From: Mathieu Desnoyers <mathieu.desnoyers@polymtl•ca>
To: linux-kernel@vger•kernel.org, paulus@samba•org,
Andrew Morton <akpm@osdl•org>, Ingo Molnar <mingo@redhat•com>,
Greg Kroah-Hartman <gregkh@suse•de>,
Christoph Hellwig <hch@infradead•org>
Cc: "Martin J. Bligh" <mbligh@mbligh•org>,
linuxppc-dev@ozlabs•org, Douglas Niehaus <niehaus@eecs•ku.edu>,
ltt-dev@shafik•org, systemtap@sources•redhat.com,
Thomas Gleixner <tglx@linutronix•de>
Subject: [PATCH 4/4] Linux Kernel Markers : powerpc optimisation
Date: Wed, 20 Dec 2006 19:01:40 -0500 [thread overview]
Message-ID: <20061221000140.GE28643@Krystal> (raw)
In-Reply-To: <20061220235216.GA28643@Krystal>
This is the powerpc Linux Kernel Markers optimised version.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl•ca>
--- /dev/null
+++ b/include/asm-powerpc/marker.h
@@ -0,0 +1,58 @@
+/*
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. PowerPC architecture
+ * optimisations.
+ *
+ * (C) Copyright 2006 Mathieu Desnoyers <mathieu.desnoyers@polymtl•ca>
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include <asm/asm-compat.h>
+
+struct __mark_marker_c {
+ const char *name;
+ marker_probe_func **call;
+ const char *format;
+} __attribute__((packed));
+
+struct __mark_marker {
+ struct __mark_marker_c *cmark;
+ volatile short *enable;
+} __attribute__((packed));
+
+#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 } ; \
+ 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_no_resched(); \
+ } \
+ } 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_POLYMORPHIC
+
+#endif
OpenPGP public key: http://krystal.dyndns.org:8080/key/compudj.gpg
Key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
parent reply other threads:[~2006-12-21 0:59 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20061220235216.GA28643@Krystal>]
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