Re: First entry

* Salvatore Lionetti ([email protected]) wrote:
> Hi,
> 
> 1st time i use LTT. My projects is related to audio I/O from sound card on usb bus and i'd like to investigate about why read()/write() sometime take toolong time.
> 
> I've linux-2.6.15, so reading the version guide, i have
> lttng                0.5.36
> ltt-control        0.1
> ltt-modules      0.11
> ltt-userstracer 0.6
> genevent         !installed
> trace maj.min   !installed
> ltt-viewer          0.8.34
> 
> and this kernel configuration:
> CONFIG_LTT=y
> CONFIG_LTT_TRACER=y
> CONFIG_LTT_ALIGNMENT=y
> # CONFIG_LTT_HEARTBEAT is not set
> CONFIG_LTT_USERSPACE_GENERIC=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_NETWORK_IP_INTERFACE=y
> CONFIG_LTT_FACILITY_PROCESS=y
> CONFIG_LTT_FACILITY_SOCKET=y
> CONFIG_LTT_FACILITY_STATEDUMP=y
> CONFIG_LTT_FACILITY_TIMER=y
> # CONFIG_LTT_FACILITY_STACK_ARCH is not set
> 
> Steps followed:
> mount debugfs -> /mnt/debugfs
> mount relayfs -> /mnt/relayfs
> insmod ltt-{control, statedump}.ko
> lttv-gui
>     Channel dir: /mnt/relayfs/ltt
>     Trace direc: /tmp/trace1
>     Trace name: trace
>     Trace mode: normal
>     Start demon
>     #ltt Threads: 1
>     ...
> 
>     start
>     stop
>     upload data: Cannot open trace: maybe you should enter in the dir2select?
> 
> From shell i see:
>     Executing (as root) : exec /usr/local/bin/lttctl -l /mnt/relayfs/ltt -t /tmp/trace1 -n trace -m normal -d -N 1
>     Password:
>     Linux Trace Toolkit Trace Control
> 
>     Controlling trace : trace
> 
>     Linux Trace Toolkit Trace Daemon
> 
>     Reading from relayfs directory : /mnt/relayfs/ltt/trace
>     Writing to trace directory : /tmp/trace1
> 
>     signal 17 received
> 
> After closing lttv i got:
>      ** (lttv.real:12949): WARNING **: cannot open trace /tmp/trace1
>     *** glibc detected *** free(): invalid pointer: 0x0828def0 ***
>     /usr/local/bin/lttv-gui: line 10: 12949 Aborted                 $LTTV_CMD.real -m     guievents -m guifilter -m guicontrolflow -m guistatistics -m guitracecontrol
>  
> How can i see somethings in ltt viewer gui?
> Tank you4your attention
> 
> Have a good day
> 

Those versions are really old. Can you try with newer ones ? Say with a
kernel around 2.6.18-2.6.19 ?

> 
> 
> 
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-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
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