From: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Alexis Berlemont <alexis.berlemont@gmail.com>,
linux-kernel@vger.kernel.org, peterz@infradead.org,
mingo@redhat.com, acme@kernel.org,
alexander.shishkin@linux.intel.com, Jiri Olsa <jolsa@redhat.com>,
Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Subject: Re: [PATCH v5 0/2] perf probe: add sdt probes arguments into the uprobe cmd string
Date: Tue, 24 Jan 2017 12:28:19 +0530 [thread overview]
Message-ID: <5886FB0B.40901@linux.vnet.ibm.com> (raw)
In-Reply-To: <20161214073656.GB1635@gmail.com>
On Wednesday 14 December 2016 01:06 PM, Ingo Molnar wrote:
> * Alexis Berlemont <alexis.berlemont@gmail.com> wrote:
>
>> Hi Masami,
>>
>> Many thanks for your mail.
>>
>> Here is another patch set which tries to fix the points you mentioned:
>>
>> * Skip the arguments containing a constant ($123);
>> * Review the code in charge of the register renaming (search for '%'
>> and parse it);
>> * Minor changes (print the argument in case of error, skipping, check
>> the sdt arg type index);
>>
>> Many thanks,
>>
>> Alexis.
>>
>> Alexis Berlemont (2):
>> perf sdt: add scanning of sdt probles arguments
>> perf probe: add sdt probes arguments into the uprobe cmd string
> I'd like to hijack this thread to report an SDT oddity - one of my boxen reports
> lots of SDT tracepoints in 'perf list':
>
> mem:<addr>[/len][:access] [Hardware breakpoint]
>
> sdt_libc:lll_lock_wait_private [SDT event]
> sdt_libc:longjmp [SDT event]
> sdt_libc:longjmp_target [SDT event]
> sdt_libc:memory_arena_new [SDT event]
> sdt_libc:memory_arena_retry [SDT event]
> sdt_libc:memory_arena_reuse [SDT event]
> sdt_libc:memory_arena_reuse_free_list [SDT event]
> sdt_libc:memory_arena_reuse_wait [SDT event]
> sdt_libc:memory_calloc_retry [SDT event]
> sdt_libc:memory_heap_free [SDT event]
> ...
>
> But none of them work:
>
> Error: No permissions to read /sys/kernel/debug/tracing/events/sdt_libc/longjmp
> Hint: Try 'sudo mount -o remount,mode=755 /sys/kernel/debug/tracing'
>
> ...
>
> Error: File /sys/kernel/debug/tracing/events/sdt_libc/longjmp not found.
> Hint: Perhaps this kernel misses some CONFIG_ setting to enable this feature?.
>
> What kind of patches are required for SDT probes to work?
Hi Ingo,
I suppose you are trying to record SDT events without probing it.
In that case, first put a probe on an event and then try to record
it. For example,
$ ./perf list | grep sdt_
sdt_glib:main__after_prepare [SDT event]
sdt_glib:main__before_dispatch [SDT event]
...
$ ./perf record -a -e sdt_glib:main__after_prepare
event syntax error: 'sdt_glib:main__after_prepare'
\___ unknown tracepoint
Error: File /sys/kernel/debug/tracing/events/sdt_glib/main__after_prepare not found.
Hint: Perhaps this kernel misses some CONFIG_ setting to enable this feature?.
...
$ ./perf probe sdt_glib:main__after_prepare
Added new events:
sdt_glib:main__after_prepare (on %main__after_prepare in /usr/lib64/libglib-2.0.so.0.5000.2)
sdt_glib:main__after_prepare_1 (on %main__after_prepare in /usr/lib64/libglib-2.0.so.0.5000.2)
You can now use it in all perf tools, such as:
perf record -e sdt_glib:main__after_prepare_1 -aR sleep 1
$ ./perf record -a -e sdt_glib:main__after_prepare
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.191 MB perf.data ]
-Ravi
next prev parent reply other threads:[~2017-01-24 6:58 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-16 23:55 [PATCH 0/2] perf: add support of SDT probes arguments Alexis Berlemont
2016-11-16 23:56 ` [PATCH 1/2] perf sdt: add scanning of sdt probles arguments Alexis Berlemont
2016-11-16 23:56 ` [PATCH 2/2] perf probe: add sdt probes arguments into the uprobe cmd string Alexis Berlemont
2016-11-17 9:04 ` Hemant Kumar
2016-11-18 23:56 ` [PATCH v2 0/2] " Alexis Berlemont
2016-11-18 23:56 ` [PATCH v2 1/2] perf sdt: add scanning of sdt probles arguments Alexis Berlemont
2016-11-25 14:40 ` Arnaldo Carvalho de Melo
2016-11-26 0:58 ` [PATCH v4 0/2] perf probe: add sdt probes arguments into the uprobe cmd string Alexis Berlemont
2016-12-05 23:42 ` Alexis Berlemont
2016-12-06 14:45 ` Arnaldo Carvalho de Melo
2016-11-26 0:58 ` [PATCH v4 1/2] perf sdt: add scanning of sdt probles arguments Alexis Berlemont
2016-12-07 2:44 ` Masami Hiramatsu
2016-11-26 0:58 ` [PATCH v4 2/2] perf probe: add sdt probes arguments into the uprobe cmd string Alexis Berlemont
2016-12-07 3:26 ` Masami Hiramatsu
2016-12-09 15:14 ` Arnaldo Carvalho de Melo
2016-12-10 10:00 ` Masami Hiramatsu
2016-12-14 0:07 ` [PATCH v5 0/2] " Alexis Berlemont
2016-12-14 7:36 ` Ingo Molnar
2017-01-23 11:23 ` Ravi Bangoria
2017-02-22 22:41 ` Alexis Berlemont
2017-01-24 6:58 ` Ravi Bangoria [this message]
2017-01-24 8:22 ` Ingo Molnar
2017-01-24 8:36 ` Ravi Bangoria
2017-02-02 11:11 ` [PATCH 0/5] perf/sdt: Argument support for x86 and powepc Ravi Bangoria
2017-02-02 11:11 ` [PATCH 1/5] perf/sdt: Show proper hint Ravi Bangoria
2017-02-02 13:40 ` Ingo Molnar
2017-02-02 16:20 ` Arnaldo Carvalho de Melo
2017-02-03 10:26 ` [PATCH v2] " Ravi Bangoria
2017-02-03 15:18 ` Arnaldo Carvalho de Melo
2017-02-07 7:53 ` Ingo Molnar
2017-02-07 15:50 ` Arnaldo Carvalho de Melo
2017-02-07 8:00 ` Ingo Molnar
2017-02-16 10:16 ` [RFC] perf/sdt: Directly record SDT event with 'perf record' Ravi Bangoria
2017-02-20 7:08 ` Ingo Molnar
2017-02-20 8:21 ` Ravi Bangoria
2017-02-20 8:42 ` Ingo Molnar
2017-02-20 11:01 ` Ravi Bangoria
2017-02-20 14:11 ` Arnaldo Carvalho de Melo
2017-02-23 8:13 ` Ravi Bangoria
2017-02-23 12:48 ` Arnaldo Carvalho de Melo
2017-02-07 1:13 ` [PATCH v2] perf/sdt: Show proper hint Masami Hiramatsu
2017-02-10 7:44 ` [tip:perf/core] perf sdt: Show proper hint when event not yet in place via 'perf probe' tip-bot for Ravi Bangoria
2017-02-02 11:11 ` [PATCH 2/5] perf/sdt/x86: Add renaming logic for rNN and other registers Ravi Bangoria
2017-02-07 3:11 ` Masami Hiramatsu
2017-03-21 14:08 ` Arnaldo Carvalho de Melo
2017-03-24 18:45 ` [tip:perf/core] perf sdt x86: " tip-bot for Ravi Bangoria
2017-02-02 11:11 ` [PATCH 3/5] perf/sdt/x86: Move OP parser to tools/perf/arch/x86/ Ravi Bangoria
2017-02-07 3:11 ` Masami Hiramatsu
2017-02-07 5:22 ` Ravi Bangoria
2017-03-21 14:10 ` Arnaldo Carvalho de Melo
2017-03-21 23:00 ` Masami Hiramatsu
2017-03-22 11:22 ` Arnaldo Carvalho de Melo
2017-03-21 14:55 ` Masami Hiramatsu
2017-02-02 11:11 ` [PATCH 4/5] perf/sdt/powerpc: Add argument support Ravi Bangoria
2017-02-02 11:11 ` [PATCH 5/5] perf/probe: Change MAX_CMDLEN Ravi Bangoria
2017-02-07 1:40 ` Masami Hiramatsu
2017-02-07 5:45 ` [PATCH v2] " Ravi Bangoria
2017-03-21 5:19 ` Masami Hiramatsu
2017-03-21 13:37 ` Arnaldo Carvalho de Melo
2017-03-24 18:43 ` [tip:perf/core] perf probe: " tip-bot for Ravi Bangoria
2017-02-07 2:55 ` [PATCH 0/5] perf/sdt: Argument support for x86 and powepc Masami Hiramatsu
2017-03-06 7:53 ` Ravi Bangoria
2017-03-06 13:42 ` Masami Hiramatsu
2017-03-21 5:08 ` [PATCH v5 0/2] perf probe: add sdt probes arguments into the uprobe cmd string Masami Hiramatsu
2016-12-14 0:07 ` [PATCH v5 1/2] perf sdt: add scanning of sdt probles arguments Alexis Berlemont
2017-03-06 13:39 ` Masami Hiramatsu
2017-03-21 13:52 ` Arnaldo Carvalho de Melo
2017-03-24 18:44 ` [tip:perf/core] perf sdt: Add scanning of sdt probes arguments tip-bot for Alexis Berlemont
2016-12-14 0:07 ` [PATCH v5 2/2] perf probe: add sdt probes arguments into the uprobe cmd string Alexis Berlemont
2017-01-24 8:50 ` Ravi Bangoria
2017-03-06 17:23 ` Masami Hiramatsu
2017-03-24 18:44 ` [tip:perf/core] perf probe: Add " tip-bot for Alexis Berlemont
2016-11-18 23:56 ` [PATCH v2 2/2] perf probe: add " Alexis Berlemont
2016-11-21 10:25 ` Hemant Kumar
2016-11-24 23:13 ` [PATCH v3 0/2] " Alexis Berlemont
2016-11-24 23:13 ` [PATCH v3 1/2] perf sdt: add scanning of sdt probles arguments Alexis Berlemont
2016-11-24 23:13 ` [PATCH v3 2/2] perf probe: add sdt probes arguments into the uprobe cmd string Alexis Berlemont
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