diff options
| -rw-r--r-- | tools/perf/Documentation/perf-trace.txt | 8 | ||||
| -rw-r--r-- | tools/perf/builtin-trace.c | 19 |
2 files changed, 27 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt index 631e687be4eb..fc6e43262c41 100644 --- a/tools/perf/Documentation/perf-trace.txt +++ b/tools/perf/Documentation/perf-trace.txt @@ -210,6 +210,14 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs. may happen, for instance, when a thread gets migrated to a different CPU while processing a syscall. +--map-dump:: + Dump BPF maps setup by events passed via -e, for instance the augmented_raw_syscalls + living in tools/perf/examples/bpf/augmented_raw_syscalls.c. For now this + dumps just boolean map values and integer keys, in time this will print in hex + by default and use BTF when available, as well as use functions to do pretty + printing using the existing 'perf trace' syscall arg beautifiers to map integer + arguments to strings (pid to comm, syscall id to syscall name, etc). + PAGEFAULTS ---------- diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 68a01e624ad3..1a11fe656afc 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -19,6 +19,7 @@ #include <traceevent/event-parse.h> #include <api/fs/tracing_path.h> #include <bpf/bpf.h> +#include "util/bpf_map.h" #include "builtin.h" #include "util/cgroup.h" #include "util/color.h" @@ -87,6 +88,9 @@ struct trace { *augmented; } events; } syscalls; + struct { + struct bpf_map *map; + } dump; struct record_opts opts; struct perf_evlist *evlist; struct machine *host; @@ -2997,6 +3001,9 @@ static int trace__run(struct trace *trace, int argc, const char **argv) if (err < 0) goto out_error_apply_filters; + if (trace->dump.map) + bpf_map__fprintf(trace->dump.map, trace->output); + err = perf_evlist__mmap(evlist, trace->opts.mmap_pages); if (err < 0) goto out_error_mmap; @@ -3686,6 +3693,7 @@ int cmd_trace(int argc, const char **argv) .max_stack = UINT_MAX, .max_events = ULONG_MAX, }; + const char *map_dump_str = NULL; const char *output_name = NULL; const struct option trace_options[] = { OPT_CALLBACK('e', "event", &trace, "event", @@ -3718,6 +3726,9 @@ int cmd_trace(int argc, const char **argv) OPT_CALLBACK(0, "duration", &trace, "float", "show only events with duration > N.M ms", trace__set_duration), +#ifdef HAVE_LIBBPF_SUPPORT + OPT_STRING(0, "map-dump", &map_dump_str, "BPF map", "BPF map to periodically dump"), +#endif OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"), OPT_INCR('v', "verbose", &verbose, "be more verbose"), OPT_BOOLEAN('T', "time", &trace.full_time, @@ -3812,6 +3823,14 @@ int cmd_trace(int argc, const char **argv) err = -1; + if (map_dump_str) { + trace.dump.map = bpf__find_map_by_name(map_dump_str); + if (trace.dump.map == NULL) { + pr_err("ERROR: BPF map \"%s\" not found\n", map_dump_str); + goto out; + } + } + if (trace.trace_pgfaults) { trace.opts.sample_address = true; trace.opts.sample_time = true; |