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| author | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2011-12-12 16:10:07 +0100 |
|---|---|---|
| committer | Jan Schmidt <list.btrfs@jan-o-sch.net> | 2012-01-04 16:12:48 +0100 |
| commit | a168650c08300434e1456abe7b6451f1448230d3 (patch) | |
| tree | addddb060b018eb569e97c11e1a1451feef11c7a /fs/btrfs/transaction.c | |
| parent | d1270cd91f308c9d22b2804720c36ccd32dbc35e (diff) | |
| download | blackbird-op-linux-a168650c08300434e1456abe7b6451f1448230d3.tar.gz blackbird-op-linux-a168650c08300434e1456abe7b6451f1448230d3.zip | |
Btrfs: add waitqueue instead of doing busy waiting for more delayed refs
Now that we may be holding back delayed refs for a limited period, we
might end up having no runnable delayed refs. Without this commit, we'd
do busy waiting in that thread until another (runnable) ref arives.
Instead, we're detecting this situation and use a waitqueue, such that
we only try to run more refs after
a) another runnable ref was added or
b) delayed refs are no longer held back
Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Diffstat (limited to 'fs/btrfs/transaction.c')
| -rw-r--r-- | fs/btrfs/transaction.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 31a7393af64e..04c5c7c2c32f 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -111,6 +111,7 @@ loop: cur_trans->delayed_refs.flushing = 0; cur_trans->delayed_refs.run_delayed_start = 0; cur_trans->delayed_refs.seq = 1; + init_waitqueue_head(&cur_trans->delayed_refs.seq_wait); spin_lock_init(&cur_trans->commit_lock); spin_lock_init(&cur_trans->delayed_refs.lock); INIT_LIST_HEAD(&cur_trans->delayed_refs.seq_head); |
