[RFC 00/11] perf tools: Enhance parsing events tracepoint error output

[Jiri Olsa]

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
  ...

I changed api/fs tracefs/debugfs related code and I'm not completely
sure what were the long term intentions with this code, so please
comment ;-)

jirka


---
Jiri Olsa (11):
      tools: Add err.h with ERR_PTR PTR_ERR interface
      perf tools: Add tracing_path and remove unneeded functions
      perf tools: Do not change lib/api/fs/debugfs directly
      perf tools: Move debugfs__strerror_open into util.c object
      perf tools: Move tracing_path stuff under same namespace
      perf tools: Move tracing_path interface into trace-event-path.c
      perf tools: Make tracing_path_strerror_open message generic
      perf tools: Do not export debugfs_mountpoint and tracefs_mountpoint
      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                  |  28 +++++++++++++++++++
 tools/lib/api/fs/debugfs.c                 |  53 +-----------------------------------
 tools/lib/api/fs/debugfs.h                 |   5 ----
 tools/lib/api/fs/tracefs.c                 |   2 +-
 tools/lib/api/fs/tracefs.h                 |   2 --
 tools/perf/builtin-trace.c                 |   4 +--
 tools/perf/perf.c                          |  11 ++++----
 tools/perf/tests/openat-syscall-all-cpus.c |   2 ++
 tools/perf/tests/openat-syscall.c          |   2 ++
 tools/perf/util/Build                      |   1 +
 tools/perf/util/evsel.c                    |   8 ++++--
 tools/perf/util/parse-events.c             |  58 ++++++++++++++++++++++++++++++----------
 tools/perf/util/parse-events.h             |   3 ++-
 tools/perf/util/parse-events.y             |  16 ++++++-----
 tools/perf/util/trace-event-path.c         | 129 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/trace-event.c              |   7 +++--
 tools/perf/util/trace-event.h              |  12 +++++++++
 tools/perf/util/util.c                     | 119 ---------------------------------------------------------------------------------
 tools/perf/util/util.h                     |   8 ------
 19 files changed, 250 insertions(+), 220 deletions(-)
 create mode 100644 tools/include/linux/err.h
 create mode 100644 tools/perf/util/trace-event-path.c
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