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From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: "Liang, Kan" <kan.liang@linux.intel.com>
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org,
	peterz@infradead.org, eranian@google.com, namhyung@kernel.org,
	jolsa@redhat.com, ak@linux.intel.com, yao.jin@linux.intel.com,
	maddy@linux.vnet.ibm.com
Subject: Re: [PATCH 2/9] perf tools: Support the auxiliary event
Date: Wed, 3 Feb 2021 18:30:28 -0300	[thread overview]
Message-ID: <20210203213028.GY854763@kernel.org> (raw)
In-Reply-To: <b56933e7-0454-c2ac-9bac-c9890dcc60d4@linux.intel.com>

Em Wed, Feb 03, 2021 at 04:20:38PM -0500, Liang, Kan escreveu:
> 
> 
> On 2/3/2021 3:02 PM, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Feb 02, 2021 at 12:09:06PM -0800,kan.liang@linux.intel.com  escreveu:
> > > From: Kan Liang<kan.liang@linux.intel.com>
> > > diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> > > index c26ea822..c48f6de 100644
> > > --- a/tools/perf/util/evsel.c
> > > +++ b/tools/perf/util/evsel.c
> > > @@ -2689,6 +2689,9 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
> > >   		if (perf_missing_features.aux_output)
> > >   			return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
> > >   		break;
> > > +	case ENODATA:
> > > +		return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. "
> > > +				 "Please add an auxiliary event in front of the load latency event.");
> > Are you sure this is the only case where ENODATA comes out from
> > perf_event_open()? Well, according to your comment in:
> > 
> >    61b985e3e775a3a7 ("perf/x86/intel: Add perf core PMU support for Sapphire Rapids")
> > 
> > It should be at that point in time, so its safe to merge as-is, but then
> > I think this is fragile, what if someone else, in the future, not
> > knowing that ENODATA is supposed to be used only with that ancient CPU,
> > Sapphire Rapids, uses it?:-)
> > 
> > Please consider adding a check before assuming ENODATA is for this
> > specific case.
> 
> Sure, I will add a check in V2.

Do it as a separate patch, on top of what is now in tmp.perf/core.

https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/log/?h=tmp.perf/core

- Arnaldo

  reply	other threads:[~2021-02-03 21:31 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-02 20:09 [PATCH 0/9] perf core PMU support for Sapphire Rapids (User tools) kan.liang
2021-02-02 20:09 ` [PATCH 1/9] tools headers uapi: Update tools's copy of linux/perf_event.h kan.liang
2021-02-02 20:09 ` [PATCH 2/9] perf tools: Support the auxiliary event kan.liang
2021-02-03 20:02   ` Arnaldo Carvalho de Melo
2021-02-03 21:20     ` Liang, Kan
2021-02-03 21:30       ` Arnaldo Carvalho de Melo [this message]
2021-02-05 10:52   ` Namhyung Kim
2021-02-05 14:13     ` Liang, Kan
2021-02-05 15:26       ` Arnaldo Carvalho de Melo
2021-02-05 15:45         ` Liang, Kan
2021-02-02 20:09 ` [PATCH 3/9] perf tools: Support data block and addr block kan.liang
2021-02-05 11:02   ` Namhyung Kim
2021-02-05 14:17     ` Liang, Kan
2021-02-02 20:09 ` [PATCH 4/9] perf c2c: " kan.liang
2021-02-03 20:21   ` Arnaldo Carvalho de Melo
2021-02-02 20:09 ` [PATCH 5/9] perf tools: Support PERF_SAMPLE_WEIGHT_STRUCT kan.liang
2021-02-03 20:31   ` Arnaldo Carvalho de Melo
2021-02-03 21:19     ` Liang, Kan
2021-02-03 21:29       ` Arnaldo Carvalho de Melo
2021-02-02 20:09 ` [PATCH 6/9] perf report: Support instruction latency kan.liang
2021-02-03 20:43   ` Arnaldo Carvalho de Melo
2021-02-04 13:11   ` Athira Rajeev
2021-02-04 15:19     ` Liang, Kan
2021-02-05 12:55       ` Athira Rajeev
2021-02-05 14:51         ` Liang, Kan
2021-02-07 16:45           ` Athira Rajeev
2021-02-05 11:08   ` Namhyung Kim
2021-02-05 14:38     ` Liang, Kan
2021-02-06  8:09       ` Namhyung Kim
2021-02-08 13:50         ` Liang, Kan
2021-02-02 20:09 ` [PATCH 7/9] perf test: Support PERF_SAMPLE_WEIGHT_STRUCT kan.liang
2021-02-03 20:44   ` Arnaldo Carvalho de Melo
2021-02-02 20:09 ` [PATCH 8/9] perf stat: Support L2 Topdown events kan.liang
2021-02-02 20:09 ` [PATCH 9/9] perf, tools: Update topdown documentation for Sapphire Rapids kan.liang

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