linux-kernel - Re: [PATCH v2 7/7] perf test: Test pmu-events aliases

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Date:   Tue, 17 Mar 2020 18:07:30 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     John Garry <john.garry@...wei.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        namhyung@...nel.org, will@...nel.org, ak@...ux.intel.com,
        linuxarm@...wei.com, linux-kernel@...r.kernel.org,
        james.clark@....com, qiangqing.zhang@....com
Subject: Re: [PATCH v2 7/7] perf test: Test pmu-events aliases

On Tue, Mar 17, 2020 at 04:41:04PM +0000, John Garry wrote:
> On 17/03/2020 16:20, Jiri Olsa wrote:
> > On Tue, Mar 17, 2020 at 07:02:19PM +0800, John Garry wrote:
> > 
> > SNIP
> > 
> > >   struct perf_pmu_test_event {
> > >   	struct pmu_event event;
> > > +
> > > +	/* extra events for aliases */
> > > +	const char *alias_str;
> > > +
> > > +	/*
> > > +	 * Note: For when PublicDescription does not exist in the JSON, we
> > > +	 * will have no long_desc in pmu_event.long_desc, but long_desc may
> > > +	 * be set in the alias.
> > > +	 */
> > > +	const char *alias_long_desc;
> > >   };
> > > +
> > >   static struct perf_pmu_test_event test_cpu_events[] = {
> > >   	{
> > >   		.event = {
> > > @@ -20,6 +31,8 @@ static struct perf_pmu_test_event test_cpu_events[] = {
> > >   			.desc = "L1 BTB Correction",
> > >   			.topic = "branch",
> > >   		},
> > > +		.alias_str = "event=0x8a",
> > > +		.alias_long_desc = "L1 BTB Correction",
> > >   	},
> > >   	{
> > >   		.event = {
> > > @@ -28,6 +41,8 @@ static struct perf_pmu_test_event test_cpu_events[] = {
> > >   			.desc = "L2 BTB Correction",
> > >   			.topic = "branch",
> > >   		},
> > > +		.alias_str = "event=0x8b",
> > > +		.alias_long_desc = "L2 BTB Correction",
> > >   	},
> > >   	{
> > >   		.event = {
> > > @@ -36,6 +51,8 @@ static struct perf_pmu_test_event test_cpu_events[] = {
> > >   			.desc = "Number of segment register loads",
> > >   			.topic = "other",
> > >   		},
> > > +		.alias_str = "umask=0x80,(null)=0x30d40,event=0x6",
> > 
> > ah so we are using other pmus because of the format definitions
> > 
> 
> Hi jirka,
> 
> > why is there the '(null)' in there?
> > 
> 
> Well this is just coming from the generated alias string in the pmu code,
> and it does not seem to be handling "period" argument properly. It needs to
> be checked.

nice, it found first issue already ;-)

jirka