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s390/diag: add a statistic for diagnose calls

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Introduce /sys/debug/kernel/diag_stat with a statistic how many diagnose
calls have been done by each CPU in the system.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2015-08-20 17:28:44 +02:00
parent acdc9fc9a8
commit 1ec2772e0c
19 changed files with 282 additions and 19 deletions
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5
arch/s390/kernel/processor.c
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@@ -11,6 +11,7 @@
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/cpu.h>
#include <asm/diag.h>
#include <asm/elf.h>
#include <asm/lowcore.h>
#include <asm/param.h>
@@ -20,8 +21,10 @@ static DEFINE_PER_CPU(struct cpuid, cpu_id);
void notrace cpu_relax(void)
{
if (!smp_cpu_mtid && MACHINE_HAS_DIAG44)
if (!smp_cpu_mtid && MACHINE_HAS_DIAG44) {
diag_stat_inc(DIAG_STAT_X044);
asm volatile("diag 0,0,0x44");
}
barrier();
}
EXPORT_SYMBOL(cpu_relax);