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SubjectRe: [PATCH 0/4] tracing: More synthetic event error fixes
Hi Tom,

On Fri, 16 Oct 2020 16:48:21 -0500
Tom Zanussi <zanussi@kernel.org> wrote:

> Hi,
>
> This patchset addresses the synthetic event error anomalies reported
> by Masami in the last patchset [1].
>
> It turns out that most of the problems boil down to clunky separator
> parsing; adding a couple new abilities to trace_run_command() and then
> adapting the existing users seemed to me the best way to fix these
> things, and also gets rid of some code.

Thanks for your work! But I think the interface design is a bit add-hoc.
I sent a comment mail on [1/4]. Let's discuss on the thread.

> Also, to make things easier for error display, I changed these to
> preserve the original command string and pass it through the callback
> instead of rebuilding it for error display.

trace_*probe reconstruct the input from argv, are there any reason
synthetic event can not do the same thing?
(this means the command on error message can be a bit different,
see __trace_probe_log_err() in kernel/trace/trace_probe.c)

>
> I added some new error strings and removed unused ones as well, and
> added a bunch of new test cases to the synthetic parser error test
> case.

Good.

>
> I didn't see any problems running the entire ftrace testsuite or the
> test modules that also use the things that were touched here.

Thanks,

>
> Thanks,
>
> Tom
>
> [1] https://lore.kernel.org/lkml/20201014110636.139df7be275d40a23b523b84@kernel.org/
>
> The following changes since commit 6107742d15832011cd0396d821f3225b52551f1f:
>
> tracing: support "bool" type in synthetic trace events (2020-10-15 12:01:14 -0400)
>
> are available in the Git repository at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/zanussi/linux-trace.git ftrace/synth-fixes-v1
>
> Tom Zanussi (4):
> tracing: Make trace_*_run_command() more flexible
> tracing: Use new trace_run_command() options
> tracing: Update synth command errors
> selftests/ftrace: Update synthetic event syntax errors
>
> kernel/trace/trace.c | 41 ++++++++--
> kernel/trace/trace.h | 12 ++-
> kernel/trace/trace_dynevent.c | 4 +-
> kernel/trace/trace_events_synth.c | 79 ++++---------------
> kernel/trace/trace_kprobe.c | 5 +-
> kernel/trace/trace_uprobe.c | 5 +-
> .../trigger-synthetic_event_syntax_errors.tc | 17 ++--
> 7 files changed, 78 insertions(+), 85 deletions(-)
>
> --
> 2.17.1
>


--
Masami Hiramatsu <mhiramat@kernel.org>

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