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| author |   Bhaktipriya Shridhar <bhaktipriya96@gmail.com> | 2016-07-16 14:18:34 +0530 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-07-18 10:17:21 +0200 |
| commit | 7b1058bc59ac24eb01e259749e8655fb884aa711 (patch) | |
| tree | 3606d57eb01a0c82004d3faf86a4c6e898fe7d46 /drivers/s390/cio/chp.c | |
| parent | s390/chsc: improve channel path descriptor determination (diff) | |
| download | linux-dev-7b1058bc59ac24eb01e259749e8655fb884aa711.tar.xz linux-dev-7b1058bc59ac24eb01e259749e8655fb884aa711.zip | |
s390/cio/chp : Remove deprecated create_singlethread_workqueue
The workqueue "chp_wq" is involved in performing pending
configure tasks for channel paths.
It has a single work item(&cfg_work) and hence doesn't require
ordering. Also, it is not being used on a memory reclaim path.
Hence, the singlethreaded workqueue has been replaced with the use of
system_wq.
System workqueues have been able to handle high level of concurrency
for a long time now and hence it's not required to have a singlethreaded
workqueue just to gain concurrency. Unlike a dedicated per-cpu workqueue
created with create_singlethread_workqueue(), system_wq allows multiple
work items to overlap executions even on the same CPU; however, a
per-cpu workqueue doesn't have any CPU locality or global ordering
guarantee unless the target CPU is explicitly specified and thus the
increase of local concurrency shouldn't make any difference.
Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/chp.c')
| -rw-r--r-- | drivers/s390/cio/chp.c | 11 |
1 files changed, 2 insertions, 9 deletions
diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c index d3b72eab2b8f..e96aced58627 100644 --- a/drivers/s390/cio/chp.c +++ b/drivers/s390/cio/chp.c @@ -47,8 +47,6 @@ static DEFINE_MUTEX(info_lock); /* Time after which channel-path status may be outdated. */ static unsigned long chp_info_expires; -/* Workqueue to perform pending configure tasks. */ -static struct workqueue_struct *chp_wq; static struct work_struct cfg_work; /* Wait queue for configure completion events. */ @@ -717,7 +715,7 @@ static void cfg_func(struct work_struct *work) wake_up_interruptible(&cfg_wait_queue); return; } - queue_work(chp_wq, &cfg_work); + schedule_work(&cfg_work); } /** @@ -735,7 +733,7 @@ void chp_cfg_schedule(struct chp_id chpid, int configure) cfg_set_task(chpid, configure ? cfg_configure : cfg_deconfigure); cfg_busy = 1; mutex_unlock(&cfg_lock); - queue_work(chp_wq, &cfg_work); + schedule_work(&cfg_work); } /** @@ -769,11 +767,6 @@ static int __init chp_init(void) ret = crw_register_handler(CRW_RSC_CPATH, chp_process_crw); if (ret) return ret; - chp_wq = create_singlethread_workqueue("cio_chp"); - if (!chp_wq) { - crw_unregister_handler(CRW_RSC_CPATH); - return -ENOMEM; - } INIT_WORK(&cfg_work, cfg_func); init_waitqueue_head(&cfg_wait_queue); if (info_update()) |