poky:a62aed41f2d8f874f7ae24d0e5be5dbc66ea2199 QEMU: http://autobuilder.yoctoproject.org/pub/nightly/20130604-5/machines/qemu/qemux86-64/ STEPS TO REPRODUCE 1. Boot a core-image-sato-sdk image (e.g. qemux86-64) 2. Perform an userspace trace with lttng and view the trace EXPECTED RESULTS: 2. Trace is created and can be viewed: root@crownbay:~# lttng view [02:31:14.906146544] (+?.?????????) hello:1424 ust_tests_hello:tptest: { cpu_id = 1 }, { intfield = 0, intfield2 = 0x0, longfield = 0, netintfield = 0, netintfieldhex = 0x0, arrfield1 = [ [0] = 1, [1] = 2, [2] = 3 ], arrfield2 = "test", _seqfield1_length = 4, seqfield1 = [ [0] = 116, [1] = 101, [2] = 115, [3] = 116 ], _seqfield2_length = 4, seqfield2 = "test", stringfield = "test", floatfield = 2222, doublefield = 2, boolfield = 1 } [02:31:14.906170360] (+0.000023816) hello:1424 ust_tests_hello:tptest: { cpu_id = 1 }, { intfield = 1, intfield2 = 0x1, longfield = 1, netintfield = 1, netintfieldhex = 0x1, arrfield1 = [ [0] = 1, [1] = 2, [2] = 3 ], arrfield2 = "test", _seqfield1_length = 4, seqfield1 = [ [0] = 116, [1] = 101, [2] = 115, [3] = 116 ], _seqfield2_length = 4, seqfield2 = "test", stringfield = "test", floatfield = 2222, doublefield = 2, boolfield = 1 } [02:31:14.906183140] (+0.000012780) hello:1424 ust_tests_hello:tptest: { cpu_id = 1 }, { intfield = 2, intfield2 = 0x2, longfield = 2, netintfield = 2, netintfieldhex = 0x2, arrfield1 = [ [0] = 1, [1] = 2, [2] = 3 ], arrfield2 = "test", _seqfield1_length = 4, seqfield1 = [ [0] = 116, [1] = 101, [2] = 115, [3] = 116 ], _seqfield2_length = 4, seqfield2 = "test", stringfield = "test", floatfield = 2222, doublefield = 2, boolfield = 1 } [02:31:14.906194385] (+0.000011245) hello:1424 ust_tests_hello:tptest: { cpu_id = 1 }, { intfield = 3, intfield2 = 0x3, longfield = 3, netintfield = 3, netintfieldhex = 0x3, arrfield1 = [ [0] = 1, [1] = 2, [2] = 3 ], arrfield2 = "test", _seqfield1_length = 4, seqfield1 = [ [0] = 116, [1] = 101, [2] = 115, [3] = 116 ], _seqfield2_length = 4, seqfield2 = "test", stringfield = "test", floatfield = 2222, doublefield = 2, boolfield = 1 } . . . ACTUAL RESULTS 2. trace is not created: root@qemux86-64:~# lttng create Session auto-20130606-132154 created. Traces will be written in /home/root/lttng-traces/auto-20130606-132154 root@qemux86-64:~# lttng enable-event --userspace --all All UST events are enabled in channel channel0 root@qemux86-64:~# lttng start Tracing started for session auto-20130606-132154 root@qemux86-64:~# ./a.out Hello, World! root@qemux86-64:~# lttng stop Waiting for data availability Tracing stopped for session auto-20130606-132154 root@qemux86-64:~# lttng view Trace directory: /home/root/lttng-traces/auto-20130606-132154 [error] Cannot open any trace for reading. [error] opening trace "/home/root/lttng-traces/auto-20130606-132154" for reading. [error] none of the specified trace paths could be opened. root@qemux86-64:~# lttng destroy Session auto-20130606-132154 destroyed root@qemux86-64:~# ls a.out hello.c root@qemux86-64:~#
Please check maintainers.inc when assigning bugs: RECIPE_MAINTAINER_pn-lttng-ust = "Bogdan Marinescu <bogdan.a.marinescu@intel.com>"
Tom: I am explictly re-assinging this back to you as Bogdan has left and you are the tracing person.
There doesn't seem to be a problem here. Build Configuration: BB_VERSION = "1.19.1" BUILD_SYS = "x86_64-linux" NATIVELSBSTRING = "Fedora-17" TARGET_SYS = "i586-poky-linux" MACHINE = "crownbay" DISTRO = "poky" DISTRO_VERSION = "1.4+snapshot-20130701" TUNE_FEATURES = "m32 core2" TARGET_FPU = "" meta meta-yocto meta-yocto-bsp = "master0:80b263430453896189b704d0997943642eec6fef" meta-intel meta-crownbay = "master0:e0d6134ed2e2687ff9f2ee77701666447842bf33" root@crownbay:~# lttng create Spawning a session daemon Warning: No tracing group detected Session auto-20130701-224222 created. Traces will be written in /home/root/lttng-traces/auto-20130701-224222 root@crownbay:~# lttng enable-event --userspace --all All UST events are enabled in channel channel0 root@crownbay:~# lttng start Tracing started for session auto-20130701-224222 root@crownbay:~# ./hello Hello, World! Tracing... done. root@crownbay:~# lttng stop Waiting for data availability............................... Tracing stopped for session auto-20130701-224222 root@crownbay:~# lttng view [23:45:24.249558061] (+0.000005587) crownbay:hello:1236 ust_tests_hello:tptest: { cpu_id = 1 }, { intfield = 3295, intfield2 = 0xCDF, longfield = 3295, netintfield = 3295, netintfieldhex = 0xCDF, arrfield1 = [ [0] = 1, [1] = 2, [2] = 3 ], arrfield2 = "test", _seqfield1_length = 4, seqfield1 = [ [0] = 116, [1] = 101, [2] = 115, [3] = 116 ], _seqfield2_length = 4, seqfield2 = "test", stringfield = "test", floatfield = 2222, doublefield = 2, boolfield = 1 } [23:45:24.249563648] (+0.000005587) crownbay:hello:1236 ust_tests_hello:tptest: { cpu_id = 1 }, { intfield = 3296, intfield2 = 0xCE0, longfield = 3296, netintfield = 3296, netintfieldhex = 0xCE0, arrfield1 = [ [0] = 1, [1] = 2, [2] = 3 ], arrfield2 = "test", _seqfield1_length = 4, seqfield1 = [ [0] = 116, [1] = 101, [2] = 115, [3] = 116 ], _seqfield2_length = 4, seqfield2 = "test", stringfield = "test", floatfield = 2222, doublefield = 2, boolfield = 1 } [23:45:24.249569236] (+0.000005588) crownbay:hello:1236 ust_tests_hello:tptest: { cpu_id = 1 }, { intfield = 3297, intfield2 = 0xCE1, longfield = 3297, netintfield = 3297, netintfieldhex = 0xCE1, arrfield1 = [ [0] = 1, [1] = 2, [2] = 3 ], arrfield2 = "test", _seqfield1_length = 4, seqfield1 = [ [0] = 116, [1] = 101, [2] = 115, [3] = 116 ], _seqfield2_length = 4, seqfield2 = "test", stringfield = "test", floatfield = 2222, doublefield = 2, boolfield = 1 } [23:45:24.249574823] (+0.000005587) crownbay:hello:1236 ust_tests_hello:tptest: { cpu_id = 1 }, { intfield = 3298, intfield2 = 0xCE2, longfield = 3298, netintfield = 3298, netintfieldhex = 0xCE2, arrfield1 = [ [0] = 1, [1] = 2, [2] = 3 ], arrfield2 = "test", _seqfield1_length = 4, seqfield1 = [ [0] = 116, [1] = 101, [2] = 115, [3] = 116 ], _seqfield2_length = 4, seqfield2 = "test", stringfield = "test", floatfield = 2222, doublefield = 2, boolfield = 1 } [23:45:24.249580410] (+0.000005587) crownbay:hello:1236 ust_tests_hello:tptest: { cpu_id = 1 }, { intfield = 3299, intfield2 = 0xCE3, longfield = 3299, netintfield = 3299, netintfieldhex = 0xCE3, arrfield1 = [ [0] = 1, [1] = 2, [2] = 3 ],
Also tried with a qemux86-64 core-image-sato-sdk build and it worked fine too, so closing this.
Hi Tom, I am sorry but I have to reopen this. I have tried on real HW, crownbay-noemgd and on qemux86 & qemux86-64 sato-sdk images. It reproduces on both machines (qemu and real hw) with the same error I mentioned from above. poky: 9de0ad47462c13ac4a2d73e12e92be6c1b4e0415 crownbay: http://autobuilder03.jf.intel.com/pub/nightly-meta-intel/20130731-3/machines/crownbay-noemgd/core-image-sato-sdk-crownbay-noemgd.hddimg I really don't know why it doesn't happen to you but seems that on my machines it reproduces.
I think your problem is that you're not actually running anything that will produce a trace. Apparently lttng-ust doesn't produce the file it says it does unless something is actually traced and 'lttng view' will produce the error you see if nothing has been traced and therefore the file doesn't really exist: lttng create Spawning a session daemon Warning: No tracing group detected Session auto-20130801-095552 created. Traces will be written in /home/root/lttng-traces/auto-20130801-095552 root@crownbay-noemgd:~# lttng enable-event --userspace --all All UST events are enabled in channel channel0 root@crownbay-noemgd:~# lttng start Tracing started for session auto-20130801-095552 root@crownbay-noemgd:~# lttng stop Waiting for data availability Tracing stopped for session auto-20130801-095552 root@crownbay-noemgd:~# lttng view Trace directory: /home/root/lttng-traces/auto-20130801-095552 [error] Cannot open any trace for reading. [error] opening trace "/home/root/lttng-traces/auto-20130801-095552" for reading. [error] none of the specified trace paths could be opened. root@crownbay-noemgd:~# lttng start Tracing started for session auto-20130801-095552 If you repeat the test but actually run the hello application that will generate a trace, you get: root@crownbay-noemgd:~# lttng start Tracing started for session auto-20130801-095552 root@crownbay-noemgd:~# /media/sdb/lttng-ust-hello Hello, World! Tracing... done. root@crownbay-noemgd:~# lttng stop Waiting for data availability Tracing stopped for session auto-20130801-095552 root@crownbay-noemgd:~# lttng view Trace directory: /home/root/lttng-traces/auto-20130801-095552 [09:56:50.080838531] (+?.?????????) crownbay-noemgd:lttng-ust-hello:1107 ust_tests_hello:tptest: { cpu_id = 1 }, { intfield = 0, intfield2 = 0x0, longfield = 0, netintfield = 0, netintfieldhex = 0x0, arrfield1 = [ [0] = 1, [1] = 2, [2] = 3 ], arrfield2 = "test", _seqfield1_length = 4, seqfield1 = [ [0] = 116, [1] = 101 You can find a 'hello' program that you can use for testing in: build/tmp/work/core2-poky-linux/lttng-ust/2_2.2.0-r0/build/tests/hello/.libs/hello
with the sample indicated by Tom, the trace can be viewed.