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  1. 24 6月, 2008 1 次提交
    • A
      ftrace: freeze kprobe'd records · ecea656d
      由 Abhishek Sagar 提交于 
      Let records identified as being kprobe'd be marked as "frozen". The trouble
with records which have a kprobe installed on their mcount call-site is
that they don't get updated. So if such a function which is currently being
traced gets its tracing disabled due to a new filter rule (or because it
was added to the notrace list) then it won't be updated and continue being
traced. This patch allows scanning of all frozen records during tracing to
check if they should be traced.
Signed-off-by: NAbhishek Sagar <sagar.abhishek@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      ecea656d
  3. 12 6月, 2008 1 次提交
  5. 10 6月, 2008 1 次提交
  7. 02 6月, 2008 1 次提交
    • A
      ftrace: distinguish kretprobe'd functions in trace logs · 76094a2c
      由 Abhishek Sagar 提交于 
      Tracing functions via ftrace which have a kretprobe installed on them, can produce misleading output in their trace logs. E.g, consider the correct trace of the following sequence:

do_IRQ()
{
~
  irq_enter();
~
}

Trace log (sample):
<idle>-0     [00] 4154504455.781616: irq_enter <- do_IRQ

But if irq_enter() has a kretprobe installed on it, the return value stored on the stack at each invocation is modified to divert the return to a kprobe trampoline function called kretprobe_trampoline(). So with this the trace would (currently) look like:

<idle>-0     [00] 4154504455.781616: irq_enter <- kretprobe_trampoline

Now this is quite misleading to the end user, as it suggests something that didn't actually happen. So just to avoid such misinterpretations, the inlined patch aims to output such a log as:

<idle>-0     [00] 4154504455.781616: irq_enter <- [unknown/kretprobe'd]
Signed-off-by: NAbhishek Sagar <sagar.abhishek@gmail.com>
Acked-by: NSteven Rostedt <srostedt@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      76094a2c
  9. 27 5月, 2008 3 次提交
  11. 24 5月, 2008 33 次提交