• Masami Hiramatsu's avatar
    tracing: Add kprobe-based event tracer · 413d37d1
    Masami Hiramatsu authored
    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 in the next patch for details.
    
    Changes from v13:
     - Support 'sa' for stack address.
     - Use call->data instead of container_of() macro.
    
    [fweisbec@gmail.com: Fixed conflict against latest tracing/core]
    Signed-off-by: default avatarMasami Hiramatsu <mhiramat@redhat.com>
    Acked-by: default avatarAnanth N Mavinakayanahalli <ananth@in.ibm.com>
    Cc: Avi Kivity <avi@redhat.com>
    Cc: Andi Kleen <ak@linux.intel.com>
    Cc: Christoph Hellwig <hch@infradead.org>
    Cc: Frank Ch. Eigler <fche@redhat.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Jason Baron <jbaron@redhat.com>
    Cc: Jim Keniston <jkenisto@us.ibm.com>
    Cc: K.Prasad <prasad@linux.vnet.ibm.com>
    Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
    Cc: Li Zefan <lizf@cn.fujitsu.com>
    Cc: Przemysław Pawełczyk <przemyslaw@pawelczyk.it>
    Cc: Roland McGrath <roland@redhat.com>
    Cc: Sam Ravnborg <sam@ravnborg.org>
    Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Cc: Tom Zanussi <tzanussi@gmail.com>
    Cc: Vegard Nossum <vegard.nossum@gmail.com>
    LKML-Reference: <20090813203510.31965.29123.stgit@localhost.localdomain>
    Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
    413d37d1
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