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| author |   Wu Fengguang <fengguang.wu@intel.com> | 2010-10-26 14:21:26 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-26 16:52:05 -0700 |
| commit | 1b430beee5e388605dfb092b214ef0320f752cf6 (patch) | |
| tree | c1b1ece282aab771fd1386a3fe0c6e82cb5c5bfe /mm/migrate.c | |
| parent | oom: fix locking for oom_adj and oom_score_adj (diff) | |
| download | linux-dev-1b430beee5e388605dfb092b214ef0320f752cf6.tar.xz linux-dev-1b430beee5e388605dfb092b214ef0320f752cf6.zip | |
writeback: remove nonblocking/encountered_congestion references
This removes more dead code that was somehow missed by commit 0d99519efef
(writeback: remove unused nonblocking and congestion checks). There are
no behavior change except for the removal of two entries from one of the
ext4 tracing interface.
The nonblocking checks in ->writepages are no longer used because the
flusher now prefer to block on get_request_wait() than to skip inodes on
IO congestion. The latter will lead to more seeky IO.
The nonblocking checks in ->writepage are no longer used because it's
redundant with the WB_SYNC_NONE check.
We no long set ->nonblocking in VM page out and page migration, because
a) it's effectively redundant with WB_SYNC_NONE in current code
b) it's old semantic of "Don't get stuck on request queues" is mis-behavior:
that would skip some dirty inodes on congestion and page out others, which
is unfair in terms of LRU age.
Inspired by Christoph Hellwig. Thanks!
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: David Howells <dhowells@redhat.com>
Cc: Sage Weil <sage@newdream.net>
Cc: Steve French <sfrench@samba.org>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index f8c9bccf2520..d917ac3207f5 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -497,7 +497,6 @@ static int writeout(struct address_space *mapping, struct page *page) .nr_to_write = 1, .range_start = 0, .range_end = LLONG_MAX, - .nonblocking = 1, .for_reclaim = 1 }; int rc; |