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s390/diag: add tracepoint for diagnose calls

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To be able to analyse problems in regard to hypervisor overhead
add a tracepoing for diagnose calls. It reports the number of
the diagnose issued, e.g.

            sshd-1385  [002] ....    42.701431: diagnose: nr=0x9c
          <idle>-0     [001] ..s.    43.587528: diagnose: nr=0x9c

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2015-08-21 16:05:32 +02:00
parent 1ec2772e0c
commit b5a6b71b19
6 changed files with 98 additions and 14 deletions
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4
arch/s390/kernel/smp.c
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@@ -377,11 +377,11 @@ int smp_vcpu_scheduled(int cpu)
void smp_yield_cpu(int cpu)
{
if (MACHINE_HAS_DIAG9C) {
diag_stat_inc(DIAG_STAT_X09C);
diag_stat_inc_norecursion(DIAG_STAT_X09C);
asm volatile("diag %0,0,0x9c"
: : "d" (pcpu_devices[cpu].address));
} else if (MACHINE_HAS_DIAG44) {
diag_stat_inc(DIAG_STAT_X044);
diag_stat_inc_norecursion(DIAG_STAT_X044);
asm volatile("diag 0,0,0x44");
}
}