| From | benbjiang(蒋彪) <> | Subject | Re: [PATCH RFC] sched: Add a per-thread core scheduling interface(Internet mail) | Date | Thu, 21 May 2020 04:09:50 +0000 |
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> On May 21, 2020, at 6:26 AM, Joel Fernandes (Google) <joel@joelfernandes.org> wrote: > > Add a per-thread core scheduling interface which allows a thread to tag > itself and enable core scheduling. Based on discussion at OSPM with > maintainers, we propose a prctl(2) interface accepting values of 0 or 1. > 1 - enable core scheduling for the task. > 0 - disable core scheduling for the task. > > Special cases: > (1) > The core-scheduling patchset contains a CGroup interface as well. In > order for us to respect users of that interface, we avoid overriding the > tag if a task was CGroup-tagged because the task becomes inconsistent > with the CGroup tag. Instead return -EBUSY. > > (2) > If a task is prctl-tagged, allow the CGroup interface to override > the task's tag. > > ChromeOS will use core-scheduling to securely enable hyperthreading. > This cuts down the keypress latency in Google docs from 150ms to 50ms > while improving the camera streaming frame rate by ~3%. Hi, Are the performance improvements compared to the hyperthreading disabled scenario or not? Could you help to explain how the keypress latency improvement comes with core-scheduling?
Thanks a lot.
Regards, Jiang
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