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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-12-19 14:05:13 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-12-19 14:05:13 -0800
commit3a6927906f1b2adf5a31b789322d32eb8559ada0 (patch)
treeef5b9dce5fd1b27be027fcff0a749547e9319ff0
parent3e3b3916a9c5c28a16528585478de19fea59816b (diff)
downloadconfigs-3a6927906f1b2adf5a31b789322d32eb8559ada0.tar.gz
Do dirty page accounting when removing a page from the page cache
Krzysztof Oledzki noticed a dirty page accounting leak on some of his machines, causing the machine to eventually lock up when the kernel decided that there was too much dirty data, but nobody could actually write anything out to fix it. The culprit turns out to be filesystems (cough ext3 with data=journal cough) that re-dirty the page when the "->invalidatepage()" callback is called. Fix it up by doing a final dirty page accounting check when we actually remove the page from the page cache. This fixes bugzilla entry 9182: http://bugzilla.kernel.org/show_bug.cgi?id=9182 Tested-by: Ingo Molnar <mingo@elte.hu> Tested-by: Krzysztof Oledzki <olel@ans.pl> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/filemap.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 188cf5fd3e8..f4d0cded0e1 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -124,6 +124,18 @@ void __remove_from_page_cache(struct page *page)
mapping->nrpages--;
__dec_zone_page_state(page, NR_FILE_PAGES);
BUG_ON(page_mapped(page));
+
+ /*
+ * Some filesystems seem to re-dirty the page even after
+ * the VM has canceled the dirty bit (eg ext3 journaling).
+ *
+ * Fix it up by doing a final dirty accounting check after
+ * having removed the page entirely.
+ */
+ if (PageDirty(page) && mapping_cap_account_dirty(mapping)) {
+ dec_zone_page_state(page, NR_FILE_DIRTY);
+ dec_bdi_stat(mapping->backing_dev_info, BDI_RECLAIMABLE);
+ }
}
void remove_from_page_cache(struct page *page)