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Commit 69cb51d1 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Linus Torvalds
Browse files

mm: count writeback pages per BDI 



Count per BDI writeback pages.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c9e51e41

include/linux/backing-dev.h

+1 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ typedef int (congested_fn)(void *, int); 


enum bdi_stat_item {

	BDI_RECLAIMABLE,

	BDI_WRITEBACK,

	NR_BDI_STAT_ITEMS

};

mm/page-writeback.c

+10 −2
Original line number Diff line number Diff line
@@ -979,14 +979,18 @@ int test_clear_page_writeback(struct page *page) 
	int ret;



	if (mapping) {

		struct backing_dev_info *bdi = mapping->backing_dev_info;

		unsigned long flags;



		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);

			if (bdi_cap_writeback_dirty(bdi))

				__dec_bdi_stat(bdi, BDI_WRITEBACK);

		}

		write_unlock_irqrestore(&mapping->tree_lock, flags);

	} else {

		ret = TestClearPageWriteback(page);
@@ -1002,14 +1006,18 @@ int test_set_page_writeback(struct page *page) 
	int ret;



	if (mapping) {

		struct backing_dev_info *bdi = mapping->backing_dev_info;

		unsigned long flags;



		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);

			if (bdi_cap_writeback_dirty(bdi))

				__inc_bdi_stat(bdi, BDI_WRITEBACK);

		}

		if (!PageDirty(page))

			radix_tree_tag_clear(&mapping->page_tree,

						page_index(page),