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dm: use non reentrant workqueues if equivalent

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kmirrord_wq, kcopyd_work and md->wq are created per dm instance and
serve only a single work item from the dm instance, so non-reentrant
workqueues would provide the same ordering guarantees as ordered ones
while allowing CPU affinity and use of the workqueues for other
purposes.  Switch them to non-reentrant workqueues.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Tejun Heo
2011-01-13 19:59:58 +00:00
committed by Alasdair G Kergon
parent 4d4d66ab53
commit 9c4376de98
4 changed files with 9 additions and 6 deletions
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5
drivers/md/dm-raid1.c
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@@ -1085,7 +1085,8 @@ static int mirror_ctr(struct dm_target *ti, unsigned int argc, char **argv)
ti->num_flush_requests = 1;
ti->num_discard_requests = 1;
ms->kmirrord_wq = alloc_ordered_workqueue("kmirrord", WQ_MEM_RECLAIM);
ms->kmirrord_wq = alloc_workqueue("kmirrord",
WQ_NON_REENTRANT | WQ_MEM_RECLAIM, 0);
if (!ms->kmirrord_wq) {
DMERR("couldn't start kmirrord");
r = -ENOMEM;
@@ -1414,7 +1415,7 @@ static int mirror_iterate_devices(struct dm_target *ti,
static struct target_type mirror_target = {
.name = "mirror",
.version = {1, 12, 0},
.version = {1, 12, 1},
.module = THIS_MODULE,
.ctr = mirror_ctr,
.dtr = mirror_dtr,