[perfmon2] stoping/resuming counting

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Hi Stephane,

Forgive me if I understood wrongly but if I run the
example_v2.x/notify_self example on

my suse11 Nehalem system I get this:

./notify_self

[FIXED_CTRL(pmc16)=0xaa pmi0=1 en0=0x2 any0=0 pmi1=1 en1=0x2 any1=0
pmi2=1 en2=0x0 any2=0] INSTRUCTIONS_RETIRED UNHALTED_CORE_CYCLES

[FIXED_CTR0(pmd16)]

[FIXED_CTR1(pmd17)]

Notification 1: 1497911503 INSTRUCTIONS_RETIRED ip=0x4015a0

Notification 2: 1497711364 INSTRUCTIONS_RETIRED ip=0x4015a0

Notification 3: 1497964013 INSTRUCTIONS_RETIRED ip=0x4015a0

Now if instead of:

       pfm_self_start(ctx_fd);

        busyloop();

       pfm_self_stop(ctx_fd);

I run

        pfm_self_start(ctx_fd);

        busyloop();

        pfm_self_stop(ctx_fd);

        printf("Run with counting stopped\n");

        busyloop();

        printf("Run again with counting started\n");

        pfm_self_start(ctx_fd);

        busyloop();

        pfm_self_stop(ctx_fd);

I get:

./notify_self

[FIXED_CTRL(pmc16)=0xaa pmi0=1 en0=0x2 any0=0 pmi1=1 en1=0x2 any1=0
pmi2=1 en2=0x0 any2=0] INSTRUCTIONS_RETIRED UNHALTED_CORE_CYCLES

[FIXED_CTR0(pmd16)]

[FIXED_CTR1(pmd17)]

Notification 1: 1498758725 INSTRUCTIONS_RETIRED ip=0x4015e7

Notification 2: 1499513234 INSTRUCTIONS_RETIRED ip=0x4015e7

Notification 3: 1499545827 INSTRUCTIONS_RETIRED ip=0x4015e0

Run with counting stopped

Run again with counting started

 I was expecting to get another set of notifications after:

"Run again with counting started"

so either:

            -This is not the right way stop/resume counting. If so
please let me know what to do

            -There is something wrong in the perfmon behavior on this
system

Thanks,

Daniel Thomas.