[tip:perf/core] perf evsel: Print state of perf_event_attr.write_backward

[tip-bot for Arnaldo Carvalho de Melo <tipbot@zytor.com>]

Commit-ID:  0a241ef4a27a00807fefdf913da104a4534c606a
Gitweb:     http://git.kernel.org/tip/0a241ef4a27a00807fefdf913da104a4534c606a
Author:     Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Mon, 9 May 2016 18:08:33 -0300
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 9 May 2016 18:11:27 -0300

perf evsel: Print state of perf_event_attr.write_backward

Now we can see if it is set when using verbose mode in various tools,
such as 'perf test':

  # perf test -vv back
  45: Test backward reading from ring buffer                   :
  --- start ---
  <SNIP>
  ------------------------------------------------------------
  perf_event_attr:
    type                             2
    size                             112
    config                           0x98
    { sample_period, sample_freq }   1
    sample_type                      IP|TID|TIME|CPU|PERIOD|RAW
    disabled                         1
    mmap                             1
    comm                             1
    task                             1
    sample_id_all                    1
    exclude_guest                    1
    mmap2                            1
    comm_exec                        1
    write_backward                   1
  ------------------------------------------------------------
  sys_perf_event_open: pid 20911  cpu -1  group_fd -1  flags 0x8
  <SNIP>
  ---- end ----
  Test backward reading from ring buffer: Ok
  #

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-kxv05kv9qwl5of7rzfeiiwbv@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/evsel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 3371721..a23f547 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1316,6 +1316,7 @@ int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
 	PRINT_ATTRf(comm_exec, p_unsigned);
 	PRINT_ATTRf(use_clockid, p_unsigned);
 	PRINT_ATTRf(context_switch, p_unsigned);
+	PRINT_ATTRf(write_backward, p_unsigned);
 
 	PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
 	PRINT_ATTRf(bp_type, p_unsigned);