From 0c4df02d739fed5ab081b330d67403206dd3967e Mon Sep 17 00:00:00 2001 From: Dave Hansen Date: Fri, 21 Jun 2013 08:51:38 -0700 Subject: x86: Add NMI duration tracepoints 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 Acked-by: Peter Zijlstra Cc: paulus@samba.org Cc: acme@ghostprotocols.net Cc: Dave Hansen Signed-off-by: Ingo Molnar --- include/trace/events/nmi.h | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 include/trace/events/nmi.h (limited to 'include/trace') diff --git a/include/trace/events/nmi.h b/include/trace/events/nmi.h new file mode 100644 index 00000000000..da3ee96b8d0 --- /dev/null +++ b/include/trace/events/nmi.h @@ -0,0 +1,37 @@ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM nmi + +#if !defined(_TRACE_NMI_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_NMI_H + +#include +#include + +TRACE_EVENT(nmi_handler, + + TP_PROTO(void *handler, s64 delta_ns, int handled), + + TP_ARGS(handler, delta_ns, handled), + + TP_STRUCT__entry( + __field( void *, handler ) + __field( s64, delta_ns) + __field( int, handled ) + ), + + TP_fast_assign( + __entry->handler = handler; + __entry->delta_ns = delta_ns; + __entry->handled = handled; + ), + + TP_printk("%ps() delta_ns: %lld handled: %d", + __entry->handler, + __entry->delta_ns, + __entry->handled) +); + +#endif /* _TRACE_NMI_H */ + +/* This part ust be outside protection */ +#include -- cgit v1.2.3-18-g5258