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* 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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