diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-11-07 16:04:51 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2018-11-21 18:00:31 +0300 |
| commit | 744fafc787deebf26a39e6b5be36026bb2ff65fb (patch) | |
| tree | c723b9e5ce18c6f72932fa702ce20d432d790ba0 | |
| parent | 6a0b3abad9decb3c20e19baa3c442e1e5518546e (diff) | |
| download | linux-744fafc787deebf26a39e6b5be36026bb2ff65fb.tar.xz | |
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>
| -rw-r--r-- | tools/perf/builtin-trace.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 8f966c7a7d0d..c423a78b5ecd 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -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) { |