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block: change the request allocation/congestion logic to be sync/async based

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This makes sure that we never wait on async IO for sync requests, instead
of doing the split on writes vs reads.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jens Axboe 2009-04-06 14:48:01 +02:00 • committed by Linus Torvalds
parent 0221c81b1b
commit 1faa16d228
6 changed files with 100 additions and 82 deletions
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10
mm/backing-dev.c
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@ -284,12 +284,12 @@ static wait_queue_head_t congestion_wqh[2] = {
};
void clear_bdi_congested(struct backing_dev_info *bdi, int rw)
void clear_bdi_congested(struct backing_dev_info *bdi, int sync)
{
enum bdi_state bit;
wait_queue_head_t *wqh = &congestion_wqh[rw];
wait_queue_head_t *wqh = &congestion_wqh[sync];
bit = (rw == WRITE) ? BDI_write_congested : BDI_read_congested;
bit = sync ? BDI_sync_congested : BDI_async_congested;
clear_bit(bit, &bdi->state);
smp_mb__after_clear_bit();
if (waitqueue_active(wqh))
@ -297,11 +297,11 @@ void clear_bdi_congested(struct backing_dev_info *bdi, int rw)
}
EXPORT_SYMBOL(clear_bdi_congested);
void set_bdi_congested(struct backing_dev_info *bdi, int rw)
void set_bdi_congested(struct backing_dev_info *bdi, int sync)
{
enum bdi_state bit;
bit = (rw == WRITE) ? BDI_write_congested : BDI_read_congested;
bit = sync ? BDI_sync_congested : BDI_async_congested;
set_bit(bit, &bdi->state);
}
EXPORT_SYMBOL(set_bdi_congested);