[PATCHv2 0/5] perf tools: Enhance parsing events tracepoint error output

[Jiri Olsa <jolsa@kernel.org>]

hi,
enhancing parsing events tracepoint error output. Adding
more verbose output when the tracepoint is not found or
the tracing event path cannot be access.

  $ sudo perf record -e sched:sched_krava ls
  event syntax error: 'sched:sched_krava'
                       \___ unknown tracepoint

  Error:  File /sys/kernel/debug/tracing//tracing/events/sched/sched_krava not found.
  Hint:   Perhaps this kernel misses some CONFIG_ setting to enable this feature?.

  Run 'perf list' for a list of valid events
  ...

  $ perf record -e sched:sched_krava ls
  event syntax error: 'sched:sched_krava'
                       \___ can't access trace events

  Error:  No permissions to read /sys/kernel/debug/tracing//tracing/events/sched/sched_krava
  Hint:   Try 'sudo mount -o remount,mode=755 /sys/kernel/debug'

  Run 'perf list' for a list of valid events
  ...

v2 changes:
  - debugfs/tracefs changes went already in through separate patchset
  - more commentary on err.h interface
  - fixed callers of err.h enhanced functions
  - added extra tags/cscope fix

Also available in:
  git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
  perf/tp


thanks,
jirka


---
Jiri Olsa (5):
      tools: Add err.h with ERR_PTR PTR_ERR interface
      perf tools: Add tools/include into tags directories
      perf tools: Propagate error info for the tracepoint parsing
      perf tools: Propagate error info from tp_format
      perf tools: Enhance parsing events tracepoint error output

 tools/include/linux/err.h                   | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/Makefile.perf                    |  2 +-
 tools/perf/builtin-trace.c                  | 19 +++++++++++--------
 tools/perf/tests/evsel-tp-sched.c           | 10 ++++++++--
 tools/perf/tests/openat-syscall-all-cpus.c  |  3 ++-
 tools/perf/tests/openat-syscall-tp-fields.c |  3 ++-
 tools/perf/tests/openat-syscall.c           |  3 ++-
 tools/perf/util/evlist.c                    |  3 ++-
 tools/perf/util/evsel.c                     | 11 +++++++++--
 tools/perf/util/evsel.h                     |  3 +++
 tools/perf/util/parse-events.c              | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++----------------
 tools/perf/util/parse-events.h              |  3 ++-
 tools/perf/util/parse-events.y              | 16 +++++++++-------
 tools/perf/util/trace-event.c               | 13 +++++++++++--
 14 files changed, 161 insertions(+), 43 deletions(-)
 create mode 100644 tools/include/linux/err.h