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perf trace: See if there is a map named "filtered_pids"
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>
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@ -18,6 +18,7 @@
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#include <traceevent/event-parse.h>
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#include <api/fs/tracing_path.h>
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#include <bpf/bpf.h>
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#include "builtin.h"
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#include "util/cgroup.h"
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#include "util/color.h"
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@ -99,6 +100,7 @@ struct trace {
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struct {
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size_t nr;
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pid_t *entries;
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struct bpf_map *map;
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} filter_pids;
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double duration_filter;
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double runtime_ms;
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@ -3315,6 +3317,25 @@ static int trace__parse_cgroups(const struct option *opt, const char *str, int u
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return 0;
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}
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static struct bpf_map *bpf__find_map_by_name(const char *name)
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{
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struct bpf_object *obj, *tmp;
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bpf_object__for_each_safe(obj, tmp) {
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struct bpf_map *map = bpf_object__find_map_by_name(obj, name);
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if (map)
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return map;
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}
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return NULL;
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}
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static void trace__set_bpf_map_filtered_pids(struct trace *trace)
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{
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trace->filter_pids.map = bpf__find_map_by_name("pids_filtered");
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}
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int cmd_trace(int argc, const char **argv)
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{
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const char *trace_usage[] = {
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@ -3451,8 +3472,10 @@ int cmd_trace(int argc, const char **argv)
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goto out;
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}
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if (evsel)
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if (evsel) {
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trace.syscalls.events.augmented = evsel;
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trace__set_bpf_map_filtered_pids(&trace);
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}
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err = bpf__setup_stdout(trace.evlist);
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if (err) {
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