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DateMon, 19 Mar 2007 16:57:40 +0100
FromPeter Zijlstra <>
Subject[RFC][PATCH 3/6] mm: count writeback pages per BDI
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
 };
 
--

-
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