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dm: use non reentrant workqueues if equivalent 

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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3
drivers/md/dm-kcopyd.c
View File

@ -672,7 +672,8 @@ int dm_kcopyd_client_create(unsigned int nr_pages,
goto bad_slab;
INIT_WORK(&kc->kcopyd_work, do_work);
kc->kcopyd_wq = alloc_ordered_workqueue("kcopyd", WQ_MEM_RECLAIM);
kc->kcopyd_wq = alloc_workqueue("kcopyd",
WQ_NON_REENTRANT | WQ_MEM_RECLAIM, 0);
if (!kc->kcopyd_wq)
goto bad_workqueue;

5
drivers/md/dm-raid1.c
View File

@ -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,

3
drivers/md/dm.c
View File

@ -1883,7 +1883,8 @@ static struct mapped_device *alloc_dev(int minor)
add_disk(md->disk);
format_dev_t(md->name, MKDEV(_major, minor));
md->wq = alloc_ordered_workqueue("kdmflush", WQ_MEM_RECLAIM);
md->wq = alloc_workqueue("kdmflush",
WQ_NON_REENTRANT | WQ_MEM_RECLAIM, 0);
if (!md->wq)
goto bad_thread;

4
include/linux/dm-ioctl.h
View File

@ -268,8 +268,8 @@ enum {
#define DM_VERSION_MAJOR 4
#define DM_VERSION_MINOR 19
#define DM_VERSION_PATCHLEVEL 0
#define DM_VERSION_EXTRA "-ioctl (2010-10-14)"
#define DM_VERSION_PATCHLEVEL 1
#define DM_VERSION_EXTRA "-ioctl (2011-01-07)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */