On Thu, Aug 13, 2009 at 04:35:11PM -0400, Masami Hiramatsu wrote: > Add kprobes-based event tracer on ftrace. > > This tracer is similar to the events tracer which is based on Tracepoint > infrastructure. Instead of Tracepoint, this tracer is based on kprobes > (kprobe and kretprobe). It probes anywhere where kprobes can probe(this > means, all functions body except for __kprobes functions). > > Similar to the events tracer, this tracer doesn't need to be activated via > current_tracer, instead of that, just set probe points via > /sys/kernel/debug/tracing/kprobe_events. And you can set filters on each > probe events via /sys/kernel/debug/tracing/events/kprobes/<EVENT>/filter. > > This tracer supports following probe arguments for each probe. > > %REG : Fetch register REG > sN : Fetch Nth entry of stack (N >= 0) > sa : Fetch stack address. > @ADDR : Fetch memory at ADDR (ADDR should be in kernel) > @SYM[+|-offs] : Fetch memory at SYM +|- offs (SYM should be a data symbol) > aN : Fetch function argument. (N >= 0) > rv : Fetch return value. > ra : Fetch return address. > +|-offs(FETCHARG) : fetch memory at FETCHARG +|- offs address. > > See Documentation/trace/kprobetrace.txt for details. > > Changes from v13: > - Support 'sa' for stack address. > - Use call->data instead of container_of() macro. > > Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> > Acked-by: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx> > Cc: Avi Kivity <avi@xxxxxxxxxx> > Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> > Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx> > Cc: Frank Ch. Eigler <fche@xxxxxxxxxx> > Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> > Cc: H. Peter Anvin <hpa@xxxxxxxxx> > Cc: Ingo Molnar <mingo@xxxxxxx> > Cc: Jason Baron <jbaron@xxxxxxxxxx> > Cc: Jim Keniston <jkenisto@xxxxxxxxxx> > Cc: K.Prasad <prasad@xxxxxxxxxxxxxxxxxx> > Cc: Lai Jiangshan <laijs@xxxxxxxxxxxxxx> > Cc: Li Zefan <lizf@xxxxxxxxxxxxxx> > Cc: Przemysław Pawełczyk <przemyslaw@xxxxxxxxxxxx> > Cc: Roland McGrath <roland@xxxxxxxxxx> > Cc: Sam Ravnborg <sam@xxxxxxxxxxxx> > Cc: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx> > Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> > Cc: Tom Zanussi <tzanussi@xxxxxxxxx> > Cc: Vegard Nossum <vegard.nossum@xxxxxxxxx> > --- > > Documentation/trace/kprobetrace.txt | 139 ++++ I'll probably split this commit to have the first version of the documentation as a separate patch in order to lighten this. Frederic. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
