linux-kernel - [PATCH 22/29] locking, tsx: Add a trace point for elision skipping

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Date:	Fri, 22 Mar 2013 18:25:16 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	linux-kernel@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	x86@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 22/29] locking, tsx: Add a trace point for elision skipping

From: Andi Kleen <ak@...ux.intel.com>

For tuning the adaptive locking algorithms it's useful to trace adaptive
elision skipping. Add a trace point for this case.

Used in followon patches

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 include/trace/events/elision.h |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+), 0 deletions(-)
 create mode 100644 include/trace/events/elision.h

diff --git a/include/trace/events/elision.h b/include/trace/events/elision.h
new file mode 100644
index 0000000..5d16d02
--- /dev/null
+++ b/include/trace/events/elision.h
@@ -0,0 +1,31 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM elision
+
+#if !defined(_TRACE_ELISION_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_ELISION_H
+
+#include <linux/lockdep.h>
+#include <linux/tracepoint.h>
+
+#ifdef CONFIG_RTM_LOCKS
+
+TRACE_EVENT(elision_skip_start,
+	    TP_PROTO(void *lock, u32 status),
+	    TP_ARGS(lock, status),
+	    TP_STRUCT__entry(
+		__field(void *, lock)
+		__field(u32, status)
+	    ),
+	    TP_fast_assign(
+		__entry->lock = lock;
+		__entry->status = status;
+	    ),
+	    TP_printk("%p %x", __entry->lock, __entry->status)
+);
+
+#endif
+
+#endif
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
-- 
1.7.7.6

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