Count per BDI writeback pages.
Signed-off-by: Peter Zijlstra <[EMAIL PROTECTED]>
---
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
@@ -981,10 +981,12 @@ 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);
@@ -1004,10 +1006,12 @@ 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
@@ -25,6 +25,7 @@ enum bdi_state {
enum bdi_stat_item {
BDI_DIRTY,
+ BDI_WRITEBACK,
NR_BDI_STAT_ITEMS
};
--
-
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