b5a6b71b19
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>
30 lines
581 B
C
30 lines
581 B
C
/*
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* Tracepoint definitions for s390
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*
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* Copyright IBM Corp. 2015
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <linux/percpu.h>
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#define CREATE_TRACE_POINTS
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#include <asm/trace/diag.h>
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EXPORT_TRACEPOINT_SYMBOL(diagnose);
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static DEFINE_PER_CPU(unsigned int, diagnose_trace_depth);
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void trace_diagnose_norecursion(int diag_nr)
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{
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unsigned long flags;
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unsigned int *depth;
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local_irq_save(flags);
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depth = this_cpu_ptr(&diagnose_trace_depth);
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if (*depth == 0) {
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(*depth)++;
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trace_diagnose(diag_nr);
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(*depth)--;
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}
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local_irq_restore(flags);
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}
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