perf evlist: Introduce append_tp_filter() method (53c92f73) · Commits · 戴 / test

Will be used by 'perf trace' to support 'perf trace --filter', we need to append to any pre-existing filter. When parse_filter() gets invoked to process --filter, it'll set the filter to that specified on the command line, later on, when we filter out 'perf trace' own pid to avoid an event feedback loop, we need to preserve the command line filter put in place by parse_filter(). Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-h9rot08qmxlnfmte0holt68x@git.kernel.org Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evlist.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -1068,6 +1068,26 @@ int perf_evlist__set_tp_filter(struct evlist evlist, const char filter)
		return err;
		}

		int perf_evlist__append_tp_filter(struct evlist evlist, const char filter)
		{
		struct evsel *evsel;
		int err = 0;

		if (filter == NULL)
		return -1;

		evlist__for_each_entry(evlist, evsel) {
		if (evsel->core.attr.type != PERF_TYPE_TRACEPOINT)
		continue;

		err = perf_evsel__append_tp_filter(evsel, filter);
		if (err)
		break;
		}

		return err;
		}

		static char asprintf__tp_filter_pids(size_t npids, pid_t pids)
		{
		char *filter;

tools/perf/util/evlist.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -140,6 +140,8 @@ int perf_evlist__set_tp_filter(struct evlist evlist, const char filter);
		int perf_evlist__set_tp_filter_pid(struct evlist *evlist, pid_t pid);
		int perf_evlist__set_tp_filter_pids(struct evlist evlist, size_t npids, pid_t pids);

		int perf_evlist__append_tp_filter(struct evlist evlist, const char filter);

		struct evsel *
		perf_evlist__find_tracepoint_by_id(struct evlist *evlist, int id);

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