perf trace: See if there is a map named "filtered_pids" (744fafc7) · Commits · 戴 / test

Lookup for the first map named "filtered_pids" and, if augmenting syscalls, i.e. if a BPF event is present and the "__augmented_syscalls__" is present, then fill in that map with the pids to filter, be it feedback loop ones (perf trace's pid, its father if it is "sshd", more auto-filtered in the future) or the ones explicitely stated in the tool command line via --filter-pids. The code to actually fill in the map comes next. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-rhzytmw7qpe6lqyjxi1ded9t@git.kernel.org Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-trace.c

+24 −1

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@

		#include <traceevent/event-parse.h>
		#include <api/fs/tracing_path.h>
		#include <bpf/bpf.h>
		#include "builtin.h"
		#include "util/cgroup.h"
		#include "util/color.h"
		@@ -99,6 +100,7 @@ struct trace {
		struct {
		size_t nr;
		pid_t *entries;
		struct bpf_map *map;
		} filter_pids;
		double duration_filter;
		double runtime_ms;
		@@ -3315,6 +3317,25 @@ static int trace__parse_cgroups(const struct option opt, const char str, int u
		return 0;
		}

		static struct bpf_map bpf__find_map_by_name(const char name)
		{
		struct bpf_object obj, tmp;

		bpf_object__for_each_safe(obj, tmp) {
		struct bpf_map *map = bpf_object__find_map_by_name(obj, name);
		if (map)
		return map;

		}

		return NULL;
		}

		static void trace__set_bpf_map_filtered_pids(struct trace *trace)
		{
		trace->filter_pids.map = bpf__find_map_by_name("pids_filtered");
		}

		int cmd_trace(int argc, const char **argv)
		{
		const char *trace_usage[] = {
		@@ -3451,8 +3472,10 @@ int cmd_trace(int argc, const char **argv)
		goto out;
		}

		if (evsel)
		if (evsel) {
		trace.syscalls.events.augmented = evsel;
		trace__set_bpf_map_filtered_pids(&trace);
		}

		err = bpf__setup_stdout(trace.evlist);
		if (err) {

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