linux-kernel - Re: [PATCH 1/2] perf-tool: Don't process samples with no valid machine object

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Date:	Thu, 9 Feb 2012 14:34:41 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Jason Wang <jasowang@...hat.com>
Subject: Re: [PATCH 1/2] perf-tool: Don't process samples with no valid
 machine object

Em Thu, Feb 09, 2012 at 05:07:38PM +0100, Joerg Roedel escreveu:
> The perf sample processing code relies on a valid machine
> object. Make sure that this path is only entered when such a
> object exists.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  tools/perf/builtin-top.c  |    2 +-
>  tools/perf/util/session.c |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index dd162aa..7c81d1d 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -805,7 +805,7 @@ static void perf_top__mmap_read_idx(struct perf_top *top, int idx)
>  		}
>  
>  
> -		if (event->header.type == PERF_RECORD_SAMPLE) {
> +		if (event->header.type == PERF_RECORD_SAMPLE && machine != NULL) {

Shouldn't we warn the user, even if just once, on the status (last line
on the screen) line?

>  			perf_event__process_sample(&top->tool, event, evsel,
>  						   &sample, machine);
>  		} else if (event->header.type < PERF_RECORD_MAX) {
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index b5ca2558..c9593c7 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -792,7 +792,7 @@ static int perf_session_deliver_event(struct perf_session *session,
>  	switch (event->header.type) {
>  	case PERF_RECORD_SAMPLE:
>  		dump_sample(session, event, sample);
> -		if (evsel == NULL) {
> +		if (evsel == NULL || machine == NULL) {
>  			++session->hists.stats.nr_unknown_id;
>  			return -1;
>  		}
> -- 
> 1.7.5.4
> 
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