguang
2011-05-24 5:14 ` [PATCH 04/18] writeback: try more writeback as long as something was written Wu Fengguang
2011-05-24 5:14 ` [PATCH 05/18] writeback: the kupdate expire timestamp should be a moving target Wu Fengguang
2011-05-24 5:14 ` [PATCH 06/18] writeback: sync expired inodes first in background writeback Wu Fengguang
2011-05-24 15:52 ` Jan Kara
2011-05-25 14:38 ` Wu Fengguang
2011-05-26 23:10 ` Jan Kara
2011-05-27 15:06 ` Wu Fengguang
2011-05-27 15:17 ` Wu Fengguang
2011-05-24 5:14 ` [PATCH 07/18] writeback: refill b_io iff empty Wu Fengguang
2011-05-24 5:14 ` [PATCH 08/18] writeback: split inode_wb_list_lock into bdi_writeback.list_lock Wu Fengguang
2011-05-24 5:14 ` [PATCH 09/18] writeback: elevate queue_io() into wb_writeback() Wu Fengguang
2011-05-24 5:14 ` [PATCH 10/18] writeback: avoid extra sync work at enqueue time Wu Fengguang
2011-05-24 5:14 ` Wu Fengguang [this message]
2011-05-24 5:14 ` [PATCH 12/18] writeback: skip balance_dirty_pages() for in-memory fs Wu Fengguang
2011-05-24 5:14 ` [PATCH 13/18] writeback: remove writeback_control.more_io Wu Fengguang
2011-05-24 5:14 ` [PATCH 14/18] writeback: remove .nonblocking and .encountered_congestion Wu Fengguang
2011-05-24 5:14 ` [PATCH 15/18] writeback: trace event writeback_single_inode Wu Fengguang
2011-05-24 5:14 ` [PATCH 16/18] writeback: trace event writeback_queue_io Wu Fengguang
2011-05-24 5:14 ` [PATCH 17/18] writeback: make writeback_control.nr_to_write straight Wu Fengguang
2011-05-24 5:14 ` [PATCH 18/18] writeback: rearrange the wb_writeback() loop Wu Fengguang
2011-05-29 7:34 ` [PATCH 00/18] writeback fixes and cleanups for 2.6.40 (v4) Sedat Dilek
2011-05-29 7:34 ` Sedat Dilek
-- strict thread matches above, loose matches on Subject: below --
2011-05-19 21:45 [PATCH 00/18] writeback fixes and cleanups for 2.6.40 (v3) Wu Fengguang
2011-05-19 21:45 ` [PATCH 11/18] writeback: add bdi_dirty_limit() kernel-doc Wu Fengguang
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