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Subject[PATCH 07/12] mm: count dirty pages per BDI
Count per BDI dirty pages.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
fs/buffer.c | 1 +
include/linux/backing-dev.h | 1 +
mm/page-writeback.c | 2 ++
mm/truncate.c | 1 +
4 files changed, 5 insertions(+)

Index: linux-2.6-mm/fs/buffer.c
===================================================================
--- linux-2.6-mm.orig/fs/buffer.c
+++ linux-2.6-mm/fs/buffer.c
@@ -740,6 +740,7 @@ int __set_page_dirty_buffers(struct page
if (page->mapping) { /* Race with truncate? */
if (mapping_cap_account_dirty(mapping)) {
__inc_zone_page_state(page, NR_FILE_DIRTY);
+ __inc_bdi_stat(mapping->backing_dev_info, BDI_DIRTY);
task_io_account_write(PAGE_CACHE_SIZE);
}
radix_tree_tag_set(&mapping->page_tree,
Index: linux-2.6-mm/mm/page-writeback.c
===================================================================
--- linux-2.6-mm.orig/mm/page-writeback.c
+++ linux-2.6-mm/mm/page-writeback.c
@@ -828,6 +828,7 @@ int __set_page_dirty_nobuffers(struct pa
BUG_ON(mapping2 != mapping);
if (mapping_cap_account_dirty(mapping)) {
__inc_zone_page_state(page, NR_FILE_DIRTY);
+ __inc_bdi_stat(mapping->backing_dev_info, BDI_DIRTY);
task_io_account_write(PAGE_CACHE_SIZE);
}
radix_tree_tag_set(&mapping->page_tree,
@@ -961,6 +962,7 @@ int clear_page_dirty_for_io(struct page
*/
if (TestClearPageDirty(page)) {
dec_zone_page_state(page, NR_FILE_DIRTY);
+ dec_bdi_stat(mapping->backing_dev_info, BDI_DIRTY);
return 1;
}
return 0;
Index: linux-2.6-mm/mm/truncate.c
===================================================================
--- linux-2.6-mm.orig/mm/truncate.c
+++ linux-2.6-mm/mm/truncate.c
@@ -71,6 +71,7 @@ void cancel_dirty_page(struct page *page
struct address_space *mapping = page->mapping;
if (mapping && mapping_cap_account_dirty(mapping)) {
dec_zone_page_state(page, NR_FILE_DIRTY);
+ dec_bdi_stat(mapping->backing_dev_info, BDI_DIRTY);
if (account_size)
task_io_account_cancelled_write(account_size);
}
Index: linux-2.6-mm/include/linux/backing-dev.h
===================================================================
--- linux-2.6-mm.orig/include/linux/backing-dev.h
+++ linux-2.6-mm/include/linux/backing-dev.h
@@ -26,6 +26,7 @@ enum bdi_state {
typedef int (congested_fn)(void *, int);

enum bdi_stat_item {
+ BDI_DIRTY,
NR_BDI_STAT_ITEMS
};

--

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