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From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org, neilb@suse.de, dgc@sgi.com,
	tomoki.sekiyama.qu@hitachi.com, a.p.zijlstra@chello.nl
Subject: [RFC][PATCH 3/6] mm: count writeback pages per BDI
Date: Mon, 19 Mar 2007 16:57:40 +0100	[thread overview]
Message-ID: <20070319164320.127815453@programming.kicks-ass.net> (raw)
In-Reply-To: <20070319155737.653325176@programming.kicks-ass.net>

[-- Attachment #1: bdi_stat_writeback.patch --]
[-- Type: text/plain, Size: 1629 bytes --]

Count per BDI writeback pages.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
 include/linux/backing-dev.h |    1 +
 mm/page-writeback.c         |    8 ++++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

Index: linux-2.6/mm/page-writeback.c
===================================================================
--- linux-2.6.orig/mm/page-writeback.c
+++ linux-2.6/mm/page-writeback.c
@@ -912,10 +912,12 @@ int test_clear_page_writeback(struct pag
 
 		write_lock_irqsave(&mapping->tree_lock, flags);
 		ret = TestClearPageWriteback(page);
-		if (ret)
+		if (ret) {
 			radix_tree_tag_clear(&mapping->page_tree,
 						page_index(page),
 						PAGECACHE_TAG_WRITEBACK);
+			__dec_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK);
+		}
 		write_unlock_irqrestore(&mapping->tree_lock, flags);
 	} else {
 		ret = TestClearPageWriteback(page);
@@ -933,10 +935,12 @@ int test_set_page_writeback(struct page 
 
 		write_lock_irqsave(&mapping->tree_lock, flags);
 		ret = TestSetPageWriteback(page);
-		if (!ret)
+		if (!ret) {
 			radix_tree_tag_set(&mapping->page_tree,
 						page_index(page),
 						PAGECACHE_TAG_WRITEBACK);
+			__inc_bdi_stat(mapping->backing_dev_info, BDI_WRITEBACK);
+		}
 		if (!PageDirty(page))
 			radix_tree_tag_clear(&mapping->page_tree,
 						page_index(page),
Index: linux-2.6/include/linux/backing-dev.h
===================================================================
--- linux-2.6.orig/include/linux/backing-dev.h
+++ linux-2.6/include/linux/backing-dev.h
@@ -24,6 +24,7 @@ enum bdi_state {
 
 enum bdi_stat_item {
 	BDI_DIRTY,
+	BDI_WRITEBACK,
 	NR_BDI_STAT_ITEMS
 };
 

--


  parent reply	other threads:[~2007-03-19 17:52 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-19 15:57 [RFC][PATCH 0/6] per device dirty throttling Peter Zijlstra
2007-03-19 15:57 ` [RFC][PATCH 1/6] mm: scalable bdi statistics counters Peter Zijlstra
2007-03-19 15:57 ` [RFC][PATCH 2/6] mm: count dirty pages per BDI Peter Zijlstra
2007-03-19 15:57 ` Peter Zijlstra [this message]
2007-03-19 15:57 ` [RFC][PATCH 4/6] mm: count unstable " Peter Zijlstra
2007-03-19 15:57 ` [RFC][PATCH 5/6] mm: per device dirty threshold Peter Zijlstra
2007-03-19 15:57 ` [RFC][PATCH 6/6] mm: expose BDI statistics in sysfs Peter Zijlstra
2007-03-19 18:29 ` [RFC][PATCH 0/6] per device dirty throttling Peter Zijlstra
2007-03-19 21:48 ` [RFC][PATCH 7/6] assorted fixes Peter Zijlstra
2007-03-20  7:47 ` [RFC][PATCH 0/6] per device dirty throttling David Chinner
2007-03-20  8:08   ` Peter Zijlstra
2007-03-20  9:38     ` David Chinner
2007-03-20  9:45       ` Peter Zijlstra
2007-03-20 15:38         ` Peter Zijlstra

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