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SubjectRe: [PATCH v4 0/5] Add support for the ARMv8.2 Statistical Profiling Extension
On Mon, 12 Jun 2017 11:20:48 -0500
Kim Phillips <> wrote:

> On Mon, 12 Jun 2017 12:08:23 +0100
> Mark Rutland <> 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:
> 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



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