linux/include/trace/events/nmi.h
Dave Hansen 0c4df02d73 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 <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>
2013-06-23 11:52:58 +02:00

38 lines
741 B
C

#undef TRACE_SYSTEM
#define TRACE_SYSTEM nmi
#if !defined(_TRACE_NMI_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_NMI_H
#include <linux/ktime.h>
#include <linux/tracepoint.h>
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 <trace/define_trace.h>