From: Jiri Olsa <jolsa@redhat.com>
To: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ingo Molnar <mingo@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Arnaldo Carvalho de Melo <acme@infradead.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
David Ahern <dsahern@gmail.com>,
linux-kernel@vger.kernel.org, Martin Cermak <mcermak@redhat.com>
Subject: [RFC] perf probe: -x option position issue
Date: Mon, 30 Mar 2015 19:46:55 +0200 [thread overview]
Message-ID: <20150330174655.GA27546@krava.redhat.com> (raw)
hi,
Martin found out following issue.. having following ex binary:
---
int main(void)
{
return 0;
}
---
following will create uprobe on main:
[root@dell-per510-01 perf]# gcc -g -o ex ex.c
[root@dell-per510-01 perf]# ./perf probe -x ./ex -a main
Added new event:
probe_ex:main (on main in /root/linux/tools/perf/ex)
You can now use it in all perf tools, such as:
perf record -e probe_ex:main -aR sleep 1
[root@dell-per510-01 perf]# cat /sys/kernel/debug/tracing/uprobe_events
p:probe_ex/main /root/linux/tools/perf/ex:0x00000000000004f6
while following will create (?) kprobe with complain in dmesg:
[root@dell-per510-01 perf]# gcc -g -o ex ex.c
[root@dell-per510-01 perf]# ./perf probe -a main -x ./ex
Added new event:
probe:main (on main in ex)
You can now use it in all perf tools, such as:
perf record -e probe:main -aR sleep 1
[root@dell-per510-01 perf]# dmesg | tail -2
[16986.182159] Could not insert probe at ex:main+0: -2
[16986.187030] This probe might be able to register aftertarget module is loaded. Continue.
that does not seem as an expected behaviour, or am I missing something?
thanks,
jirka
next reply other threads:[~2015-03-30 17:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-30 17:46 Jiri Olsa [this message]
2015-03-30 19:48 ` [RFC] perf probe: -x option position issue Arnaldo Carvalho de Melo
2015-03-31 8:04 ` Masami Hiramatsu
2015-03-31 13:33 ` Arnaldo Carvalho de Melo
2015-04-01 8:37 ` Masami Hiramatsu
2015-04-01 10:25 ` [PATCH perf/core 1/2] perf-probe: Support multiple probes on different binaries Masami Hiramatsu
2015-04-11 6:37 ` [tip:perf/core] perf probe: " tip-bot for Masami Hiramatsu
2015-04-01 10:25 ` [PATCH perf/core 2/2] perf-probe: Check the orphaned -x option Masami Hiramatsu
2015-04-01 11:11 ` Jiri Olsa
2015-04-10 6:51 ` Masami Hiramatsu
2015-04-10 13:22 ` Arnaldo Carvalho de Melo
2015-04-11 6:38 ` [tip:perf/core] perf probe: " tip-bot for Masami Hiramatsu
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