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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0c4df02d73
This patch has been invaluable in my adventures finding issues in the perf NMI handler. I'm as big a fan of printk() as anybody is, but using printk() in NMIs is deadly when they're happening frequently. Even hacking in trace_printk() ended up eating enough CPU to throw off some of the measurements I was making. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: paulus@samba.org Cc: acme@ghostprotocols.net Cc: Dave Hansen <dave@sr71.net> Signed-off-by: Ingo Molnar <mingo@kernel.org>
38 lines
741 B
C
38 lines
741 B
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM nmi
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#if !defined(_TRACE_NMI_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_NMI_H
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#include <linux/ktime.h>
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#include <linux/tracepoint.h>
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TRACE_EVENT(nmi_handler,
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TP_PROTO(void *handler, s64 delta_ns, int handled),
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TP_ARGS(handler, delta_ns, handled),
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TP_STRUCT__entry(
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__field( void *, handler )
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__field( s64, delta_ns)
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__field( int, handled )
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),
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TP_fast_assign(
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__entry->handler = handler;
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__entry->delta_ns = delta_ns;
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__entry->handled = handled;
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),
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TP_printk("%ps() delta_ns: %lld handled: %d",
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__entry->handler,
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__entry->delta_ns,
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__entry->handled)
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);
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#endif /* _TRACE_NMI_H */
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/* This part ust be outside protection */
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#include <trace/define_trace.h>
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