Re: problems with lttng-0.5.1/ltt-control-0.5/linux-2.6.14.1

Hi Martin,

* Martin Robb ([email protected]) wrote:
> I am trying to use lttng with a Linux 2.6.14 kernel. I applied 
> patch-2.6.14-lttng-0.5.1. I compiled ltt-control-0.5-06042006. However, 
> I'm getting some run time errors. I've not used lttng before, so I'm 
> probably just misunderstanding something. Any help on this would be most 
> welcome.
> 
> When I run the command:
> 
> sudo lttctl -n trace -d -l /media/debugfs/ltt -t /tmp/trace
> 
This command looks ok

> I get the error:
> 
> Linux Trace Toolkit Trace Control
> Controlling trace : trace
> Create Trace Error: Failed to send netlink message: Connection refused
> 

It normally happen if the ltt-control.ko is not loaded/not builtin. It
is the netlink based control module.

> Thinking that it may need some sort of daemon, and noticing an lttd 
> command, I then tried:
> 
> sudo lttd -t /tmp/trace -c /media/debugfs/
> 

This one should read "-c /media/debugfs/ltt", so you would not try files
outside of LTTng's realm.

Please check if your ltt-control module is loaded appropriately and if
the ltt-control (userspace package) and lttng version match (see the
compatibility list on http://ltt.polymtl.ca). Since you are using an old
LTTng version, you might want to get a newer one and backport it, since
a _lot_ of things happened since then.

Regards,

Mathieu


> Linux Trace Toolkit Trace Daemon
> 
> Reading from relayfs directory : /media/debugfs/
> 
> Writing to trace directory : /tmp/trace
> 
> Creating trace subdirectory /tmp/trace
> 
> Channel file : /media/debugfs//uhci
> 
> Entering channel subdirectory...
> 
> Creating trace subdirectory /tmp/trace/uhci
> 
> Channel file : /media/debugfs//uhci/0000:00:1d.1
> 
> Opening file.
> 
> Channel file : /media/debugfs//uhci/0000:00:1d.0
> 
> Opening file.
> 
> Channel file : /media/debugfs//usbmon
> 
> Entering channel subdirectory...
> 
> Creating trace subdirectory /tmp/trace/usbmon
> 
> Channel file : /media/debugfs//usbmon/3s
> 
> Opening file.
> 
> Channel file : /media/debugfs//usbmon/3t
> 
> Opening file.
> 
> Channel file : /media/debugfs//usbmon/2s
> 
> Opening file.
> 
> Channel file : /media/debugfs//usbmon/2t
> 
> Opening file.
> 
> Channel file : /media/debugfs//usbmon/1s
> 
> Opening file.
> 
> Channel file : /media/debugfs//usbmon/1t
> 
> Opening file.
> 
> Error in getting the number of subbuffers: Inappropriate ioctl for device
> 
> I presume the ioctl error is the key. Here is the relevant configuration 
> from my kernel .config file:
> 
> #
> 
> # Instrumentation Support
> 
> #
> 
> CONFIG_LTT=y
> 
> CONFIG_LTT_TRACER=y
> 
> CONFIG_LTT_ALIGNMENT=y
> 
> CONFIG_LTT_HEARTBEAT=y
> 
> CONFIG_LTT_FACILITY_CORE=y
> 
> CONFIG_LTT_FACILITY_FS=y
> 
> CONFIG_LTT_FACILITY_IPC=y
> 
> CONFIG_LTT_FACILITY_KERNEL=y
> 
> CONFIG_LTT_FACILITY_KERNEL_ARCH=y
> 
> CONFIG_LTT_FACILITY_MEMORY=y
> 
> CONFIG_LTT_FACILITY_NETWORK=y
> 
> CONFIG_LTT_FACILITY_PROCESS=y
> 
> CONFIG_LTT_FACILITY_SOCKET=y
> 
> CONFIG_LTT_FACILITY_STATEDUMP=y
> 
> CONFIG_LTT_FACILITY_TIMER=y
> 
> ...
> 
> #
> 
> # Kernel hacking
> 
> #
> 
> # CONFIG_PRINTK_TIME is not set
> 
> CONFIG_DEBUG_KERNEL=y
> 
> CONFIG_MAGIC_SYSRQ=y
> 
> CONFIG_LOG_BUF_SHIFT=17
> 
> CONFIG_DETECT_SOFTLOCKUP=y
> 
> # CONFIG_SCHEDSTATS is not set
> 
> # CONFIG_DEBUG_SLAB is not set
> 
> CONFIG_DEBUG_SPINLOCK=y
> 
> CONFIG_DEBUG_SPINLOCK_SLEEP=y
> 
> # CONFIG_DEBUG_KOBJECT is not set
> 
> CONFIG_DEBUG_HIGHMEM=y
> 
> CONFIG_DEBUG_BUGVERBOSE=y
> 
> CONFIG_DEBUG_INFO=y
> 
> CONFIG_DEBUG_FS=y
> 
> # CONFIG_FRAME_POINTER is not set
> 
> CONFIG_EARLY_PRINTK=y
> 
> CONFIG_DEBUG_STACKOVERFLOW=y
> 
> CONFIG_KPROBES=y
> 
> CONFIG_DEBUG_STACK_USAGE=y
> 
> # CONFIG_DEBUG_PAGEALLOC is not set
> 
> CONFIG_4KSTACKS=y
> 
> CONFIG_X86_FIND_SMP_CONFIG=y
> 
> CONFIG_X86_MPPARSE=y
> 
> 
> Thanks,
> Martin Robb
> 
> 
> 
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> 

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68