Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

Mathieu Desnoyers
2006-09-17T05:38:56Z

* Ingo Molnar (mingo@elte.hu) wrote:
>
> * Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> wrote:
>
> > > > Third run : same LTTng instrumentation, with a kprobe handler
> > > > triggered by each event traced.
> > >
> > > where exactly did you put the kprobe handler?
> >
> > ltt_relay_reserve_slot.
> >
> > See http://ltt.polymtl.ca/svn/tests/kernel/test-kprobes.c to insert
> > the kprobe. Tests done on LTTng 0.5.111, on a x86 3GHz with
> > hyperthreading.
>
> ok. In what way did you enable LTTng instrumentation? I have 0.5.108
> installed, and i'd like to make sure i do everything as you did, to make
> the tests comparable. Which kernel config options (default ones?), and
> what precise lttcl commands did you use, were they the usual:
>
> lttctl -n trace -d -l /mnt/debugfs/ltt -t /tmp/trace
>
> ? What filesystem does /tmp/trace reside on?
>

I used LTTng 0.5.111 (yes, now with debugfs!) ;).

I ran the tests on a Pentium 4 3 GHz, with hyperthreading enabled. The system
has 1GB of ram. Hard disk : WDC WD1600JD-00H. File system : ext3.

The kernel (2.6.17) is configured with SMP enabled.

Relevant kernel config :

CONFIG_LTT=y
CONFIG_LTT_TRACER=m
CONFIG_LTT_RELAY=m
CONFIG_LTT_ALIGNMENT=y
CONFIG_LTT_HEARTBEAT=y
CONFIG_LTT_HEARTBEAT_EVENT=y
# CONFIG_LTT_SYNTHETIC_TSC is not set
CONFIG_LTT_USERSPACE_GENERIC=y
CONFIG_LTT_NETLINK_CONTROL=m
CONFIG_LTT_STATEDUMP=m
CONFIG_LTT_FACILITY_CORE=y
CONFIG_LTT_FACILITY_FS=y
CONFIG_LTT_FACILITY_FS_DATA=y
CONFIG_LTT_FACILITY_IPC=y
CONFIG_LTT_FACILITY_KERNEL=y
CONFIG_LTT_FACILITY_KERNEL_ARCH=y
# CONFIG_LTT_FACILITY_LOCKING is not set
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=y
CONFIG_LTT_PROCESS_STACK=y
CONFIG_LTT_PROCESS_MAX_FUNCTION_STACK=100
CONFIG_LTT_PROCESS_MAX_STACK_LEN=250
CONFIG_LTT_KERNEL_STACK=y
CONFIG_LTT_STACK_SYSCALL=y
CONFIG_LTT_STACK_INTERRUPT=y
CONFIG_LTT_STACK_NMI=y

Huge note : I left CONFIG_LTT_FACILITY_STACK enabled, but THIS IS EXPERIMENTAL.

lttctl commands :

Start tracing :
lttctl -n trace -d -l /mnt/debugfs/ltt -t /tmp/trace1
(note : 0.5.111 uses debugfs, 0.5.108 uses relayfs)

Stop tracing :
lttctl -n trace -R

See http://ltt.polymtl.ca > QUICKSTART for other details (modules to load...)

Mathieu

OpenPGP public key: http://krystal.dyndns.org:8080/key/compudj.gpg
Key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68