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

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Date:	Tue, 4 Jan 2011 15:33:38 +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

No improvement with this patch.

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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