The patch titled
writeback: account NR_WRITTEN at IO completion time
has been added to the -mm tree. Its filename is
writeback-account-nr_written-at-io-completion-time.patch
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------------------------------------------------------
Subject: writeback: account NR_WRITTEN at IO completion time
From: Wu Fengguang <fengguang.wu@xxxxxxxxx>
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@xxxxxxxxx>
Cc: Michael Rubin <mrubin@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page-writeback.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff -puN mm/page-writeback.c~writeback-account-nr_written-at-io-completion-time mm/page-writeback.c
--- a/mm/page-writeback.c~writeback-account-nr_written-at-io-completion-time
+++ a/mm/page-writeback.c
@@ -1146,7 +1146,6 @@ 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);
@@ -1363,8 +1362,10 @@ 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;
}
_
Patches currently in -mm which might be from fengguang.wu@xxxxxxxxx are
linux-next.patch
bdi_min_ratio-never-shrinks-ultimately-preventing-valid-setting-of-min_ratio.patch
writeback-account-nr_written-at-io-completion-time.patch
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