Hello,
I get this error with perf probe, :
perf probe -vvv -x /opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so
'_ZN13CollectedHeap24common_mem_allocate_initE11KlassHandlemP6Thread'
probe-definition(0):
_ZN13CollectedHeap24common_mem_allocate_initE11KlassHandlemP6Thread
symbol:_ZN13CollectedHeap24common_mem_allocate_initE11KlassHandlemP6Thread
file:(null) line:0 offset:0 return:0 lazy:(null)
0 arguments
Opening /sys/kernel/debug/tracing/uprobe_events write=1
Added new event:
snprintf() failed: -7
Error: Failed to add events. Reason: Argument list too long (Code: -7)
it looks like it's failing here: ./util/probe-event.c
probe_trace_event__set_name
/* Get an unused new event name */
ret = get_new_event_name(buf, 64, event,
namelist, allow_suffix);
It works with a function 63 chars long not 64.
Knowing it is the event name erroring, It also works if I give the
event a short name eg. 'a'. I don't understand why it creates 3 probes
though?
objdump -t /opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so|grep
\.text|awk 'length($NF) == 63 {print length($NF)" "$NF}'|head -1
63 _ZL34bulk_revoke_or_rebias_at_safepointP7oopDescbbP10JavaThread
perf probe -vvv -x /opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so
'_ZL34bulk_revoke_or_rebias_at_safepointP7oopDescbbP10JavaThread'
probe-definition(0):
_ZL34bulk_revoke_or_rebias_at_safepointP7oopDescbbP10JavaThread
symbol:_ZL34bulk_revoke_or_rebias_at_safepointP7oopDescbbP10JavaThread
file:(null) line:0 offset:0 return:0 lazy:(null)
0 arguments
Opening /sys/kernel/debug/tracing/uprobe_events write=1
Added new event:
Writing event:
p:probe_libjvm/_ZL34bulk_revoke_or_rebias_at_safepointP7oopDescbbP10JavaThread
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so:0x325a20
probe_libjvm:_ZL34bulk_revoke_or_rebias_at_safepointP7oopDescbbP10JavaThread
(on _ZL34bulk_revoke_or_rebias_at_safepointP7oopDescbbP10JavaThread in
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so)
You can now use it in all perf tools, such as:
perf record -e
probe_libjvm:_ZL34bulk_revoke_or_rebias_at_safepointP7oopDescbbP10JavaThread
-aR sleep 1
perf probe -vvv -x /opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so
'a=_Z17do_write_prologueIP17GlobalTraceBufferEvR15JfrBufferWriterT_'
probe-definition(0):
a=_Z17do_write_prologueIP17GlobalTraceBufferEvR15JfrBufferWriterT_
symbol:_Z17do_write_prologueIP17GlobalTraceBufferEvR15JfrBufferWriterT_
file:(null) line:0 offset:0 return:0 lazy:(null)
0 arguments
Opening /sys/kernel/debug/tracing/uprobe_events write=1
Added new events:
Writing event: p:probe_libjvm/a
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so:0x8ca940
probe_libjvm:a (on
_Z17do_write_prologueIP17GlobalTraceBufferEvR15JfrBufferWriterT_ in
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so)
Writing event: p:probe_libjvm/a_1
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so:0x9c07fe
probe_libjvm:a_1 (on
_Z17do_write_prologueIP17GlobalTraceBufferEvR15JfrBufferWriterT_ in
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so)
Writing event: p:probe_libjvm/a_2
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so:0x9c25c1
probe_libjvm:a_2 (on
_Z17do_write_prologueIP17GlobalTraceBufferEvR15JfrBufferWriterT_ in
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so)
You can now use it in all perf tools, such as:
perf record -e probe_libjvm:a_2 -aR sleep 1
perf probe -l
probe_libjvm:a (on
_Z17do_write_prologueIP17GlobalTraceBufferEvR15JfrBufferWriterT_ in
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so)
probe_libjvm:a_1 (on
_Z17do_write_prologueIP17GlobalTraceBufferEvR15JfrBufferWriterT_ in
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so)
probe_libjvm:a_2 (on
_Z17do_write_prologueIP17GlobalTraceBufferEvR15JfrBufferWriterT_ in
/opt/jdk1.8.0_60/jre/lib/amd64/server/libjvm.so)
uname -a
Linux vagrant-ubuntu-trusty-64 4.3.0-999-generic #201510112200 SMP Mon
Oct 12 02:01:41 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Thanks,
Alex
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