diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2007-10-16 23:25:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:45 -0700 |
| commit | 69cb51d18c1ed593009d9a620cac49d0dcf15dc8 (patch) | |
| tree | f26a1245b638e7421a0afd93305fd1c556867d49 | |
| parent | c9e51e4180696aa67915ec5665e4ec74125565de (diff) | |
mm: count writeback pages per BDI
Count per BDI writeback pages.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/backing-dev.h | 1 | ||||
| -rw-r--r-- | mm/page-writeback.c | 12 |
2 files changed, 11 insertions, 2 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index bfae09d2a1e..4d9222c2f22 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -28,6 +28,7 @@ typedef int (congested_fn)(void *, int); enum bdi_stat_item { BDI_RECLAIMABLE, + BDI_WRITEBACK, NR_BDI_STAT_ITEMS }; diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 9b3c4ee62ab..f1d201fdcf9 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -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), |