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From: Frederic W. <fwe...@gm...> - 2009-08-19 01:23:23
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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 <mhi...@re...> > Acked-by: Ananth N Mavinakayanahalli <an...@in...> > Cc: Avi Kivity <av...@re...> > Cc: Andi Kleen <ak...@li...> > Cc: Christoph Hellwig <hc...@in...> > Cc: Frank Ch. Eigler <fc...@re...> > Cc: Frederic Weisbecker <fwe...@gm...> > Cc: H. Peter Anvin <hp...@zy...> > Cc: Ingo Molnar <mi...@el...> > Cc: Jason Baron <jb...@re...> > Cc: Jim Keniston <jke...@us...> > Cc: K.Prasad <pr...@li...> > Cc: Lai Jiangshan <la...@cn...> > Cc: Li Zefan <li...@cn...> > Cc: Przemysław Pawełczyk <prz...@pa...> > Cc: Roland McGrath <ro...@re...> > Cc: Sam Ravnborg <sa...@ra...> > Cc: Srikar Dronamraju <sr...@li...> > Cc: Steven Rostedt <ro...@go...> > Cc: Tom Zanussi <tza...@gm...> > Cc: Vegard Nossum <veg...@gm...> > --- > > 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. |