linux-kernel - Re: [PATCH] perf evsel: Don't set sample_regs_intr/sample_regs

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Date:   Fri, 17 Jul 2020 08:38:58 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     "Jin, Yao" <yao.jin@...ux.intel.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Ian Rogers <irogers@...gle.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <Linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>, kan.liang@...el.com,
        "Jin, Yao" <yao.jin@...el.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH] perf evsel: Don't set sample_regs_intr/sample_regs_user
 for dummy event

Em Fri, Jul 17, 2020 at 04:30:21PM +0800, Jin, Yao escreveu:
> 
> 
> On 7/17/2020 4:24 PM, Jiri Olsa wrote:
> > On Fri, Jul 17, 2020 at 11:33:46AM +0800, Jin, Yao wrote:
> > > Hi,
> > > 
> > > On 7/6/2020 8:55 AM, Jin, Yao wrote:
> > > > Hi Ian,
> > > > 
> > > > On 7/6/2020 8:47 AM, Ian Rogers wrote:
> > > > > On Fri, Jul 3, 2020 at 5:31 PM Jin, Yao <yao.jin@...ux.intel.com> wrote:
> > > > > > 
> > > > > > Hi Jiri,
> > > > > > 
> > > > > > On 7/3/2020 7:00 PM, Jiri Olsa wrote:
> > > > > > > On Fri, Jul 03, 2020 at 08:42:15AM +0800, Jin Yao wrote:
> > > > > > > > Since commit 0a892c1c9472 ("perf record: Add dummy event during system wide synthesis"),
> > > > > > > > a dummy event is added to capture mmaps.
> > > > > > > > 
> > > > > > > > But if we run perf-record as,
> > > > > > > > 
> > > > > > > >     # perf record -e cycles:p -IXMM0 -a -- sleep 1
> > > > > > > >     Error:
> > > > > > > >     dummy:HG: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'
> > > > > > > > 
> > > > > 
> > > > > Sorry for the breakage caused by modifying the dummy event. Could we
> > > > > add a test to cover the issue? Perhaps in tools/perf/tests/shell/.
> > > > > Trying to reproduce with a register on my skylakex on a 5.6.14 kernel
> > > > > with:
> > > > > 
> > > > > $ perf record -e cycles:p -IAX -a -- sleep 1
> > > > > 
> > > > > succeeds.
> > > > > 
> > > > > Thanks,
> > > > > Ian
> > > > > 
> > > > 
> > > > -IAX should be no problem. The issue only occurs on the platform with
> > > > extended regs supports, such as ICL. So I don't know if it's suitable to
> > > > add it to perf test suite.
> > > > 
> > > > Thanks
> > > > Jin Yao
> > > > 
> > > 
> > > Can this fix patch be accepted?
> > 
> > hi,
> > my only concern was that it would conflict with Adrian's patch,
> > other than that:
> > 
> > Acked-by: Jiri Olsa <jolsa@...hat.com>
> > 
> > thanks,
> > jirka
> > 
> 
> Thanks Jiri!
> 
> Adrian's patch has not been merged otherwise I can rebase my patch on top of Adrian's patch.

I'll check this today.

- Arnaldo