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Re: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical Profiling Extension

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On Thu, Jun 15, 2017 at 10:57:35AM -0500, Kim Phillips wrote:
> On Mon, 12 Jun 2017 11:20:48 -0500
> Kim Phillips <kim.phillips@arm.com> wrote:
> 
> > On Mon, 12 Jun 2017 12:08:23 +0100
> > Mark Rutland <mark.rutland@arm.com> wrote:
> > 
> > > On Mon, Jun 05, 2017 at 04:22:52PM +0100, Will Deacon wrote:
> > > > This is the sixth posting of the patches previously posted here:
> ...
> > > Kim, do you have any version of the userspace side that we could look
> > > at?
> > > 
> > > For review, it would be really helpful to have something that can poke
> > > the PMU, even if it's incomplete or lacking polish.
> > 
> > Here's the latest push, based on a a couple of prior versions of this
> > driver:
> > 
> > http://linux-arm.org/git?p=linux-kp.git;a=shortlog;h=refs/heads/armspev0.1
> > 
> > I don't seem to be able to get any SPE data output after rebasing on
> > this version of the driver.  Still don't know why at the moment...
> 
> Bisected to commit e38ba76deef "perf tools: force uncore events to
> system wide monitoring".  So, using record with specifying a -C
> <cpu> explicitly now produces SPE data, but only a couple of valid
> records at the beginning of each buffer; the rest is filled with
> PADding (0's).
> 
> I see Mark's latest comments have found a possible issue in the perf
> aux buffer handling code in the driver, and that the driver does some
> memset of padding (0's) itself; could that be responsible for the above
> behaviour?

Possibly. Do you know how big you're mapping the aux buffer and what (if
any) value you're passing as aux_watermark?

Will

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Re: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical Profiling  Extension Will Deacon <will.deacon@arm.com> - 2017-06-21 18:50 +0200
  Re: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical  Profiling Extension Kim Phillips <kim.phillips@arm.com> - 2017-06-22 18:00 +0200
    Re: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical Profiling  Extension Will Deacon <will.deacon@arm.com> - 2017-06-22 20:40 +0200
      Re: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical  Profiling Extension Kim Phillips <kim.phillips@arm.com> - 2017-06-27 23:10 +0200
        Re: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical Profiling  Extension Mark Rutland <mark.rutland@arm.com> - 2017-06-28 13:30 +0200
          Re: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical Profiling  Extension Mark Rutland <mark.rutland@arm.com> - 2017-06-28 13:40 +0200
            Re: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical  Profiling Extension Kim Phillips <kim.phillips@arm.com> - 2017-06-29 03:20 +0200
              [PATCH] perf tools: Add ARM Statistical Profiling Extensions (SPE)  support Kim Phillips <kim.phillips@arm.com> - 2017-06-29 03:50 +0200
                Re: [PATCH] perf tools: Add ARM Statistical Profiling Extensions  (SPE) support Mark Rutland <mark.rutland@arm.com> - 2017-06-30 16:10 +0200
          Re: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical  Profiling Extension Kim Phillips <kim.phillips@arm.com> - 2017-06-29 03:10 +0200
            Re: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical Profiling  Extension Mark Rutland <mark.rutland@arm.com> - 2017-06-29 13:20 +0200

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