perf evsel: Rename set_filter to apply_filter

We need to be able to go on constructing a complex filter in multiple
stages, since we can only set one filter per event.

For instance, we need to be able, in 'perf trace' to filter by the
'common_pid' field all the time, if only for the tracer itself, to
avoid a feedback loop, and, in addition, we may want to filter the
raw_syscalls:sys_{enter,exit} events by its 'id' filter, when using
'perf trace -e open,close' or 'perf trace -e !open,close', i.e. when
we are interested in just a subset of syscalls or when we are not
interested in it.

So we will have:

   perf_evsel__set_filter(evsel, char *filter)

       Replaces whatever is in evsel->filter.

   perf_evsel__append_filter(evsel, const char *op, char *filter)

       Appends, using op ("&&" or "||") with what is in evsel->filter.

   perf_evsel__apply_filter(evsel, filter):

        That actually applies a filter, be it the one being
        constructed in evsel->filter, or any other, for tools
        with more specific ways to build the filter, issuing
        the appropriate ioctl for all the evsel fds.

The same changes will be made to the evlist__{set,apply} variants to
keep everything consistent.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-2s5z9xtpnc2lwio3cv5x0jek@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evlist.c

@@ -1161,7 +1161,7 @@ int perf_evlist__apply_filters(struct perf_evlist *evlist, struct perf_evsel **e
 		if (evsel->filter == NULL)
 			continue;
 
-		err = perf_evsel__set_filter(evsel, ncpus, nthreads, evsel->filter);
+		err = perf_evsel__apply_filter(evsel, ncpus, nthreads, evsel->filter);
 		if (err) {
 			*err_evsel = evsel;
 			break;
@@ -1179,7 +1179,7 @@ int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
 		  nthreads = thread_map__nr(evlist->threads);
 
 	evlist__for_each(evlist, evsel) {
-		err = perf_evsel__set_filter(evsel, ncpus, nthreads, filter);
+		err = perf_evsel__apply_filter(evsel, ncpus, nthreads, filter);
 		if (err)
 			break;
 	}

tools/perf/util/evsel.c

@@ -815,8 +815,8 @@ static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthrea
 	return 0;
 }
 
-int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
-			   const char *filter)
+int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
+			     const char *filter)
 {
 	return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
 				     PERF_EVENT_IOC_SET_FILTER,

tools/perf/util/evsel.h

@@ -182,8 +182,8 @@ void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
 			       bool use_sample_identifier);
 
-int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
-			   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, int ncpus, int nthreads);
 
 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,