From: Milian Wolff <milian.wolff@kdab.com>
To: linux-perf-users@vger.kernel.org
Subject: LBR unwinding for user defined dynamic trace point
Date: Tue, 15 Sep 2015 15:12:02 +0200 [thread overview]
Message-ID: <2495974.rH49Pff4SO@milian-kdab2> (raw)
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Hey all,
I just tried to use LBR with a user defined dynamic trace point and get a
strange error message:
$ sudo perf probe -x /lib64/libc.so.6 malloc
$ sudo perf record -e probe_libc:malloc --call-graph lbr -F 1000 ./foo
Error:
The sys_perf_event_open() syscall returned with 95 (Operation not supported)
for event (probe_libc:malloc).
/bin/dmesg may provide additional information.
No CONFIG_PERF_EVENTS=y kernel support configured?
When I do the same with the Dwarf unwinder, it works just fine. Using the LBR
unwinder with a performance counter like instructions also works fine. Does
anyone know what the issue is here?
--
Milian Wolff | milian.wolff@kdab.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts
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next reply other threads:[~2015-09-15 13:12 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-15 13:12 Milian Wolff [this message]
2015-09-15 14:02 ` LBR unwinding for user defined dynamic trace point Andi Kleen
2015-09-16 9:55 ` Milian Wolff
2015-09-16 18:56 ` Andi Kleen
2016-04-07 15:05 ` Milian Wolff
2016-04-07 15:55 ` Andi Kleen
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