linux-kernel - [PATCH 03/05] Linux Kernel Markers : powerpc optimization

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Date:	Sun, 11 Feb 2007 15:03:25 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Christoph Hellwig <hch@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, systemtap@...rces.redhat.com,
	ltt-dev@...fik.org
Subject: [PATCH 03/05] Linux Kernel Markers : powerpc optimization

Linux Kernel Markers : powerpc optimization

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>

--- /dev/null
+++ b/include/asm-powerpc/marker.h
@@ -0,0 +1,49 @@
+/*
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. PowerPC architecture
+ * optimisations.
+ *
+ * (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include <asm/asm-compat.h>
+
+#ifdef CONFIG_MARKERS
+
+#define MARK(name, format, args...) \
+	do { \
+		static marker_probe_func *__mark_call_##name = \
+					__mark_empty_function; \
+		static const struct __mark_marker_c __mark_c_##name \
+			__attribute__((section(".markers.c"))) = \
+			{ #name, &__mark_call_##name, format, \
+			MARKER_OPTIMIZED } ; \
+		char condition; \
+		asm volatile(	".section .markers, \"a\";\n\t" \
+					PPC_LONG "%1, 0f;\n\t" \
+					".previous;\n\t" \
+					".align 4\n\t" \
+					"0:\n\t" \
+					"li %0,0;\n\t" \
+				: "=r" (condition) \
+				: "i" (&__mark_c_##name)); \
+		__mark_check_format(format, ## args); \
+		if (unlikely(condition)) { \
+			preempt_disable(); \
+			(*__mark_call_##name)(format, ## args); \
+			preempt_enable(); \
+		} \
+	} while (0)
+
+
+/* Offset of the immediate value from the start of the addi instruction (result
+ * of the li mnemonic), in bytes. */
+#define MARK_ENABLE_IMMEDIATE_OFFSET 2
+#define MARK_ENABLE_TYPE short
+#define MARK_POLYMORPHIC
+
+#endif
-
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