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authorTejun Heo <tj@kernel.org>2013-03-12 11:30:05 -0700
committerTejun Heo <tj@kernel.org>2013-03-12 11:37:07 -0700
commit226223ab3c4118ddd10688cc2c131135848371ab (patch)
tree050da70ca30d34cbc9e21f628935e020c4106894 /include/linux/workqueue.h
parent36b519dfc7b57b8f91940a6e346d9a248e501e0d (diff)
downloadop-kernel-dev-226223ab3c4118ddd10688cc2c131135848371ab.zip
op-kernel-dev-226223ab3c4118ddd10688cc2c131135848371ab.tar.gz
workqueue: implement sysfs interface for workqueues
There are cases where workqueue users want to expose control knobs to userland. e.g. Unbound workqueues with custom attributes are scheduled to be used for writeback workers and depending on configuration it can be useful to allow admins to tinker with the priority or allowed CPUs. This patch implements workqueue_sysfs_register(), which makes the workqueue visible under /sys/bus/workqueue/devices/WQ_NAME. There currently are two attributes common to both per-cpu and unbound pools and extra attributes for unbound pools including nice level and cpumask. If alloc_workqueue*() is called with WQ_SYSFS, workqueue_sysfs_register() is called automatically as part of workqueue creation. This is the preferred method unless the workqueue user wants to apply workqueue_attrs before making the workqueue visible to userland. v2: Disallow exposing ordered workqueues as ordered workqueues can't be tuned in any way. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include/linux/workqueue.h')
-rw-r--r--include/linux/workqueue.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 5668ab2..7f6d29a 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -293,6 +293,7 @@ enum {
WQ_MEM_RECLAIM = 1 << 3, /* may be used for memory reclaim */
WQ_HIGHPRI = 1 << 4, /* high priority */
WQ_CPU_INTENSIVE = 1 << 5, /* cpu instensive workqueue */
+ WQ_SYSFS = 1 << 6, /* visible in sysfs, see wq_sysfs_register() */
__WQ_DRAINING = 1 << 16, /* internal: workqueue is draining */
__WQ_ORDERED = 1 << 17, /* internal: workqueue is ordered */
@@ -495,4 +496,11 @@ extern bool freeze_workqueues_busy(void);
extern void thaw_workqueues(void);
#endif /* CONFIG_FREEZER */
+#ifdef CONFIG_SYSFS
+int workqueue_sysfs_register(struct workqueue_struct *wq);
+#else /* CONFIG_SYSFS */
+static inline int workqueue_sysfs_register(struct workqueue_struct *wq)
+{ return 0; }
+#endif /* CONFIG_SYSFS */
+
#endif
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