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drbd: factor out drbd_rs_number_requests 

Preparation patch to be able to use the auto-throttling resync controller
for online-verify requests as well.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
hifive-unleashed-5.1
Lars Ellenberg 2010-11-05 10:04:07 +01:00 committed by Philipp Reisner
parent 9bd28d3c90
commit e65f440d47
1 changed files with 29 additions and 32 deletions
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61
drivers/block/drbd/drbd_worker.c
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@ -492,6 +492,32 @@ int drbd_rs_controller(struct drbd_conf *mdev)
return req_sect;
}
int drbd_rs_number_requests(struct drbd_conf *mdev)
{
int number;
if (mdev->rs_plan_s.size) { /* mdev->sync_conf.c_plan_ahead */
number = drbd_rs_controller(mdev) >> (BM_BLOCK_SHIFT - 9);
mdev->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME;
} else {
mdev->c_sync_rate = mdev->sync_conf.rate;
number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ);
}
/* Throttle resync on lower level disk activity, which may also be
* caused by application IO on Primary/SyncTarget.
* Keep this after the call to drbd_rs_controller, as that assumes
* to be called as precisely as possible every SLEEP_TIME,
* and would be confused otherwise. */
if (number && drbd_rs_should_slow_down(mdev)) {
mdev->c_sync_rate = 1;
number = 0;
}
/* ignore the amount of pending requests, the resync controller should
* throttle down to incoming reply rate soon enough anyways. */
return number;
}
int w_make_resync_request(struct drbd_conf *mdev,
struct drbd_work *w, int cancel)
{
@ -499,7 +525,7 @@ int w_make_resync_request(struct drbd_conf *mdev,
sector_t sector;
const sector_t capacity = drbd_get_capacity(mdev->this_bdev);
int max_segment_size;
int number, rollback_i, size, pe, mx;
int number, rollback_i, size;
int align, queued, sndbuf;
int i = 0;
@ -537,39 +563,10 @@ int w_make_resync_request(struct drbd_conf *mdev,
mdev->agreed_pro_version < 94 ? queue_max_segment_size(mdev->rq_queue) :
mdev->agreed_pro_version < 95 ? DRBD_MAX_SIZE_H80_PACKET : DRBD_MAX_SEGMENT_SIZE;
if (mdev->rs_plan_s.size) { /* mdev->sync_conf.c_plan_ahead */
number = drbd_rs_controller(mdev) >> (BM_BLOCK_SHIFT - 9);
mdev->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME;
} else {
mdev->c_sync_rate = mdev->sync_conf.rate;
number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ);
}
/* Throttle resync on lower level disk activity, which may also be
* caused by application IO on Primary/SyncTarget.
* Keep this after the call to drbd_rs_controller, as that assumes
* to be called as precisely as possible every SLEEP_TIME,
* and would be confused otherwise. */
if (drbd_rs_should_slow_down(mdev))
number = drbd_rs_number_requests(mdev);
if (number == 0)
goto requeue;
mutex_lock(&mdev->data.mutex);
if (mdev->data.socket)
mx = mdev->data.socket->sk->sk_rcvbuf / sizeof(struct p_block_req);
else
mx = 1;
mutex_unlock(&mdev->data.mutex);
/* For resync rates >160MB/sec, allow more pending RS requests */
if (number > mx)
mx = number;
/* Limit the number of pending RS requests to no more than the peer's receive buffer */
pe = atomic_read(&mdev->rs_pending_cnt);
if ((pe + number) > mx) {
number = mx - pe;
}
for (i = 0; i < number; i++) {
/* Stop generating RS requests, when half of the send buffer is filled */
mutex_lock(&mdev->data.mutex);