linux-kernel - Re: [PATCH 01/11] perf stat: Fix AGGR_CORE segfault on multi-socket system

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Date:	Wed, 1 Oct 2014 14:08:29 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, "H. Peter Anvin" <hpa@...or.com>,
	Matt Fleming <matt.fleming@...el.com>
Subject: Re: [PATCH 01/11] perf stat: Fix AGGR_CORE segfault on multi-socket
 system

Em Wed, Oct 01, 2014 at 03:36:22PM +0100, Matt Fleming escreveu:
> From: Matt Fleming <matt.fleming@...el.com>
> 
> When printing the stats associated with a counter in AGGR_MODE mode, the
> 'cpu' argument represents an encoded socket and core_id, not a 'cpu'.
> Using it as an index into the any of the *_stats[MAX_NR_CPUS] arrays
> generates a SIGSEGV if the encoded socket id is non-zero.
> 
> Follow the AGGR_GLOBAL case and reset the cpu index to 0.

So, is this still needed after applying Andi's patch:

  perf stat: Fix --per-core on multi socket systems

  https://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/commit/?h=perf/core&id=da88c7f78d842a6938d9adde6af87a2ce262051d

Or should this be applied on top of that one, after fixing up the
conflicts?

- Arnaldo
 
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Matt Fleming <matt.fleming@...el.com>
> ---
>  tools/perf/builtin-stat.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index b22c62f80078..53bd6b729498 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -965,7 +965,7 @@ static void abs_printout(int id, int nr, struct perf_evsel *evsel, double avg)
>  
>  	aggr_printout(evsel, id, nr);
>  
> -	if (aggr_mode == AGGR_GLOBAL)
> +	if (aggr_mode == AGGR_GLOBAL || aggr_mode == AGGR_CORE)
>  		cpu = 0;
>  
>  	fprintf(output, fmt, avg, csv_sep);
> -- 
> 1.9.3
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