Re: [PATCH] perf tools: Allocate id array in perf_event__synthesize_event_update_cpus

From: Jiri Olsa <jolsa@redhat.com>
To: John Garry <john.garry@huawei.com>
Cc: Andi Kleen <ak@linux.intel.com>, Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Linuxarm <linuxarm@huawei.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Will Deacon <will.deacon@arm.com>,
	Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH] perf tools: Allocate id array in perf_event__synthesize_event_update_cpus
Date: Wed, 3 Oct 2018 16:16:27 +0200	[thread overview]
Message-ID: <20181003141627.GA6341@krava> (raw)
In-Reply-To: <594506a2-8cb3-3d09-82ab-5cb6d8c31ed0@huawei.com>

On Wed, Oct 03, 2018 at 03:08:10PM +0100, John Garry wrote:
> On 03/10/2018 12:36, Jiri Olsa wrote:
> > On Tue, Oct 02, 2018 at 01:16:21PM +0200, Jiri Olsa wrote:
> > > On Tue, Oct 02, 2018 at 11:41:36AM +0100, John Garry wrote:
> > > 
> > > SNIP
> > > 
> > > > > 
> > > > > 
> > > > > ---
> > > > > diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> > > > > index 1ec1d9bc2d63..fb2a0dab3978 100644
> > > > > --- a/tools/perf/util/header.c
> > > > > +++ b/tools/perf/util/header.c
> > > > > @@ -29,6 +29,7 @@
> > > > >  #include "symbol.h"
> > > > >  #include "debug.h"
> > > > >  #include "cpumap.h"
> > > > > +#include "thread_map.h"
> > > > >  #include "pmu.h"
> > > > >  #include "vdso.h"
> > > > >  #include "strbuf.h"
> > > > > @@ -3579,6 +3580,11 @@ perf_event__synthesize_event_update_cpus(struct perf_tool *tool,
> > > > > 	if (!evsel->own_cpus)
> > > > > 		return 0;
> > > > > 
> > > > > +	if (!evsel->id ||
> > > > 
> > > > for my test, evsel->id is NULL
> > > > 
> > > > > +	    perf_evsel__alloc_id(evsel, cpu_map__nr(evsel->cpus),
> > > > > +				 thread_map__nr(evsel->threads)))
> > > > 
> > > > and then this function is not called as we return immediately. So did you
> > > > really want this:
> > > > 
> > > > if (!evsel->id && perf_evsel__alloc_id(...))
> > > > 	return -ENOMEM;
> > > 
> > > ugh.. yes ;-) thanks for the fix.. I'll double
> > > check the logic and post the patch this week
> > 
> > actualy, we also need to populate those ids ;-)
> > so calling perf_evsel__store_ids instead..
> > attaching the full patch
> > 
> > thanks,
> > jirka
> > 
> 
> Hi Jirka,
> 
> Can you please double-check your new patch, as I'm getting this now:
> root@localhost:~# ./perf_debug record -e armv8_pmuv3_0/br_mis_pred/ sleep 1
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.001 MB perf.data (6 samples) ]
> root@localhost:~# ./perf_debug report
> 0xe8 [0]: failed to process type: 461
> Error:
> failed to process sample
> # To display the perf.data header info, please use --header/--header-only
> option
> #
> root@localhost:~#

ok, I need to get a machine to test this.. but it looks like
any sample-able events with cpumask are in arm :-\ will try
to get some..

jirka