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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-06 21:59:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-06 21:59:31 -0700 |
| commit | 9954d4892a813155cf808b1c29df50886b5672cf (patch) | |
| tree | 7988449c499804aab0550a4e7381b417dbc6980e /Documentation | |
| parent | Merge branch 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu (diff) | |
| parent | workqueue: Fix flag collision (diff) | |
| download | linux-dev-9954d4892a813155cf808b1c29df50886b5672cf.tar.xz linux-dev-9954d4892a813155cf808b1c29df50886b5672cf.zip | |
Merge branch 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
Pull workqueue updates from Tejun Heo:
"Nothing major. I introduced a flag collsion bug during v4.13 cycle
which is fixed in this pull request. Fortunately, the flag is for
debugging / verification and the bug isn't critical"
* 'for-4.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
workqueue: Fix flag collision
workqueue: Use TASK_IDLE
workqueue: fix path to documentation
workqueue: doc change for ST behavior on NUMA systems
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/core-api/workqueue.rst | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/Documentation/core-api/workqueue.rst b/Documentation/core-api/workqueue.rst index ffdec94fbca1..3943b5bfa8cf 100644 --- a/Documentation/core-api/workqueue.rst +++ b/Documentation/core-api/workqueue.rst @@ -243,11 +243,15 @@ throttling the number of active work items, specifying '0' is recommended. Some users depend on the strict execution ordering of ST wq. The -combination of ``@max_active`` of 1 and ``WQ_UNBOUND`` is used to -achieve this behavior. Work items on such wq are always queued to the -unbound worker-pools and only one work item can be active at any given +combination of ``@max_active`` of 1 and ``WQ_UNBOUND`` used to +achieve this behavior. Work items on such wq were always queued to the +unbound worker-pools and only one work item could be active at any given time thus achieving the same ordering property as ST wq. +In the current implementation the above configuration only guarantees +ST behavior within a given NUMA node. Instead alloc_ordered_queue should +be used to achieve system wide ST behavior. + Example Execution Scenarios =========================== |