Commit-ID:  2b04e0f88291c0dc7e12459bd3c3661d42209b4e
Gitweb:     http://git.kernel.org/tip/2b04e0f88291c0dc7e12459bd3c3661d42209b4e
Author:     Jiri Olsa <jo...@kernel.org>
AuthorDate: Fri, 21 Jul 2017 14:12:09 +0200
Committer:  Arnaldo Carvalho de Melo <a...@redhat.com>
CommitDate: Tue, 25 Jul 2017 11:23:53 -0300

perf evsel: Add verbose output for sys_perf_event_open fallback

Adding info about what is being switched off in the sys_perf_event_open
fallback.

New output (notice the 'switching off' lines):

  $ perf stat -e '{cycles,instructions}' -vvv ls
  Using CPUID GenuineIntel-6-3D
  intel_pt default config: tsc
  ------------------------------------------------------------
  perf_event_attr:
    size                             112
    sample_type                      IDENTIFIER
    read_format                      
TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING|ID|GROUP
    disabled                         1
    inherit                          1
    enable_on_exec                   1
    exclude_guest                    1
  ------------------------------------------------------------
  sys_perf_event_open: pid 3591  cpu -1  group_fd -1  flags 0x8
  sys_perf_event_open failed, error -22
  switching off cloexec flag
  ------------------------------------------------------------
  perf_event_attr:
    size                             112
    sample_type                      IDENTIFIER
    read_format                      
TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING|ID|GROUP
    disabled                         1
    inherit                          1
    enable_on_exec                   1
    exclude_guest                    1
  ------------------------------------------------------------
  sys_perf_event_open: pid 3591  cpu -1  group_fd -1  flags 0
  sys_perf_event_open failed, error -22
  switching off exclude_guest, exclude_host
  ------------------------------------------------------------
  perf_event_attr:
    size                             112
    sample_type                      IDENTIFIER
    read_format                      
TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING|ID|GROUP
    disabled                         1
    inherit                          1
    enable_on_exec                   1
  ------------------------------------------------------------
  sys_perf_event_open: pid 3591  cpu -1  group_fd -1  flags 0
  sys_perf_event_open failed, error -22
  switching off sample_id_all
  ------------------------------------------------------------
  perf_event_attr:
    size                             112
    sample_type                      IDENTIFIER
    read_format                      
TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING|ID|GROUP
    disabled                         1
    inherit                          1
    enable_on_exec                   1
  ...

Signed-off-by: Jiri Olsa <jo...@kernel.org>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Andi Kleen <a...@firstfloor.org>
Cc: David Ahern <dsah...@gmail.com>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Link: http://lkml.kernel.org/r/20170721121212.21414-2-jo...@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
---
 tools/perf/util/evsel.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 6dd069a..450b5fa 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1671,31 +1671,39 @@ try_fallback:
         */
        if (!perf_missing_features.write_backward && 
evsel->attr.write_backward) {
                perf_missing_features.write_backward = true;
+               pr_debug2("switching off write_backward\n");
                goto out_close;
        } else if (!perf_missing_features.clockid_wrong && 
evsel->attr.use_clockid) {
                perf_missing_features.clockid_wrong = true;
+               pr_debug2("switching off clockid\n");
                goto fallback_missing_features;
        } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
                perf_missing_features.clockid = true;
+               pr_debug2("switching off use_clockid\n");
                goto fallback_missing_features;
        } else if (!perf_missing_features.cloexec && (flags & 
PERF_FLAG_FD_CLOEXEC)) {
                perf_missing_features.cloexec = true;
+               pr_debug2("switching off cloexec flag\n");
                goto fallback_missing_features;
        } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
                perf_missing_features.mmap2 = true;
+               pr_debug2("switching off mmap2\n");
                goto fallback_missing_features;
        } else if (!perf_missing_features.exclude_guest &&
                   (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
                perf_missing_features.exclude_guest = true;
+               pr_debug2("switching off exclude_guest, exclude_host\n");
                goto fallback_missing_features;
        } else if (!perf_missing_features.sample_id_all) {
                perf_missing_features.sample_id_all = true;
+               pr_debug2("switching off sample_id_all\n");
                goto retry_sample_id;
        } else if (!perf_missing_features.lbr_flags &&
                        (evsel->attr.branch_sample_type &
                         (PERF_SAMPLE_BRANCH_NO_CYCLES |
                          PERF_SAMPLE_BRANCH_NO_FLAGS))) {
                perf_missing_features.lbr_flags = true;
+               pr_debug2("switching off branch sample type no 
(cycles/flags)\n");
                goto fallback_missing_features;
        }
 out_close:

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