hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

drbd: fix regression: protocol A sometimes synchronous, C sometimes double-latency 

Regression introduced with 8.4.5
 drbd: application writes may set-in-sync in protocol != C

Overwriting the same block (LBA) while a former version is still
"in-flight" to the peer (to be exact: we did not receive the
P_BARRIER_ACK for its epoch yet) would wait for the full epoch of that
former version to be acknowledged by the peer.

In synchronous and quasi-synchronous protocols C and B,
this may double the latency on overwrites.

With protocol A, which is supposed to be asynchronous and only wait for
local completion, it is even worse: it would make overwrites
quasi-synchronous, they would be hit by the full RTT, which protocol A
was specifically meant to avoid, and possibly the additional time it
takes to drain the buffers first.

Particularly bad for databases, or anything else that
does frequent updates to the same blocks (various file system meta data).

No impact if >= rtt passes between updates to the same block.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Lars Ellenberg 2016-06-14 00:26:17 +02:00 committed by Jens Axboe
parent bca1cbaeac
commit 1b228c98ce
1 changed files with 11 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/block/drbd/drbd_req.c
View File

@ -977,16 +977,20 @@ static void complete_conflicting_writes(struct drbd_request *req)
sector_t sector = req->i.sector;
int size = req->i.size;
i = drbd_find_overlap(&device->write_requests, sector, size);
if (!i)
return;
for (;;) {
prepare_to_wait(&device->misc_wait, &wait, TASK_UNINTERRUPTIBLE);
i = drbd_find_overlap(&device->write_requests, sector, size);
if (!i)
drbd_for_each_overlap(i, &device->write_requests, sector, size) {
/* Ignore, if already completed to upper layers. */
if (i->completed)
continue;
/* Handle the first found overlap. After the schedule
* we have to restart the tree walk. */
break;
}
if (!i) /* if any */
break;
/* Indicate to wake up device->misc_wait on progress. */
prepare_to_wait(&device->misc_wait, &wait, TASK_UNINTERRUPTIBLE);
i->waiting = true;
spin_unlock_irq(&device->resource->req_lock);
schedule();