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writeback: account NR_WRITTEN at IO completion time 

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.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wu Fengguang 2011-07-25 17:12:37 -07:00 committed by Linus Torvalds
parent 48f170fb7d
commit 99b12e3d88
1 changed files with 3 additions and 2 deletions
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5
mm/page-writeback.c
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@ -1141,7 +1141,6 @@ 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);
@ -1358,8 +1357,10 @@ int test_clear_page_writeback(struct page *page)
} else {
ret = TestClearPageWriteback(page);
}
if (ret)
if (ret) {
dec_zone_page_state(page, NR_WRITEBACK);
inc_zone_page_state(page, NR_WRITTEN);
}
return ret;
}