* + linux-kernel-markers-i386-optimization.patch added to -mm tree
@ 2007-02-15 7:22 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2007-02-15 7:22 UTC (permalink / raw)
To: mm-commits; +Cc: mathieu.desnoyers, ak
The patch titled
Linux Kernel Markers: i386 optimization
has been added to the -mm tree. Its filename is
linux-kernel-markers-i386-optimization.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Linux Kernel Markers: i386 optimization
From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
arch/i386/kernel/Makefile | 1
arch/i386/kernel/marker.c | 93 ++++++++++++++++++++++++++++++++++++
include/asm-i386/marker.h | 47 ++++++++++++++++++
3 files changed, 141 insertions(+)
diff -puN arch/i386/kernel/Makefile~linux-kernel-markers-i386-optimization arch/i386/kernel/Makefile
--- a/arch/i386/kernel/Makefile~linux-kernel-markers-i386-optimization
+++ a/arch/i386/kernel/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_VM86) += vm86.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_HPET_TIMER) += hpet.o
obj-$(CONFIG_K8_NB) += k8.o
+obj-$(CONFIG_MARKERS_ENABLE_OPTIMIZATION) += marker.o
obj-$(CONFIG_VMI) += vmi.o vmitime.o
obj-$(CONFIG_PARAVIRT) += paravirt.o
diff -puN /dev/null arch/i386/kernel/marker.c
--- /dev/null
+++ a/arch/i386/kernel/marker.c
@@ -0,0 +1,93 @@
+/* marker.c
+ *
+ * Erratum 49 fix for Intel PIII and higher.
+ *
+ * Permits marker activation by XMC with correct serialization.
+ *
+ * Reentrant for NMI and trap handler instrumentation. :-)
+ *
+ * Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ */
+
+#include <linux/notifier.h>
+#include <linux/mutex.h>
+#include <linux/preempt.h>
+#include <linux/smp.h>
+#include <linux/notifier.h>
+#include <linux/module.h>
+#include <asm/cacheflush.h>
+#include <asm/kdebug.h>
+
+#define BREAKPOINT_INSTRUCTION 0xcc
+#define BREAKPOINT_INS_LEN 1
+
+static DEFINE_MUTEX(mark_mutex);
+static long target_eip = 0;
+
+static void mark_synchronize_core(void *info)
+{
+ sync_core(); /* use cpuid to stop speculative execution */
+}
+
+/* We simply skip the 2 bytes load immediate here, leaving the register in an
+ * undefined state. We don't care about the content (0 or !0), because we are
+ * changing the value 0->1 or 1->0. This small window of undefined value
+ * doesn't matter.
+ */
+static int mark_notifier(struct notifier_block *nb,
+ unsigned long val, void *data)
+{
+ enum die_val die_val = (enum die_val) val;
+ struct die_args *args = (struct die_args *)data;
+
+ if (!args->regs || user_mode_vm(args->regs))
+ return NOTIFY_DONE;
+
+ if (die_val == DIE_INT3 && args->regs->eip == target_eip) {
+ args->regs->eip += 1; /* Skip the next byte of load immediate */
+ return NOTIFY_STOP;
+ }
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block mark_notify = {
+ .notifier_call = mark_notifier,
+ .priority = 0x7fffffff, /* we need to be notified first */
+};
+
+int arch_marker_set_ins_enable(void *address, char enable)
+{
+ char saved_byte;
+ int ret;
+ char *dest = address;
+
+ mutex_lock(&mark_mutex);
+ BUG_ON(!(enable ^ dest[1])); /* Must be a state change 0<->1 */
+ target_eip = (long)address + BREAKPOINT_INS_LEN;
+ /* register_die_notifier has memory barriers */
+ register_die_notifier(&mark_notify);
+ saved_byte = *dest;
+ *dest = BREAKPOINT_INSTRUCTION;
+ wmb();
+ /* Execute serializing instruction on each CPU.
+ * Acts as a memory barrier. */
+ ret = on_each_cpu(mark_synchronize_core, NULL, 1, 1);
+ BUG_ON(ret != 0);
+
+ dest[1] = enable;
+ wmb();
+ *dest = saved_byte;
+ /* Wait for all int3 handlers to end
+ (interrupts are disabled in int3).
+ This CPU is clearly not in a int3 handler
+ (not preemptible).
+ synchronize_sched has memory barriers */
+ synchronize_sched();
+ unregister_die_notifier(&mark_notify);
+ /* unregister_die_notifier has memory barriers */
+ target_eip = 0;
+ mutex_unlock(&mark_mutex);
+ flush_icache_range(address, size);
+ return 0;
+}
+EXPORT_SYMBOL(arch_marker_set_ins_enable);
diff -puN /dev/null include/asm-i386/marker.h
--- /dev/null
+++ a/include/asm-i386/marker.h
@@ -0,0 +1,47 @@
+/*
+ * marker.h
+ *
+ * Code markup for dynamic and static tracing. i386 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.
+ */
+
+
+#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" \
+ ".long %1, 0f;\n\t" \
+ ".previous;\n\t" \
+ ".align 2\n\t" \
+ "0:\n\t" \
+ "movb $0,%0;\n\t" \
+ : "=r" (condition) \
+ : "m" (__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 movb instruction, in
+ * bytes. */
+#define MARK_ENABLE_IMMEDIATE_OFFSET 1
+#define MARK_ENABLE_TYPE char
+#define MARK_POLYMORPHIC
+
+extern int arch_marker_set_ins_enable(void *address, char enable);
+
+#endif
_
Patches currently in -mm which might be from mathieu.desnoyers@polymtl.ca are
origin.patch
git-mips.patch
atomich-add-atomic64-cmpxchg-xchg-and-add_unless-to-alpha.patch
atomich-complete-atomic_long-operations-in-asm-generic.patch
atomich-i386-type-safety-fix.patch
atomich-add-atomic64-cmpxchg-xchg-and-add_unless-to-ia64.patch
atomich-add-atomic64-cmpxchg-xchg-and-add_unless-to-mips.patch
atomich-add-atomic64-cmpxchg-xchg-and-add_unless-to-parisc.patch
atomich-add-atomic64-cmpxchg-xchg-and-add_unless-to-powerpc.patch
atomich-add-atomic64-cmpxchg-xchg-and-add_unless-to-sparc64.patch
atomich-add-atomic64_xchg-to-s390.patch
atomich-add-atomic64-cmpxchg-xchg-and-add_unless-to-x86_64.patch
atomich-atomic_add_unless-as-inline-remove-systemh-atomich-circular-dependency.patch
local_t-architecture-independant-extension.patch
local_t-alpha-extension.patch
local_t-i386-extension.patch
local_t-ia64-extension.patch
local_t-mips-extension.patch
local_t-parisc-cleanup.patch
local_t-powerpc-extension.patch
local_t-s390-cleanup.patch
local_t-sparc64-cleanup.patch
local_t-x86_64-extension.patch
linux-kernel-markers-kconfig-menus.patch
linux-kernel-markers-architecture-independant-code.patch
linux-kernel-markers-powerpc-optimization.patch
linux-kernel-markers-i386-optimization.patch
linux-kernel-markers-non-optimized-architectures.patch
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2007-02-15 7:22 + linux-kernel-markers-i386-optimization.patch added to -mm tree akpm
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