NR_WRITTEN is now accounted at block IO enqueue time, which is not
very accurate as to common understanding. This moves NR_WRITTEN
accounting to the IO completion time and makes it more consistent
with BDI_WRITTEN, which is used for bandwidth estimation.
CC: Michael Rubin <mrubin@xxxxxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
mm/page-writeback.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- linux-next.orig/mm/page-writeback.c 2011-04-18 17:28:44.000000000 +0800
+++ linux-next/mm/page-writeback.c 2011-04-18 17:30:33.000000000 +0800
@@ -1846,7 +1846,6 @@ EXPORT_SYMBOL(account_page_dirtied);
void account_page_writeback(struct page *page)
{
inc_zone_page_state(page, NR_WRITEBACK);
- inc_zone_page_state(page, NR_WRITTEN);
}
EXPORT_SYMBOL(account_page_writeback);
@@ -2063,8 +2062,10 @@ int test_clear_page_writeback(struct pag
} else {
ret = TestClearPageWriteback(page);
}
- if (ret)
+ if (ret) {
dec_zone_page_state(page, NR_WRITEBACK);
+ inc_zone_page_state(page, NR_WRITTEN);
+ }
return ret;
}
--
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