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Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency consideration

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency consideration
Date 2017-02-22 14:20 +0100
Message-ID <tdEZP-2cZ-9@gated-at.bofh.it> (permalink)
References <tdEGu-1Nw-15@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Wed, Feb 22, 2017 at 01:56:37PM +0100, Mike Galbraith wrote:
> Hi,
> 
> Do we really need a spinlock for that in the idle loop?

Urgh, that's broken on RT, you cannot schedule the idle loop.

Also, yeah, reading a s32 should not need no locking, but there's a
bunch of pointer chases in between :/

Nasty code that..

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Thread

9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Mike Galbraith <efault@gmx.de> - 2017-02-22 14:00 +0100
  Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Peter Zijlstra <peterz@infradead.org> - 2017-02-22 14:20 +0100
    Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Mike Galbraith <efault@gmx.de> - 2017-02-22 14:20 +0100
      Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Peter Zijlstra <peterz@infradead.org> - 2017-02-22 15:40 +0100
        Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Alex Shi <alex.shi@linaro.org> - 2017-02-22 16:00 +0100
          Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency consideration "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-02-23 13:30 +0100
            Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Mike Galbraith <efault@gmx.de> - 2017-02-23 14:20 +0100
              Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Alex Shi <alex.shi@linaro.org> - 2017-02-23 15:10 +0100
            Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Alex Shi <alex.shi@linaro.org> - 2017-02-23 15:10 +0100
              Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency consideration "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-02-23 23:40 +0100
                Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Alex Shi <alex.shi@linaro.org> - 2017-02-24 03:00 +0100
                [PATCH] cpuidle: menu: Avoid taking spinlock for accessing QoS values "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-02-24 13:40 +0100
      Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Alex Shi <alex.shi@linaro.org> - 2017-02-22 15:40 +0100
        Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Mike Galbraith <efault@gmx.de> - 2017-02-22 15:50 +0100
    Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Alex Shi <alex.shi@linaro.org> - 2017-02-22 16:00 +0100
      Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Mike Galbraith <efault@gmx.de> - 2017-02-22 16:10 +0100
        Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Alex Shi <alex.shi@linaro.org> - 2017-02-22 16:40 +0100
          Re: 9908859acaa9 cpuidle/menu: add per CPU PM QoS resume latency  consideration Mike Galbraith <efault@gmx.de> - 2017-02-22 16:50 +0100

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