linux-kernel - Re: [PATCH V6 1/3] perf tools: making perf_evsel__append

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Date:   Fri, 16 Sep 2016 15:43:30 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>, acme@...nel.org
Cc:     mingo@...hat.com, peterz@...radead.org,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        acme@...radead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V6 1/3] perf tools: making perf_evsel__append_filter()
 generic

On 15/09/16 19:37, Mathieu Poirier wrote:
> By making function perf_evsel__append_filter() take a format rather
> than an operator it is possible to reuse the code for other purposes
> (ex. intelPT and CoreSight) than tracepoints.

intelPT -> Intel PT

> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>

Otherwise:

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  tools/perf/builtin-trace.c     | 9 +++++++--
>  tools/perf/util/evsel.c        | 4 ++--
>  tools/perf/util/evsel.h        | 2 +-
>  tools/perf/util/parse-events.c | 4 ++--
>  4 files changed, 12 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index b8c6766301db..4c2704332c14 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -2140,6 +2140,7 @@ out_delete_sys_enter:
>  static int trace__set_ev_qualifier_filter(struct trace *trace)
>  {
>  	int err = -1;
> +	struct perf_evsel *sys_exit;
>  	char *filter = asprintf_expr_inout_ints("id", !trace->not_ev_qualifier,
>  						trace->ev_qualifier_ids.nr,
>  						trace->ev_qualifier_ids.entries);
> @@ -2147,8 +2148,12 @@ static int trace__set_ev_qualifier_filter(struct trace *trace)
>  	if (filter == NULL)
>  		goto out_enomem;
>  
> -	if (!perf_evsel__append_filter(trace->syscalls.events.sys_enter, "&&", filter))
> -		err = perf_evsel__append_filter(trace->syscalls.events.sys_exit, "&&", filter);
> +	if (!perf_evsel__append_filter(trace->syscalls.events.sys_enter,
> +				       "(%s) && (%s)", filter)) {
> +		sys_exit = trace->syscalls.events.sys_exit;
> +		err = perf_evsel__append_filter(sys_exit,
> +						"(%s) && (%s)", filter);
> +	}
>  
>  	free(filter);
>  out:
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 21fd573106ed..b93369745e08 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1046,14 +1046,14 @@ int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
>  }
>  
>  int perf_evsel__append_filter(struct perf_evsel *evsel,
> -			      const char *op, const char *filter)
> +			      const char *fmt, const char *filter)
>  {
>  	char *new_filter;
>  
>  	if (evsel->filter == NULL)
>  		return perf_evsel__set_filter(evsel, filter);
>  
> -	if (asprintf(&new_filter,"(%s) %s (%s)", evsel->filter, op, filter) > 0) {
> +	if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
>  		free(evsel->filter);
>  		evsel->filter = new_filter;
>  		return 0;
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 4d44129e050b..7ab59f15892f 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -234,7 +234,7 @@ void perf_evsel__set_sample_id(struct perf_evsel *evsel,
>  
>  int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter);
>  int perf_evsel__append_filter(struct perf_evsel *evsel,
> -			      const char *op, const char *filter);
> +			      const char *fmt, const char *filter);
>  int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
>  			     const char *filter);
>  int perf_evsel__enable(struct perf_evsel *evsel);
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 6c913c3914fb..9692300585f6 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -1762,7 +1762,7 @@ static int set_filter(struct perf_evsel *evsel, const void *arg)
>  		return -1;
>  	}
>  
> -	if (perf_evsel__append_filter(evsel, "&&", str) < 0) {
> +	if (perf_evsel__append_filter(evsel, "(%s) && (%s)", str) < 0) {
>  		fprintf(stderr,
>  			"not enough memory to hold filter string\n");
>  		return -1;
> @@ -1793,7 +1793,7 @@ static int add_exclude_perf_filter(struct perf_evsel *evsel,
>  
>  	snprintf(new_filter, sizeof(new_filter), "common_pid != %d", getpid());
>  
> -	if (perf_evsel__append_filter(evsel, "&&", new_filter) < 0) {
> +	if (perf_evsel__append_filter(evsel, "(%s) && (%s)", new_filter) < 0) {
>  		fprintf(stderr,
>  			"not enough memory to hold filter string\n");
>  		return -1;
>