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Merge tag 'wq-for-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

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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   superseded by commit afa4bb778e in mainline.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
This commit is contained in:
Linus Torvalds
2023-06-27 16:32:52 -07:00
parent 18eb3b6dff 18c8ae8131
commit 7ab044a4f4
7 changed files with 542 additions and 118 deletions
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13
lib/Kconfig.debug
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@@ -1134,6 +1134,19 @@ config WQ_WATCHDOG
state. This can be configured through kernel parameter
"workqueue.watchdog_thresh" and its sysfs counterpart.
config WQ_CPU_INTENSIVE_REPORT
bool "Report per-cpu work items which hog CPU for too long"
depends on DEBUG_KERNEL
help
Say Y here to enable reporting of concurrency-managed per-cpu work
items that hog CPUs for longer than
workqueue.cpu_intensive_threshold_us. Workqueue automatically
detects and excludes them from concurrency management to prevent
them from stalling other per-cpu work items. Occassional
triggering may not necessarily indicate a problem. Repeated
triggering likely indicates that the work item should be switched
to use an unbound workqueue.
config TEST_LOCKUP
tristate "Test module to generate lockups"
depends on m