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md: drop queue limitation for RAID1 and RAID10

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As suggested by Neil Brown[1], this limitation seems to be
deprecated.

With plugging in use, writes are processed behind the raid thread
and conf->pending_count is not increased. This limitation occurs only
if caller doesn't use plugs.

It can be avoided and often it is (with plugging). There are no reports
that queue is growing to enormous size so remove queue limitation for
non-plugged IOs too.

[1] https://lore.kernel.org/linux-raid/162496301481.7211.18031090130574610495@noble.neil.brown.name

Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>
Signed-off-by: Song Liu <song@kernel.org>
This commit is contained in:
Mariusz Tkaczyk 2021-12-17 10:29:55 +01:00 committed by Song Liu
parent 770b1d216d
commit a92ce0feff
3 changed files with 0 additions and 20 deletions
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6
drivers/md/raid1-10.c
View File

@ -22,12 +22,6 @@
#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
/* When there are this many requests queue to be written by
* the raid thread, we become 'congested' to provide back-pressure
* for writeback.
*/
static int max_queued_requests = 1024;
/* for managing resync I/O pages */
struct resync_pages {
void *raid_bio;

7
drivers/md/raid1.c
View File

@ -1358,12 +1358,6 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio,
r1_bio = alloc_r1bio(mddev, bio);
r1_bio->sectors = max_write_sectors;
if (conf->pending_count >= max_queued_requests) {
md_wakeup_thread(mddev->thread);
raid1_log(mddev, "wait queued");
wait_event(conf->wait_barrier,
conf->pending_count < max_queued_requests);
}
/* first select target devices under rcu_lock and
* inc refcount on their rdev. Record them by setting
* bios[x] to bio
@ -3410,4 +3404,3 @@ MODULE_ALIAS("md-personality-3"); /* RAID1 */
MODULE_ALIAS("md-raid1");
MODULE_ALIAS("md-level-1");
module_param(max_queued_requests, int, S_IRUGO|S_IWUSR);

7
drivers/md/raid10.c
View File

@ -1387,12 +1387,6 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio,
conf->reshape_safe = mddev->reshape_position;
}
if (conf->pending_count >= max_queued_requests) {
md_wakeup_thread(mddev->thread);
raid10_log(mddev, "wait queued");
wait_event(conf->wait_barrier,
conf->pending_count < max_queued_requests);
}
/* first select target devices under rcu_lock and
* inc refcount on their rdev. Record them by setting
* bios[x] to bio
@ -5243,4 +5237,3 @@ MODULE_ALIAS("md-personality-9"); /* RAID10 */
MODULE_ALIAS("md-raid10");
MODULE_ALIAS("md-level-10");
module_param(max_queued_requests, int, S_IRUGO|S_IWUSR);