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workqueue: drop 'H' from kworker names of unbound worker pools 

Currently, all workqueue workers which have negative nice value has
'H' postfixed to their names.  This is necessary for per-cpu workers
as they use the CPU number instead of pool->id to identify the pool
and the 'H' postfix is the only thing distinguishing normal and
highpri workers.

As workers for unbound pools use pool->id, the 'H' postfix is purely
informational.  TASK_COMM_LEN is 16 and after the static part and
delimiters, there are only five characters left for the pool and
worker IDs.  We're expecting to have more unbound pools with the
scheduled NUMA awareness support.  Let's drop the non-essential 'H'
postfix from unbound kworker name.

While at it, restructure kthread_create*() invocation to help future
NUMA related changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
This commit is contained in:
Tejun Heo 2013-04-01 11:23:32 -07:00
parent bce903809a
commit e3c916a4c7
1 changed files with 8 additions and 7 deletions
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15
kernel/workqueue.c
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@ -1644,9 +1644,10 @@ static struct worker *alloc_worker(void)
*/
static struct worker *create_worker(struct worker_pool *pool)
{
const char *pri = pool->attrs->nice < 0 ? "H" : "";
struct worker *worker = NULL;
int node = pool->cpu >= 0 ? cpu_to_node(pool->cpu) : NUMA_NO_NODE;
int id = -1;
char id_buf[16];
lockdep_assert_held(&pool->manager_mutex);
@ -1672,13 +1673,13 @@ static struct worker *create_worker(struct worker_pool *pool)
worker->id = id;
if (pool->cpu >= 0)
worker->task = kthread_create_on_node(worker_thread,
worker, cpu_to_node(pool->cpu),
"kworker/%d:%d%s", pool->cpu, id, pri);
snprintf(id_buf, sizeof(id_buf), "%d:%d%s", pool->cpu, id,
pool->attrs->nice < 0 ? "H" : "");
else
worker->task = kthread_create(worker_thread, worker,
"kworker/u%d:%d%s",
pool->id, id, pri);
snprintf(id_buf, sizeof(id_buf), "u%d:%d", pool->id, id);
worker->task = kthread_create_on_node(worker_thread, worker, node,
"kworker/%s", id_buf);
if (IS_ERR(worker->task))
goto fail;