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Date: Mon, 01 Apr 2019 08:31:08 -0500
From: Tom Zanussi <zanussi@...nel.org>
To: Masami Hiramatsu <mhiramat@...nel.org>
Cc: rostedt@...dmis.org, tglx@...utronix.de, 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 Masami,
On Mon, 2019-04-01 at 09:19 +0700, Masami Hiramatsu wrote:
> 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>
>
Thanks!
> 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.
>
I was going to, but there are a lot of error cases and a lot of them
aren't simple one-liners and require some more involved setup to
trigger. I'll submit a follow-on patch to add them as soon as I get
the chance.
Thanks,
Tom
> 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@l
> > inux.intel.com/
> > [2] https://lore.kernel.org/lkml/20180406105309.b50ea1a21d2cbd9b0e3
> > 9dbfd@...nel.org/
> > [3] https://lore.kernel.org/lkml/e885d1fd02e76f121d6cc2bb28e58b523e
> > 2434a7.camel@...ux.intel.com/
> > [4] https://lore.kernel.org/lkml/cover.1549403369.git.tom.zanussi@l
> > inux.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.t
> > c
> > create mode 100644
> > tools/testing/selftests/ftrace/test.d/kprobe/uprobe_syntax_errors.t
> > c
> > delete mode 100644
> > tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-
> > extended-error-support.tc
> >
> > --
> > 2.14.1
> >
>
>
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