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workqueue: update sysfs interface to reflect NUMA awareness and a kernel param to disable NUMA affinity

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Unbound workqueues are now NUMA aware.  Let's add some control knobs
and update sysfs interface accordingly.

* Add kernel param workqueue.numa_disable which disables NUMA affinity
  globally.

* Replace sysfs file "pool_id" with "pool_ids" which contain
  node:pool_id pairs.  This change is userland-visible but "pool_id"
  hasn't seen a release yet, so this is okay.

* Add a new sysf files "numa" which can toggle NUMA affinity on
  individual workqueues.  This is implemented as attrs->no_numa whichn
  is special in that it isn't part of a pool's attributes.  It only
  affects how apply_workqueue_attrs() picks which pools to use.

After "pool_ids" change, first_pwq() doesn't have any user left.
Removed.

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 11:23:38 -07:00
parent 4c16bd327c
commit d55262c4d1
3 changed files with 73 additions and 23 deletions
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5
include/linux/workqueue.h
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@ -119,10 +119,15 @@ struct delayed_work {
/*
* A struct for workqueue attributes. This can be used to change
* attributes of an unbound workqueue.
*
* Unlike other fields, ->no_numa isn't a property of a worker_pool. It
* only modifies how apply_workqueue_attrs() select pools and thus doesn't
* participate in pool hash calculations or equality comparisons.
*/
struct workqueue_attrs {
int nice; /* nice level */
cpumask_var_t cpumask; /* allowed CPUs */
bool no_numa; /* disable NUMA affinity */
};
static inline struct delayed_work *to_delayed_work(struct work_struct *work)