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159e3acf5d
TASK_SHARED_WQ was set upon task creation and never changed afterwards. Thus if a task was created to run anywhere (e.g. a check or a Lua task), all its timers would always pass through the shared timers queue with a lock. Now we know that tid<0 indicates a shared task, so we can use that to decide whether or not to use the shared queue. The task might be migrated using task_set_affinity() but it's always dequeued first so the check will still be valid. Not only this removes a flag that's difficult to keep synchronized with the thread ID, but it should significantly lower the load on systems with many checks. A quick test with 5000 servers and fast checks that were saturating the CPU shows that the check rate increased by 20% (hence the CPU usage dropped by 17%). It's worth noting that run_task_lists() almost no longer appears in perf top now. |
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| base64 | ||
| coccinelle | ||
| flags | ||
| hpack | ||
| plug_qdisc | ||
| poll | ||
| qpack | ||
| tcploop | ||
| trace | ||
| udp | ||