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Wang Nan 30372f04c9 perf script: Print bpf-output events in 'perf script' 
This patch allows 'perf script' output messages from BPF program.  For
example, use test_bpf_output_3.c at the end of this commit message,

  # ./perf record -e bpf-output/no-inherit,name=evt/ \
                 -e ./test_bpf_output_3.c/map:channel.event=evt/ \
                 usleep 100000

  # ./perf script
          usleep  4882 21384.532523:                       evt:  ffffffff810e97d1 sys_nanosleep ([kernel.kallsyms])
      BPF output: 0000: 52 61 69 73 65 20 61 20  Raise a
                  0008: 42 50 46 20 65 76 65 6e  BPF even
                  0010: 74 21 00 00              t!..
      BPF string: "Raise a BPF event!"

          usleep  4882 21384.632606:                       evt:  ffffffff8105c609 kretprobe_trampoline_holder ([kernel.kallsyms
      BPF output: 0000: 52 61 69 73 65 20 61 20  Raise a
                  0008: 42 50 46 20 65 76 65 6e  BPF even
                  0010: 74 21 00 00              t!..
      BPF string: "Raise a BPF event!"

Two samples from BPF output are printed by both binary and string
format.

If BPF program output something unprintable, string format is
suppressed.

  /************************ BEGIN **************************/
  #include <uapi/linux/bpf.h>
  struct bpf_map_def {
         unsigned int type;
         unsigned int key_size;
         unsigned int value_size;
         unsigned int max_entries;
  };
  #define SEC(NAME) __attribute__((section(NAME), used))
  static u64 (*ktime_get_ns)(void) =
         (void *)BPF_FUNC_ktime_get_ns;
  static int (*trace_printk)(const char *fmt, int fmt_size, ...) =
         (void *)BPF_FUNC_trace_printk;
  static int (*get_smp_processor_id)(void) =
         (void *)BPF_FUNC_get_smp_processor_id;
  static int (*perf_event_output)(void *, struct bpf_map_def *, int, void *, unsigned long) =
         (void *)BPF_FUNC_perf_event_output;

  struct bpf_map_def SEC("maps") channel = {
         .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
         .key_size = sizeof(int),
         .value_size = sizeof(u32),
         .max_entries = __NR_CPUS__,
  };

  static inline int __attribute__((always_inline))
  func(void *ctx, int type)
  {
         char output_str[] = "Raise a BPF event!";

         perf_event_output(ctx, &channel, get_smp_processor_id(),
                           &output_str, sizeof(output_str));
         return 0;
  }
  SEC("func_begin=sys_nanosleep")
  int func_begin(void *ctx) {return func(ctx, 1);}
  SEC("func_end=sys_nanosleep%return")
  int func_end(void *ctx) { return func(ctx, 2);}
  char _license[] SEC("license") = "GPL";
  int _version SEC("version") = LINUX_VERSION_CODE;
  /************************* END ***************************/

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1456312845-111583-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 		2016-02-24 12:09:24 -03:00
..
Documentation perf record: Add --all-user/--all-kernel options 2016-02-18 10:48:44 -03:00
arch perf tools: Rename parse_events__free_terms() to parse_events_terms__delete() 2016-02-12 17:09:17 -03:00
bench perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
config perf build: Add libcrypto feature detection 2016-02-05 09:46:45 -03:00
jvmti perf jvmti: Add check for java alternatives cmd in Makefile 2016-02-16 17:12:46 -03:00
python perf python: Support the PERF_RECORD_SWITCH event 2015-10-07 19:41:50 -03:00
scripts perf python scripting: Append examples to err msg about audit-libs-python 2016-02-12 11:30:27 -03:00
tests perf tools: Apply tracepoint event definition options to BPF script 2016-02-22 13:02:44 -03:00
trace/strace/groups perf trace: Add read/write to the file group 2015-09-04 13:22:06 -03:00
ui perf tools: Fix assertion failure on dynamic entry 2016-02-22 12:07:14 -03:00
util perf tools: Make binary data printer code in trace_event public available 2016-02-24 11:38:01 -03:00
.gitignore perf tools: Add Intel PT instruction decoder 2015-08-17 11:11:36 -03:00
Build perf tools: Set and pass DOCDIR to builtin-report.c 2016-01-12 12:42:07 -03:00
CREDITS
…
MANIFEST perf tools: Add missing sources to perf's MANIFEST 2016-01-11 12:09:25 -03:00
Makefile perf build tests: Do parallell builds with 'build-test' 2016-02-04 15:57:00 -03:00
Makefile.perf perf build: Add EXTRA_LDFLAGS option to makefile 2016-02-12 11:30:20 -03:00
builtin-annotate.c perf hists: Introduce perf_evsel__output_resort function 2016-02-03 11:13:11 -03:00
builtin-bench.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-buildid-cache.c perf tools: Move timestamp creation to util 2016-01-29 17:30:06 -03:00
builtin-buildid-list.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-config.c perf config: Add '--system' and '--user' options to select which config file is used 2016-02-12 10:54:46 -03:00
builtin-data.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-diff.c perf diff: Use perf_hpp__register_sort_field interface 2016-01-08 12:59:30 -03:00
builtin-evlist.c perf evlist: Add --trace-fields option to show trace fields 2016-01-08 14:23:02 -03:00
builtin-help.c perf help: No need to use strbuf_remove() 2016-02-23 16:18:37 -03:00
builtin-inject.c perf inject: Add jitdump mmap injection support 2016-02-05 09:46:45 -03:00
builtin-kmem.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-kvm.c perf kvm/powerpc: Port perf kvm stat to powerpc 2016-01-29 17:49:54 -03:00
builtin-list.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-lock.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-mem.c perf mem: Introduce perf_mem_events__name function 2016-02-24 10:11:52 -03:00
builtin-probe.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-record.c perf record: Apply config to BPF objects before recording 2016-02-22 12:28:02 -03:00
builtin-report.c perf report: Check error during report__collapse_hists() 2016-02-19 19:17:50 -03:00
builtin-sched.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-script.c perf script: Print bpf-output events in 'perf script' 2016-02-24 12:09:24 -03:00
builtin-stat.c perf stat: Bail out on unsupported event config modifiers 2016-02-19 19:12:49 -03:00
builtin-timechart.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-top.c perf top: Move UI initialization ahead of sort setup 2016-02-03 12:24:03 -03:00
builtin-trace.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-version.c perf tools: Move cmd_version() to builtin-version.c 2015-12-09 13:42:03 -03:00
builtin.h perf tools: Add 'perf config' command 2015-11-23 18:31:24 -03:00
command-list.txt perf tools: Do not show trace command if it's not compiled in 2016-01-08 12:46:17 -03:00
design.txt perf tools: Update some code references in design.txt 2014-03-18 18:17:06 -03:00
perf-archive.sh perf archive: Make 'f' the last parameter for tar 2012-09-17 13:10:42 -03:00
perf-completion.sh perf tools: Avoid confusion with preloaded bash function for perf bash completion 2015-03-19 13:53:27 -03:00
perf-read-vdso.c perf tools: Build programs to copy 32-bit compatibility 2014-10-29 10:32:48 -02:00
perf-sys.h perf tools: Move generic barriers out of perf-sys.h 2015-05-08 16:05:08 -03:00
perf-with-kcore.sh perf tools: Fix perf-with-kcore handling of arguments containing spaces 2015-08-06 16:48:27 -03:00
perf.c perf tools: Initialize libapi debug output 2016-02-16 17:12:59 -03:00
perf.h perf record: Add --all-user/--all-kernel options 2016-02-18 10:48:44 -03:00