Count per BDI writeback pages. Signed-off-by: Peter Zijlstra --- 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 }; -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/