The patch titled
Subject: fs/dax.c: fix inefficiency in dax_writeback_mapping_range()
has been added to the -mm tree. Its filename is
dax-fix-inefficiency-in-dax_writeback_mapping_range.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/dax-fix-inefficiency-in-dax_writeback_mapping_range.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/dax-fix-inefficiency-in-dax_writeback_mapping_range.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Jan Kara <jack@xxxxxxx>
Subject: fs/dax.c: fix inefficiency in dax_writeback_mapping_range()
dax_writeback_mapping_range() fails to update iteration index when
searching radix tree for entries needing cache flushing. Thus each
pagevec worth of entries is searched starting from the start which is
inefficient and prone to livelocks. Update index properly.
Link: http://lkml.kernel.org/r/20170619124531.21491-1-jack@xxxxxxx
Fixes: 9973c98ecfda3 ("dax: add support for fsync/sync")
Signed-off-by: Jan Kara <jack@xxxxxxx>
Reviewed-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/dax.c | 1 +
1 file changed, 1 insertion(+)
diff -puN fs/dax.c~dax-fix-inefficiency-in-dax_writeback_mapping_range fs/dax.c
--- a/fs/dax.c~dax-fix-inefficiency-in-dax_writeback_mapping_range
+++ a/fs/dax.c
@@ -859,6 +859,7 @@ int dax_writeback_mapping_range(struct a
if (ret < 0)
goto out;
}
+ start_index = indices[pvec.nr - 1] + 1;
}
out:
put_dax(dax_dev);
_
Patches currently in -mm which might be from jack@xxxxxxx are
dax-fix-inefficiency-in-dax_writeback_mapping_range.patch
mm-fix-thp-handling-in-invalidate_mapping_pages.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
