1. 18 Nov, 2010 3 commits
    • Frederic Weisbecker's avatar
      tracing: New macro to set up initial event flags value · 1ed0c597
      Frederic Weisbecker authored
      
      
      This introduces the new TRACE_EVENT_FLAGS() macro in order
      to set up initial event flags value.
      
      This macro must simply follow the definition of a trace event
      and take the event name and the flag value as parameters:
      
      TRACE_EVENT(my_event, .....
      ....
      );
      
      TRACE_EVENT_FLAGS(my_event, 1)
      
      This will set up 1 as the initial my_event->flags value.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Li Zefan <lizf@cn.fujitsu.com>
      Cc: Jason Baron <jbaron@redhat.com>
      1ed0c597
    • Frederic Weisbecker's avatar
      tracing: New flag to allow non privileged users to use a trace event · 61c32659
      Frederic Weisbecker authored
      
      
      This adds a new trace event internal flag that allows them to be
      used in perf by non privileged users in case of task bound tracing.
      
      This is desired for syscalls tracepoint because they don't leak
      global system informations, like some other tracepoints.
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Li Zefan <lizf@cn.fujitsu.com>
      Cc: Jason Baron <jbaron@redhat.com>
      61c32659
    • Soeren Sandmann Pedersen's avatar
      x86: Eliminate bp argument from the stack tracing routines · 9c0729dc
      Soeren Sandmann Pedersen authored
      
      
      The various stack tracing routines take a 'bp' argument in which the
      caller is supposed to provide the base pointer to use, or 0 if doesn't
      have one. Since bp is garbage whenever CONFIG_FRAME_POINTER is not
      defined, this means all callers in principle should either always pass
      0, or be conditional on CONFIG_FRAME_POINTER.
      
      However, there are only really three use cases for stack tracing:
      
      (a) Trace the current task, including IRQ stack if any
      (b) Trace the current task, but skip IRQ stack
      (c) Trace some other task
      
      In all cases, if CONFIG_FRAME_POINTER is not defined, bp should just
      be 0.  If it _is_ defined, then
      
      - in case (a) bp should be gotten directly from the CPU's register, so
        the caller should pass NULL for regs,
      
      - in case (b) the caller should should pass the IRQ registers to
        dump_trace(),
      
      - in case (c) bp should be gotten from the top of the task's stack, so
        the caller should pass NULL for regs.
      
      Hence, the bp argument is not necessary because the combination of
      task and regs is sufficient to determine an appropriate value for bp.
      
      This patch introduces a new inline function stack_frame(task, regs)
      that computes the desired bp. This function is then called from the
      two versions of dump_stack().
      Signed-off-by: default avatarSoren Sandmann <ssp@redhat.com>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Arjan van de Ven <arjan@infradead.org>,
      Cc: Frederic Weisbecker <fweisbec@gmail.com>,
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>,
      LKML-Reference: <m3oc9rop28.fsf@dhcp-100-3-82.bos.redhat.com>>
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      9c0729dc
  2. 31 Oct, 2010 6 commits
  3. 30 Oct, 2010 31 commits