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Diffstat (limited to 'Documentation/core-api/workqueue.rst')
| -rw-r--r-- | Documentation/core-api/workqueue.rst | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/core-api/workqueue.rst b/Documentation/core-api/workqueue.rst index 16f861c9791e..e295835fc116 100644 --- a/Documentation/core-api/workqueue.rst +++ b/Documentation/core-api/workqueue.rst @@ -245,8 +245,8 @@ CPU which can be assigned to the work items of a wq. For example, with at the same time per CPU. This is always a per-CPU attribute, even for unbound workqueues. -The maximum limit for ``@max_active`` is 512 and the default value used -when 0 is specified is 256. These values are chosen sufficiently high +The maximum limit for ``@max_active`` is 2048 and the default value used +when 0 is specified is 1024. These values are chosen sufficiently high such that they are not the limiting factor while providing protection in runaway cases. @@ -357,6 +357,11 @@ Guidelines difference in execution characteristics between using a dedicated wq and a system wq. + Note: If something may generate more than @max_active outstanding + work items (do stress test your producers), it may saturate a system + wq and potentially lead to deadlock. It should utilize its own + dedicated workqueue rather than the system wq. + * Unless work items are expected to consume a huge amount of CPU cycles, using a bound wq is usually beneficial due to the increased level of locality in wq operations and work item execution. |