From: Jiri Olsa <jolsa@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Olsa <jolsa@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
lkml <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>
Subject: Re: [PATCH 2/5] ftrace perf: Move exclude_kernel tracepoint check to init event
Date: Thu, 24 Mar 2016 10:56:48 +0100 [thread overview]
Message-ID: <20160324095648.GC8893@krava.brq.redhat.com> (raw)
In-Reply-To: <20160323104129.GZ6344@twins.programming.kicks-ass.net>
On Wed, Mar 23, 2016 at 11:41:29AM +0100, Peter Zijlstra wrote:
> On Wed, Mar 16, 2016 at 03:34:30PM +0100, Jiri Olsa wrote:
> > We suppress events with attr::exclude_kernel set when
> > the event is generated, so following capture will
> > give no warning but won't produce any data:
> >
> > $ sudo perf record -e sched:sched_switch:u ls
> > $ sudo /perf script | wc -l
> > 0
> >
> > Checking the attr::exclude_(kernel|user) at the event
> > init time and failing right away for tracepoints from
> > uprobes/kprobes and native ones:
> >
> > $ sudo perf record -e sched:sched_switch:u ls
> > Error:
> > The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (sched:sched_switch).
> > /bin/dmesg may provide additional information.
> > No CONFIG_PERF_EVENTS=y kernel support configured?
> >
> > $ sudo perf record -e probe:sys_read:u ls
> > Error:
> > The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (probe:sys_read).
> > /bin/dmesg may provide additional information.
> > No CONFIG_PERF_EVENTS=y kernel support configured?
> >
> > $ ./perf record -e probe_ex:main:k ./ex
> > Error:
> > The sys_perf_event_open() syscall returned with 22 (Invalid argument) for event (probe_ex:main).
> > /bin/dmesg may provide additional information.
> > No CONFIG_PERF_EVENTS=y kernel support configured?
>
> Not sure about this one. The previous behaviour suggests
> exclude_{user,kernel} is implemented, while the new behaviour says these
> flags are not implemented, which is a functional regression.
well I would not expect 'sched:sched_switch:u' to work (be implemented)
and I thought it's better to trigger an error than silently 'produce' no data
>
> That is, if all events are from kernel space, and we exclude all kernel
> events, 0 is the right answer not an error.
>
> Sure, with uprobes the situation is currently broken, but this isn't a
> fix.
next prev parent reply other threads:[~2016-03-24 9:56 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-16 14:34 [PATCHv2 0/5] ftrace perf: Fixes and speedup Jiri Olsa
2016-03-16 14:34 ` [PATCH 1/5] ftrace perf: Check sample types only for sampling events Jiri Olsa
2016-03-18 14:27 ` Steven Rostedt
2016-03-31 9:25 ` [tip:perf/core] ftrace/perf: " tip-bot for Jiri Olsa
2016-03-16 14:34 ` [PATCH 2/5] ftrace perf: Move exclude_kernel tracepoint check to init event Jiri Olsa
2016-03-18 14:28 ` Steven Rostedt
2016-03-23 10:41 ` Peter Zijlstra
2016-03-24 9:56 ` Jiri Olsa [this message]
2016-03-24 10:49 ` Peter Zijlstra
2016-03-24 12:25 ` Jiri Olsa
2016-03-24 13:00 ` Peter Zijlstra
2016-03-24 13:30 ` Jiri Olsa
2016-03-16 14:34 ` [PATCH 3/5] ftrace perf: Use ftrace_ops::private to store event pointer Jiri Olsa
2016-03-18 14:28 ` Steven Rostedt
2016-03-23 14:26 ` Peter Zijlstra
2016-03-24 9:47 ` Jiri Olsa
2016-03-24 10:40 ` Peter Zijlstra
2016-03-16 14:34 ` [PATCH 4/5] ftrace: Make ftrace_hash_rec_enable return update bool Jiri Olsa
2016-03-17 0:23 ` Namhyung Kim
2016-03-16 14:34 ` [PATCH 5/5] ftrace: Update dynamic ftrace calls only if necessary Jiri Olsa
2016-03-17 0:25 ` Namhyung Kim
2016-03-18 14:27 ` Steven Rostedt
-- strict thread matches above, loose matches on Subject: below --
2016-03-09 20:46 [RFC 0/5] ftrace perf: Fixes and speedup Jiri Olsa
2016-03-09 20:46 ` [PATCH 2/5] ftrace perf: Move exclude_kernel tracepoint check to init event Jiri Olsa
2016-03-10 0:39 ` Namhyung Kim
2016-03-11 8:39 ` Jiri Olsa
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