linux-kernel - Re: [PATCH 1/1] perf,tools: open event on evsel cpus and threads

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Date:	Fri, 21 Aug 2015 15:54:36 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	kan.liang@...el.com
Cc:	acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] perf,tools: open event on evsel cpus and threads

On Fri, Aug 21, 2015 at 02:23:14AM -0400, kan.liang@...el.com wrote:
> From: Kan Liang <kan.liang@...el.com>
> 
> evsel may have different cpus and threads as evlist's.
> Use it's own cpus and threads, when open evsel in perf record.

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> 
> Signed-off-by: Kan Liang <kan.liang@...el.com>
> ---
>  tools/perf/builtin-record.c | 2 +-
>  tools/perf/util/evlist.c    | 4 ++++
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 25cf6b4..a0178bf 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -279,7 +279,7 @@ static int record__open(struct record *rec)
>  
>  	evlist__for_each(evlist, pos) {
>  try_again:
> -		if (perf_evsel__open(pos, evlist->cpus, evlist->threads) < 0) {
> +		if (perf_evsel__open(pos, pos->cpus, pos->threads) < 0) {
>  			if (perf_evsel__fallback(pos, errno, msg, sizeof(msg))) {
>  				if (verbose)
>  					ui__warning("%s\n", msg);
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 373f65b..be6fde9 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -1179,6 +1179,10 @@ int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **e
>  		if (evsel->filter == NULL)
>  			continue;
>  
> +		/*
> +		 * filters only work for tracepoint event, which doesn't have cpu limit.
> +		 * So evlist and evsel should always be same.
> +		 */
>  		err = perf_evsel__apply_filter(evsel, ncpus, nthreads, evsel->filter);
>  		if (err) {
>  			*err_evsel = evsel;
> -- 
> 1.8.3.1
> 
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