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Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early in boot

From Pasha Tatashin <pasha.tatashin@oracle.com>
Newsgroups linux.kernel
Subject Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early in boot
Date 2017-09-27 15:20 +0200
Message-ID <uukpP-3b4-3@gated-at.bofh.it> (permalink)
References <ukfB7-3fk-11@gated-at.bofh.it> <ukfB8-3fk-31@gated-at.bofh.it> <uuk6u-2Hs-1@gated-at.bofh.it> <uukpP-3b4-5@gated-at.bofh.it>
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Hi Peter,

I am totally happy with removing notsc. This certainly simplifies the 
sched_clock code. Are there any issues with removing existing kernel 
parameters that I should be aware of?

Thank you,
Pasha

On 09/27/2017 09:10 AM, Peter Zijlstra wrote:
> On Wed, Sep 27, 2017 at 02:58:57PM +0200, Peter Zijlstra wrote:
>> (we're violating "notsc" in any case and really should kill that
>> option).
> 
> Something like so; in particular simple_udelay_calibrate() will issue
> RDTSC _way_ early, so there is absolutely no point in then pretending we
> can't use RDTSC for sched_clock.
>

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Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Peter Zijlstra <peterz@infradead.org> - 2017-09-27 15:00 +0200
  Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-09-27 15:20 +0200
    Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-27 16:00 +0200
      Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-09-27 19:20 +0200
      Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Peter Zijlstra <peterz@infradead.org> - 2017-09-27 20:10 +0200
        Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Peter Zijlstra <peterz@infradead.org> - 2017-09-27 20:20 +0200
          Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-28 12:10 +0200
            Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Peter Zijlstra <peterz@infradead.org> - 2017-09-28 14:00 +0200
              Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Thomas Gleixner <tglx@linutronix.de> - 2017-09-28 14:20 +0200
                Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-09-28 15:20 +0200
                Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Dou Liyang <douly.fnst@cn.fujitsu.com> - 2017-09-29 17:10 +0200
  Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early  in boot Peter Zijlstra <peterz@infradead.org> - 2017-09-27 15:20 +0200

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