Hi, * loody ([email protected]) wrote: > hi all: > I have some questions about ltt: > 1. what is the out format about ltt? > it seems kernel.softirq_entry mean it calls softirq_entry and belongs > to kernel group
yes > but what does metadata.core_marker_format mean? group metadata (lttng trace metadta), which outputs the id/format of events. It describes the rest of the trace. > Calling core_marker_format? and what does metadata group mean? > > 2. ltt is used for monitoring kernel behavior, why there is a group > named "userspace"? It contains the events written through the debugfs file ltt/write_event. See "Userspace tracing" in the LTTng Manual on the lttng.org website. This is a "slow" tracing mode that takes a simple string as input. UST is a much faster tracer that hooks directly onto tracepoints declared in userspace code. > 3. can I monitor the system calls, "set_thread_area" and "mprotect"? Yes. But you will see them as "syscall_entry/syscall_exit" events, with the syscall number mapping to the syscall name (first event field). We don't gather the syscall arguments at this point: you'll need to add instrumentation for that. Thanks, Mathieu > I found these 2 functions in strace but cannot found it in ltt. > Should I open additional config ? -- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com _______________________________________________ ltt-dev mailing list [email protected] http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
