diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-06-27 16:32:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-06-27 16:32:52 -0700 |
| commit | 7ab044a4f42aecba23db5ce96e763e5ec807bf42 (patch) | |
| tree | 057896b2b9749e0a380e088bf4a749fb3a59b2e4 /Documentation/admin-guide | |
| parent | 18eb3b6dff007f2e4ef4f0d8567dfb5cdb6086fc (diff) | |
| parent | 18c8ae813156a6855f026de80fffb91e1a28ab3d (diff) | |
| download | lwn-7ab044a4f42aecba23db5ce96e763e5ec807bf42.tar.gz lwn-7ab044a4f42aecba23db5ce96e763e5ec807bf42.zip | |
Merge tag 'wq-for-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
Pull workqueue updates from Tejun Heo:
- Concurrency-managed per-cpu work items that hog CPUs and delay the
execution of other work items are now automatically detected and
excluded from concurrency management. Reporting on such work items
can also be enabled through a config option.
- Added tools/workqueue/wq_monitor.py which improves visibility into
workqueue usages and behaviors.
- Arnd's minimal fix for gcc-13 enum warning on 32bit compiles,
superseded by commit afa4bb778e48 in mainline.
* tag 'wq-for-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
workqueue: Disable per-cpu CPU hog detection when wq_cpu_intensive_thresh_us is 0
workqueue: Fix WARN_ON_ONCE() triggers in worker_enter_idle()
workqueue: fix enum type for gcc-13
workqueue: Track and monitor per-workqueue CPU time usage
workqueue: Report work funcs that trigger automatic CPU_INTENSIVE mechanism
workqueue: Automatically mark CPU-hogging work items CPU_INTENSIVE
workqueue: Improve locking rule description for worker fields
workqueue: Move worker_set/clr_flags() upwards
workqueue: Re-order struct worker fields
workqueue: Add pwq->stats[] and a monitoring script
Further upgrade queue_work_on() comment
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 87bd0e3271b0..487d5da5355d 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -6972,6 +6972,18 @@ it can be updated at runtime by writing to the corresponding sysfs file. + workqueue.cpu_intensive_thresh_us= + Per-cpu work items which run for longer than this + threshold are automatically considered CPU intensive + and excluded from concurrency management to prevent + them from noticeably delaying other per-cpu work + items. Default is 10000 (10ms). + + If CONFIG_WQ_CPU_INTENSIVE_REPORT is set, the kernel + will report the work functions which violate this + threshold repeatedly. They are likely good + candidates for using WQ_UNBOUND workqueues instead. + workqueue.disable_numa By default, all work items queued to unbound workqueues are affine to the NUMA nodes they're |