a9cd6c6766
Using BPF for that, doing a cleverish reuse of perf_event_attr__fprintf(),
that really needs to be turned into __snprintf(), etc.
But since the plan is to go the BTF way probably use libbpf's
btf_dump__dump_type_data().
Example:
[root@quaco ~]# perf trace -e ~acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.c,perf_event_open --max-events 10 perf stat --quiet sleep 0.001
fg
0.000 perf_event_open(attr_uptr: { type: 1, size: 128, config: 0x1, sample_type: IDENTIFIER, read_format: TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING, disabled: 1, inherit: 1, enable_on_exec: 1, exclude_guest: 1 }, pid: 258859 (perf), cpu: -1, group_fd: -1, flags: FD_CLOEXEC) = 3
0.067 perf_event_open(attr_uptr: { type: 1, size: 128, config: 0x3, sample_type: IDENTIFIER, read_format: TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING, disabled: 1, inherit: 1, enable_on_exec: 1, exclude_guest: 1 }, pid: 258859 (perf), cpu: -1, group_fd: -1, flags: FD_CLOEXEC) = 4
0.120 perf_event_open(attr_uptr: { type: 1, size: 128, config: 0x4, sample_type: IDENTIFIER, read_format: TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING, disabled: 1, inherit: 1, enable_on_exec: 1, exclude_guest: 1 }, pid: 258859 (perf), cpu: -1, group_fd: -1, flags: FD_CLOEXEC) = 5
0.172 perf_event_open(attr_uptr: { type: 1, size: 128, config: 0x2, sample_type: IDENTIFIER, read_format: TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING, disabled: 1, inherit: 1, enable_on_exec: 1, exclude_guest: 1 }, pid: 258859 (perf), cpu: -1, group_fd: -1, flags: FD_CLOEXEC) = 7
0.190 perf_event_open(attr_uptr: { size: 128, sample_type: IDENTIFIER, read_format: TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING, disabled: 1, inherit: 1, enable_on_exec: 1, exclude_guest: 1 }, pid: 258859 (perf), cpu: -1, group_fd: -1, flags: FD_CLOEXEC) = 8
0.199 perf_event_open(attr_uptr: { size: 128, config: 0x1, sample_type: IDENTIFIER, read_format: TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING, disabled: 1, inherit: 1, enable_on_exec: 1, exclude_guest: 1 }, pid: 258859 (perf), cpu: -1, group_fd: -1, flags: FD_CLOEXEC) = 9
0.204 perf_event_open(attr_uptr: { size: 128, config: 0x4, sample_type: IDENTIFIER, read_format: TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING, disabled: 1, inherit: 1, enable_on_exec: 1, exclude_guest: 1 }, pid: 258859 (perf), cpu: -1, group_fd: -1, flags: FD_CLOEXEC) = 10
0.210 perf_event_open(attr_uptr: { size: 128, config: 0x5, sample_type: IDENTIFIER, read_format: TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING, disabled: 1, inherit: 1, enable_on_exec: 1, exclude_guest: 1 }, pid: 258859 (perf), cpu: -1, group_fd: -1, flags: FD_CLOEXEC) = 11
[root@quaco ~]#
Suggested-by: Ian Rogers <irogers@google.com>
Tested-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/Y2V2Tpu+2vzJyon2@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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#ifndef PERF_FLAG_FD_NO_GROUP
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# define PERF_FLAG_FD_NO_GROUP (1UL << 0)
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#endif
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#ifndef PERF_FLAG_FD_OUTPUT
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# define PERF_FLAG_FD_OUTPUT (1UL << 1)
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#endif
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#ifndef PERF_FLAG_PID_CGROUP
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# define PERF_FLAG_PID_CGROUP (1UL << 2) /* pid=cgroup id, per-cpu mode only */
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#endif
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#ifndef PERF_FLAG_FD_CLOEXEC
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# define PERF_FLAG_FD_CLOEXEC (1UL << 3) /* O_CLOEXEC */
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#endif
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static size_t syscall_arg__scnprintf_perf_flags(char *bf, size_t size,
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struct syscall_arg *arg)
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{
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bool show_prefix = arg->show_string_prefix;
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const char *prefix = "PERF_";
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int printed = 0, flags = arg->val;
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if (flags == 0)
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return 0;
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#define P_FLAG(n) \
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if (flags & PERF_FLAG_##n) { \
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printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
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flags &= ~PERF_FLAG_##n; \
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}
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P_FLAG(FD_NO_GROUP);
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P_FLAG(FD_OUTPUT);
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P_FLAG(PID_CGROUP);
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P_FLAG(FD_CLOEXEC);
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#undef P_FLAG
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if (flags)
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printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
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return printed;
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}
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#define SCA_PERF_FLAGS syscall_arg__scnprintf_perf_flags
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struct attr_fprintf_args {
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size_t size, printed;
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char *bf;
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bool first;
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};
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static int attr__fprintf(FILE *fp __maybe_unused, const char *name, const char *val, void *priv)
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{
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struct attr_fprintf_args *args = priv;
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size_t printed = scnprintf(args->bf + args->printed , args->size - args->printed, "%s%s: %s", args->first ? "" : ", ", name, val);
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args->first = false;
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args->printed += printed;
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return printed;
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}
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static size_t perf_event_attr___scnprintf(struct perf_event_attr *attr, char *bf, size_t size, bool show_zeros __maybe_unused)
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{
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struct attr_fprintf_args args = {
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.printed = scnprintf(bf, size, "{ "),
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.size = size,
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.first = true,
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.bf = bf,
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};
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perf_event_attr__fprintf(stdout, attr, attr__fprintf, &args);
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return args.printed + scnprintf(bf + args.printed, size - args.printed, " }");
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}
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static size_t syscall_arg__scnprintf_augmented_perf_event_attr(struct syscall_arg *arg, char *bf, size_t size)
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{
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return perf_event_attr___scnprintf((void *)arg->augmented.args, bf, size, arg->trace->show_zeros);
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}
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static size_t syscall_arg__scnprintf_perf_event_attr(char *bf, size_t size, struct syscall_arg *arg)
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{
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if (arg->augmented.args)
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return syscall_arg__scnprintf_augmented_perf_event_attr(arg, bf, size);
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return scnprintf(bf, size, "%#lx", arg->val);
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}
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#define SCA_PERF_ATTR syscall_arg__scnprintf_perf_event_attr
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