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Date: Mon, 1 Apr 2019 09:19:48 +0700
From: Masami Hiramatsu <mhiramat@...nel.org>
To: Tom Zanussi <zanussi@...nel.org>
Cc: rostedt@...dmis.org, tglx@...utronix.de, mhiramat@...nel.org,
namhyung@...nel.org, bigeasy@...utronix.de, joel@...lfernandes.org,
linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH v5 00/11] tracing: common error_log for ftrace
Hi Tom,
On Sun, 31 Mar 2019 18:48:14 -0500
Tom Zanussi <zanussi@...nel.org> wrote:
> From: Tom Zanussi <tom.zanussi@...ux.intel.com>
>
> Hi,
>
> This is v5 of the frace error_log patchset. This version updates the
> patches according to suggestions from Masami and Namhyung and moves
> some of the selftest code from the kprobe/uprobe testcases to a common
> function that can be reused by multiple testcases, including the new
> error_log testcase.
Thanks for updating!
This series looks good to me.
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
BTW, could you also add a testcase which tests all (or most of)
error cases of hist_err() ?
That will be good to find regressions in future changes.
Thanks,
>
> Changes from v4:
>
> - Merged in the >& -> 2> redirection patch into '[PATCH v5 06/11]
> selftests/ftrace: Add error_log testcase for probe errors'
> - Added new patch, '[PATCH v5 07/11] selftests/ftrace: Move
> kprobe/uprobe check_error() to test.d/functions' that adds a new
> ftrace_errlog_check() to test.d/functions, which is based on
> check_error() from '[PATCH v5 06/11] selftests/ftrace: Add
> error_log testcase for probe errors'
> - Modified the kprobe/uprobe test cases to use the common
> ftrace_errlog_check()
> - Modified the error_log test cases to display the error position
> using the common ftrace_errlog_check()
> - Updated subject for '[PATCH v5 08/11] selftests/ftrace: Remove
> trigger-extended-error-support testcase
> - Streamlined the error_log open and write file operations as
> suggested by Masami
> - Fixed the long lines in '[PATCH v4 04/11] tracing: Use tracing
> error_log with trace event filters' as suggested by Namhyung
>
> Changes from v3:
>
> - Added Masami's [PATCH 05/11] tracing: Use tracing error_log with probe events
> - Added Masami's [PATCH 06/11] selftests/ftrace: Add error_log testcase for probe
> - Added [PATCH 11/11] to fix [PATCH 06/11]
> - Removed [RFC PATCH v3 4/5] tracing: Use tracing error_log with kprobe events
> - Added [PATCH 08/11] selftests/ftrace: Add tracing/error_log testcase
> - Removed trigger-extended-error-support testcase
> - Changed [n] numbering to [timestamp] numbering as suggested by Masami
> - Updated Documentation and README
>
> Changes from v2:
>
> - Added [n] numbering as suggested by Masami
>
>
> Text from original post:
>
> Last April, I posted an RFC patchset [1] implementing a common
> error_log interface as suggested by Masami [2]. We were supposed to
> discuss it at Plumbers but that never happened, and Steve recently
> asked about patches for a follow-on discussion [3], so here they are.
>
> I incorporated comments from the previous discussion, the most
> important of which are:
>
> - Incorporated Steve's suggestion of using static strings as in the
> existing trace event filter code, along with err_info indexing into
> the string arrays and a position for the error caret.
>
> - Converted all the hist trigger errors and the existing trace event
> filter parse errors to use the new interface.
>
> - Converted a few kprobe_event errors to the new interface as
> examples, but these will require more work - I didn't spend much
> time figuring out how to get the full kprobe command into the error
> info, for instance.
>
> - Got rid of the custom single-page ring buffer and used standard
> lists instead.
>
> For now, this is implemented on top of the latest 'hist trigger
> snapshot and onchange additions' patchset [4].
>
> Below is an example session of a few failed commands and the
> corresponding error_log contents:
>
> # echo > /sys/kernel/debug/tracing/error_log
>
> # echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="cyclictest"' >> /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
> # echo 'hist:keys=pid:ts0=common_timestamp.usecs if comm=="cyclictest"' >> /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
> -su: echo: write error: Invalid argument
>
> # cat /sys/kernel/debug/tracing/error_log
> [ 217.431858] hist:sched:sched_wakeup: error: Variable already defined
> Command: keys=pid:ts0=common_timestamp.usecs if comm=="cyclictest"
> ^
>
> # echo 'hist:key=comm:p=prio:onchange($q).snapshot()' > /sys/kernel/debug/tracing/events/sched/sched_waking/trigger
> -su: echo: write error: Invalid argument
>
> # cat /sys/kernel/debug/tracing/error_log
> [ 217.431858] hist:sched:sched_wakeup: error: Variable already defined
> Command: keys=pid:ts0=common_timestamp.usecs if comm=="cyclictest"
> ^
> [ 311.554978] hist:sched:sched_waking: error: Couldn't find onmax or onchange variable
> Command: key=comm:p=prio:onchange($q).snapshot()
> ^
>
> # echo 'hist:keys=pid' >> /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
> # echo 'hist:keys=pid' >> /sys/kernel/debug/tracing/events/sched/sched_wakeup/trigger
> -su: echo: write error: File exists
> # echo 'comm="cyclictest"' > /sys/kernel/debug/tracing/events/sched/sched_wakeup/filter
> -su: echo: write error: Invalid argument
>
> # cat /sys/kernel/debug/tracing/error_log
> [ 217.431858] hist:sched:sched_wakeup: error: Variable already defined
> Command: keys=pid:ts0=common_timestamp.usecs if comm=="cyclictest"
> ^
> [ 311.554978] hist:sched:sched_waking: error: Couldn't find onmax or onchange variable
> Command: key=comm:p=prio:onchange($q).snapshot()
> ^
> [ 715.626153] hist:sched:sched_wakeup: error: Hist trigger already exists
> Command: keys=pid
> ^
> [ 730.480310] event filter parse error: error: Invalid operator
> Command: comm="cyclictest"
> ^
>
> # echo "((sig >= 10 && sig < 15) || dsig == 17) && comm != bash" > /sys/kernel/debug/tracing/events/signal/signal_generate/filter
> -su: echo: write error: Invalid argument
>
> # cat /sys/kernel/debug/tracing/error_log
> [ 217.431858] hist:sched:sched_wakeup: error: Variable already defined
> Command: keys=pid:ts0=common_timestamp.usecs if comm=="cyclictest"
> ^
> [ 311.554978] hist:sched:sched_waking: error: Couldn't find onmax or onchange variable
> Command: key=comm:p=prio:onchange($q).snapshot()
> ^
> [ 715.626153] hist:sched:sched_wakeup: error: Hist trigger already exists
> Command: keys=pid
> ^
> [ 730.480310] event filter parse error: error: Invalid operator
> Command: comm="cyclictest"
> ^
> [ 800.548673] event filter parse error: error: Field not found
> Command: ((sig >= 10 && sig < 15) || dsig == 17) && comm != bash
> ^
>
>
> Thanks,
>
> Tom
>
> [1] https://lore.kernel.org/lkml/cover.1523545519.git.tom.zanussi@linux.intel.com/
> [2] https://lore.kernel.org/lkml/20180406105309.b50ea1a21d2cbd9b0e39dbfd@kernel.org/
> [3] https://lore.kernel.org/lkml/e885d1fd02e76f121d6cc2bb28e58b523e2434a7.camel@linux.intel.com/
> [4] https://lore.kernel.org/lkml/cover.1549403369.git.tom.zanussi@linux.intel.com/
>
>
> The following changes since commit 01c4e8042fc949018b70ded769f959bc3d80e8b6:
>
> tracing: initialize variable in create_dyn_event() (2019-03-22 15:19:34 -0400)
>
> are available in the git repository at:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/zanussi/linux-trace.git ftrace/error_log_v5
>
> Masami Hiramatsu (2):
> tracing: Use tracing error_log with probe events
> selftests/ftrace: Add error_log testcase for probe errors
>
> Tom Zanussi (9):
> tracing: Add tracing error log
> tracing: Save the last hist command's associated event name
> tracing: Use tracing error_log with hist triggers
> tracing: Use tracing error_log with trace event filters
> selftests/ftrace: Move kprobe/uprobe check_error() to test.d/functions
> selftests/ftrace: Remove trigger-extended-error-support testcase
> selftests/ftrace: Add tracing/error_log testcase
> tracing: Add tracing/error_log Documentation
> tracing: Add error_log to README
>
> Documentation/trace/ftrace.rst | 31 +++
> Documentation/trace/histogram.rst | 16 +-
> kernel/trace/trace.c | 219 ++++++++++++++++
> kernel/trace/trace.h | 4 +
> kernel/trace/trace_events_filter.c | 11 +-
> kernel/trace/trace_events_hist.c | 221 +++++++++--------
> kernel/trace/trace_kprobe.c | 77 +++---
> kernel/trace/trace_probe.c | 274 +++++++++++++++------
> kernel/trace/trace_probe.h | 77 +++++-
> kernel/trace/trace_uprobe.c | 44 +++-
> .../ftrace/test.d/ftrace/tracing-error-log.tc | 19 ++
> tools/testing/selftests/ftrace/test.d/functions | 12 +
> .../ftrace/test.d/kprobe/kprobe_syntax_errors.tc | 85 +++++++
> .../ftrace/test.d/kprobe/uprobe_syntax_errors.tc | 23 ++
> .../inter-event/trigger-extended-error-support.tc | 28 ---
> 15 files changed, 874 insertions(+), 267 deletions(-)
> create mode 100644 tools/testing/selftests/ftrace/test.d/ftrace/tracing-error-log.tc
> create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/kprobe_syntax_errors.tc
> create mode 100644 tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.tc
> delete mode 100644 tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-extended-error-support.tc
>
> --
> 2.14.1
>
--
Masami Hiramatsu <mhiramat@...nel.org>
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