Hello, >> Can you share with us the code of your "hello" probe ? I used the example code from http://lttng.org/docs/#doc-instrumenting-linux-kernel-itself .
>> Which version or git commit of lttng-modules are you
>> using ?
I used the current master of the github mirrors, specifically:
lttng-tools: 94ffb05d6777efc0c40394d3df44a04feed92953
lttng-modules: d0558de29ca516e83b388b8028651f8b69288e4e
lttng-ust: 4bc1ccd721114691c6f0dbd65335b3c43c9f895f
> I think the two issues should be fixed by this new
> git commit in lttng-modules master branch:
>
> commit 66fd8d5e4a6080f1b2db0f525c26c07e5b723aab
> Author: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
> Date: Thu Apr 23 16:11:15 2015 -0400
>
> Fix: double-unlock of session mutex
>
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
>
> Can you give it a try ?
Yes, the mutex error goes away. However, loading multiple probes with
either --kmod-probes or --extra-kmod-probes still does not work:
$ sudo lttng-sessiond -vvv --extra-kmod-probes=sched,napi
[...]
DEBUG1 - 11:42:18.492870 [5358/5358]: Modprobe successfully lttng-probe-napi
(in modprobe_lttng() at modprobe.c:285)
sh: 1: Syntax error: "(" unexpected
DEBUG1 - 11:42:18.495037 [5358/5358]: Unable to load optional module (null);
continuing (in modprobe_lttng() at modprobe.c:281)
[...]
Also, lttng-probe-regmap does not compile, but that might have to do
with my kernel version of 4.0.0-rc4 (commit
b314acaccd7e0d55314d96be4a33b5f50d0b3344 from
https://github.com/torvalds/linux):
lttng-modules$ make KERNELDIR=/usr/src/linux-4.0.0-rc4-atlas+
make -C /usr/src/linux-4.0.0-rc4-atlas+
M=/home/hannesweisbach/atlas/lttng-modules modules
make[1]: Entering directory '/usr/src/linux-4.0.0-rc4-atlas+'
CC [M] /home/hannesweisbach/atlas/lttng-modules/probes/lttng-probe-regmap.o
In file included from
/home/hannesweisbach/atlas/lttng-modules/probes/../instrumentation/events/lttng-module/../../../probes/define_trace.h:100:0,
from
/home/hannesweisbach/atlas/lttng-modules/probes/../instrumentation/events/lttng-module/regmap.h:278,
from
/home/hannesweisbach/atlas/lttng-modules/probes/lttng-probe-regmap.c:41:
/home/hannesweisbach/atlas/lttng-modules/probes/../instrumentation/events/lttng-module/../../../probes/lttng-events.h:134:6:
error: conflicting types for ‘trace_regmap_reg_write’
void trace_##_name(_proto);
^
/home/hannesweisbach/atlas/lttng-modules/probes/../instrumentation/events/lttng-module/../../../probes/lttng-events.h:99:2:
note: in expansion of macro ‘LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP’
LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(template, name, name, PARAMS(proto),
PARAMS(args))
^
/home/hannesweisbach/atlas/lttng-modules/probes/../instrumentation/events/lttng-module/../../../probes/../instrumentation/events/lttng-module/regmap.h:34:1:
note: in expansion of macro ‘LTTNG_TRACEPOINT_EVENT_INSTANCE’
LTTNG_TRACEPOINT_EVENT_INSTANCE(regmap_reg, regmap_reg_write,
^
In file included from include/trace/events/regmap.h:8:0,
from
/home/hannesweisbach/atlas/lttng-modules/probes/lttng-probe-regmap.c:32:
include/linux/tracepoint.h:169:21: note: previous definition of
‘trace_regmap_reg_write’ was here
static inline void trace_##name(proto) \
^
include/linux/tracepoint.h:325:3: note: in expansion of macro ‘__DECLARE_TRACE’
__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), 1, \
^
include/linux/tracepoint.h:448:2: note: in expansion of macro ‘DECLARE_TRACE’
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
^
include/trace/events/regmap.h:40:1: note: in expansion of macro ‘DEFINE_EVENT’
DEFINE_EVENT(regmap_reg, regmap_reg_write,
^
[ and so on, and so on … ]
Since I don't need the regmap probe I simply disabled it in
probes/Makefile. Unfortunately, I don't have time to debug it myself.
If you want me to try another version, let me know.
Best regards,
Hannes
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