Messages in this thread Patch in this message | | | From | Aaron Carroll <> | Date | Wed, 05 Dec 2007 21:07:07 +1100 | Subject | [PATCH] as-iosched: fix write batch start point |
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New write batches currently start from where the last one completed. We have no idea where the head is after switching batches, so this makes little sense. Instead, start the next batch from the request with the earliest deadline in the hope that we avoid a deadline expiry later on.
Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au> --- block/as-iosched.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/block/as-iosched.c b/block/as-iosched.c index 4513fc5..555cd6b 100644 --- a/block/as-iosched.c +++ b/block/as-iosched.c @@ -1097,7 +1097,8 @@ dispatch_writes: ad->batch_data_dir = REQ_ASYNC; ad->current_write_count = ad->write_batch_count; ad->write_batch_idled = 0; - rq = ad->next_rq[ad->batch_data_dir]; + rq = rq_entry_fifo(ad->fifo_list[REQ_ASYNC].next); + ad->last_check_fifo[REQ_ASYNC] = jiffies; goto dispatch_request; } --
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