linux-kernel - Re: [PATCH v3 0/7] perf: Add ioctl for PMU driver configuration

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Date:   Tue, 14 Aug 2018 10:15:56 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Kim Phillips <kim.phillips@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>, ast@...nel.org,
        Greg KH <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>, suzuki.poulosi@....com,
        linux-s390@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 0/7] perf: Add ioctl for PMU driver configuration

On Mon, 13 Aug 2018 at 11:46, Kim Phillips <kim.phillips@....com> wrote:
>
> On Wed, 18 Jul 2018 15:48:00 -0600
> Mathieu Poirier <mathieu.poirier@...aro.org> wrote:
>
> > This set adds the capability to communiate event specific configuration
> > to the PMU kernel driver using an ioctl().  The functionatlity is made
> > generic enough for anyone to use but is targeted at the identification
> > of CoreSight sinks when operating in CPU-wide trace scenarios.
> >
> > ---
> > Changes for V3:
> > . Return an error for CPU-wide scenarios while the feature is being
> >   implemented (Kim)
>
> Hi, I'm giving this series a short test-drive on Juno.

Hi,

>
> It yields success for the --per-thread case..:
>
> $ sudo taskset -c 0 ./perf record -e cs_etm/@...10000.etf/ --per-thread uname -a
> Linux juno 4.18.0-rc8-00011-gb82af52c4b35-dirty #147 SMP PREEMPT Thu Aug 9 11:20:37 CDT 2018 aarch64 GNU/Linux
> [ perf record: Woken up 0 times to write data ]
> Warning:
> AUX data lost 1 times out of 2!
>
> [ perf record: Captured and wrote 0.067 MB perf.data ]
> $
>
> ..but not for CPU-wide?:
>
> $ sudo taskset -c 0 ./perf record -e cs_etm/@...10000.etf/ uname -a
> failed to mmap with 12 (Cannot allocate memory)
> $ sudo taskset -c 0 ./perf record -e cs_etm/@...10000.etf/ -C 0 uname -a
> failed to mmap with 12 (Cannot allocate memory)
> $

This patchset is getting very old and a fair amount of things have
changed since then.  I'm hoping to be coming out with a new one
shortly.  Nonetheless the above is returning an error in CPU-wide
scenarios while the feature is being implemented.  Isn't what you
requested or have I misunderstood your comment?

>
> Thanks,
>
> Kim