diff options
| author | Aaron Carroll <aaronc@gelato.unsw.edu.au> | 2007-10-30 10:40:13 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@carl.home.kernel.dk> | 2007-11-02 08:47:25 +0100 |
| commit | dfb3d72a9aa519672c9ae06f0d2f93eccb35482f (patch) | |
| tree | d6ec7e9b0e0ddbfa1acf59819caca071b1e1f29c /block | |
| parent | 5d1a536621403b442eef60ddd35e6b7a46fb04b7 (diff) | |
| download | lwn-dfb3d72a9aa519672c9ae06f0d2f93eccb35482f.tar.gz lwn-dfb3d72a9aa519672c9ae06f0d2f93eccb35482f.zip | |
Deadline iosched: Reset batch for ordered requests
The deadline I/O scheduler does not reset the batch count when starting
a new batch at a higher-sectored request. This means the second and
subsequent batch in the same data direction will never exceed a single
request in size whenever higher-sectored requests are pending.
This patch gives new batches in the same data direction as old ones
their full quota of requests by resetting the batch count.
Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/deadline-iosched.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/block/deadline-iosched.c b/block/deadline-iosched.c index a44437e5a94b..cb94c838087a 100644 --- a/block/deadline-iosched.c +++ b/block/deadline-iosched.c @@ -306,12 +306,11 @@ dispatch_writes: dispatch_find_request: /* * we are not running a batch, find best request for selected data_dir + * and start a new batch */ if (deadline_check_fifo(dd, data_dir)) { /* An expired request exists - satisfy it */ - dd->batching = 0; rq = rq_entry_fifo(dd->fifo_list[data_dir].next); - } else if (dd->next_rq[data_dir]) { /* * The last req was the same dir and we have a next request in @@ -325,12 +324,13 @@ dispatch_find_request: * higher-sectored requests. Go back to the lowest sectored * request (1 way elevator) and start a new batch. */ - dd->batching = 0; node = rb_first(&dd->sort_list[data_dir]); if (node) rq = rb_entry_rq(node); } + dd->batching = 0; + dispatch_request: /* * rq is the selected appropriate request. |