[perfmon2] pfm_start/pfm_stop needed for thread-based self-monitoring?

[Andrej van der Zee]

Hi,

I am using perfmon2 for thread-based self-monitoring. The thread
executes many requests and I want to monitor each request separately.
To make it little intrusive as possible, I am trying to minimize code
for re-initialization of the PMU for each request as much as possible.
For each request, I execute the following code now:

for (i=0; i < thd->mbrace_data.output_param.pfp_pmd_count; i++) {
    thd->mbrace_data.pmd[i].reg_value = 0;
  }

  if (pfm_write_pmds(thd->mbrace_data.context_fd, thd->mbrace_data.pmd,
        thd->mbrace_data.output_param.pfp_pmd_count)) {
    general_log_print(thd, COM_MBRACE, "mBrace: pfm_write_pmds error
errno %d", errno);
    return;
  }

  if (pfm_start(thd->mbrace_data.context_fd, NULL)) {
    general_log_print(thd, COM_MBRACE, "mBrace: pfm_start error errno
%d", errno);
    return;
  }


But I was wondering, for thread-based self-monitoring, do I really
need to call pfm_start and pfm_stop for every request? Or can I
read/write the PMU without stopping pfm?

Thank you,
Andrej

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