Convert dispatch_workq from legacy priorities to qos #253
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src/event/workqueue.c
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| } dispatch_workq_monitor_s, *dispatch_workq_monitor_t; | ||
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| static dispatch_workq_monitor_s _dispatch_workq_monitors[WORKQ_NUM_PRIORITIES]; | ||
| static dispatch_workq_monitor_s _dispatch_workq_monitors[DISPATCH_QOS_MAX+1]; |
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do you actually need the 0 slot (DISPATCH_QOS_UNSPECIFIED) or is this just to make it easier by avoiding the index conversion?
elsewhere we have DISPATCH_QOS_MAX for similar array sizes (e.g. _dispatch_narrowing_deadlines), so this would be worth a comment if so
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just to avoid index conversion, but I will change to match convention used elsewhere.
src/event/workqueue.c
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| // temporary until we switch over to QoS based interface. | ||
| static dispatch_queue_t | ||
| get_root_queue_from_legacy_priority(int priority) | ||
| get_root_queue_from_dispatch_qos(dispatch_qos_t qos) |
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this seems effectively the same as _dispatch_get_root_queue now ? (inline_internal.h)
can we not use that here ?
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thanks! I thought there must be a routine that did this somewhere, but I missed finding it.
src/queue.c
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| #if DISPATCH_USE_WORKQUEUES | ||
| qos_class_t dgq_qos; | ||
| int dgq_wq_priority, dgq_wq_options; | ||
| #if HAVE_PTHREAD_WORKQUEUES |
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I think this could be conditionalized more tightly with HAVE_PTHREAD_WORKQUEUE_SETDISPATCH_NP || DISPATCH_USE_LEGACY_WORKQUEUE_FALLBACK now (or add a define at the top for this combination to make it cleaner), those are the only remaining cases that need this field)
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will give it a try
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Update dispatch_workq (DISPATCH_USE_INTERNAL_WORKQUEUE) to use QoS-based constants instead of legacy priorities. Enhance monitoring code to count runnable threads from highest QoS to lowest and to suppress voluntary oversubscription for lower QoS queues if the total count of runnable worker threads is already over the desired threshold.
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updated to address review comments. I'm not in a rush to get this merged, so fine with me if you need to put on the back burner until libdispatch-890 merge goes through. |
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lgtm, thanks! yes, lets please wait until libdispatch-890 can be merged (which will also create a small conflict here) |
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@swift-ci please test |
Convert dispatch_workq from legacy priorities to qos Signed-off-by: Daniel A. Steffen <dsteffen@apple.com>
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Update dispatch_workq (DISPATCH_USE_INTERNAL_WORKQUEUE)
to use QoS-based constants instead of legacy priorities.
Enhance monitoring code to count runnable threads from
highest QoS to lowest and to suppress voluntary
oversubscription for lower QoS queues if the total count
of runnable worker threads is already over the desired
threshold.