Rapidly running systemtap causing hangs or oops

[Josh Stone]

On 06/23/2011 12:51 AM, Richard W.M. Jones wrote:
> Unfortunately for the real program I'm writing, I really do need a way
> to box stap around each test.  The problem I was having before was
> that there was quite a long delay between my test running and stap
> probes firing (or at least, seeing stap output).  I need the stap
> output from one test to be clearly distinct from the stap output from
> the next test.  If there was a way to run the test and then say to
> stap "now flush all your output" before running the next test, then
> that would be acceptable.
> 
> I thought about using the process ID, but ideally my tests will all
> run as the same pid.

How about marking it with some other event that always and only happens
at the beginning or end of your test loop?  e.g. take a mount:

  probe syscall.mount {
    printf("Starting to mount %s on %s\n", source, target)
  }


Josh