linux-kernel - Re: [GIT PULL||RFC 00/11] perf library and regression testing improvements

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Date:	Tue, 4 Jan 2011 15:46:48 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Han Pingtian <phan@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...e.hu
Subject: Re: [GIT PULL||RFC 00/11] perf library and regression testing improvements

On Tue, Jan 4, 2011 at 3:36 PM, Arnaldo Carvalho de Melo
<acme@...radead.org> wrote:
> Em Tue, Jan 04, 2011 at 03:33:38PM +0100, Stephane Eranian escreveu:
>> No improvement with this patch.
>
> I was guessing you were using it somehow without calling
> perf_evsel__alloc_counts, now I guess you're just using what is in
> tip/perf/core, no local changes, right?
>
I am using:
git://git.eu.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-tip.git

> Next step: there are anonymous structs inside anonymous unions, what
> compiler/distro?
Yes, I am looking at those right now.
>
gcc 4.4.3 or gcc 4.2.4 (ubuntu hardy or 10.04).

> - Arnaldo
>
>> On Tue, Jan 4, 2011 at 3:27 PM, Arnaldo Carvalho de Melo
>> <acme@...radead.org> wrote:
>> > Em Tue, Jan 04, 2011 at 12:19:58PM -0200, Arnaldo Carvalho de Melo escreveu:
>> >> Em Tue, Jan 04, 2011 at 03:09:08PM +0100, Stephane Eranian escreveu:
>> >> > Arnaldo,
>> >> > Looks like what's wrong is not ps but count:
>> >> >
>> >> > Program received signal SIGSEGV, Segmentation fault.
>> >> > [Switching to Thread 0x7f96967fd6e0 (LWP 5156)]
>> >> > 0x0000000000412b58 in read_counter_aggr (counter=0x7d4820) at builtin-stat.c:206
>> >> > 206                 update_stats(&ps->res_stats[i], count[i]);
>> >> > (gdb) print ps
>> >> > $1 = (struct perf_stat *) 0x7d48a0
>> >> > (gdb) print *ps
>> >> > $2 = {res_stats = {{n = 0, mean = 0, M2 = 0}, {n = 0, mean = 0, M2 =
>> >> > 0}, {n = 0, mean = 0, M2 = 0}}}
>> >> > (gdb) print count
>> >> > $3 = (u64 *) 0x12
>> >> > (gdb) print *count
>> >> > Cannot access memory at address 0x12
>> >> > (gdb) print count
>> >> > $4 = (u64 *) 0x12
>> >>
>> >> Count is:
>> >>
>> >> u64 *count = counter->counts->aggr.values;
>> >
>> > Can you try with this patch?
>> >
>> > diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
>> > index 02b2d80..7876b11 100644
>> > --- a/tools/perf/builtin-stat.c
>> > +++ b/tools/perf/builtin-stat.c
>> > @@ -196,12 +196,14 @@ static inline int nsec_counter(struct perf_evsel *evsel)
>> >  static int read_counter_aggr(struct perf_evsel *counter)
>> >  {
>> >        struct perf_stat *ps = counter->priv;
>> > -       u64 *count = counter->counts->aggr.values;
>> > +       u64 *count;
>> >        int i;
>> >
>> >        if (__perf_evsel__read(counter, cpus->nr, threads->nr, scale) < 0)
>> >                return -1;
>> >
>> > +       count = counter->counts->aggr.values;
>> > +
>> >        for (i = 0; i < 3; i++)
>> >                update_stats(&ps->res_stats[i], count[i]);
>> >
>> > diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
>> > index d337761..26962ea 100644
>> > --- a/tools/perf/util/evsel.c
>> > +++ b/tools/perf/util/evsel.c
>> > @@ -89,8 +89,12 @@ int __perf_evsel__read(struct perf_evsel *evsel,
>> >  {
>> >        size_t nv = scale ? 3 : 1;
>> >        int cpu, thread;
>> > -       struct perf_counts_values *aggr = &evsel->counts->aggr, count;
>> > +       struct perf_counts_values *aggr, count;
>> >
>> > +       if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, ncpus) < 0)
>> > +               return -ENOMEM;
>> > +
>> > +       aggr = &evsel->counts->aggr;
>> >        aggr->val = 0;
>> >
>> >        for (cpu = 0; cpu < ncpus; cpu++) {
>> >
>
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