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    Subject[PATCH 03/05] Linux Kernel Markers : powerpc optimization
    Date
    Linux Kernel Markers : powerpc optimization

    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.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@polymtl.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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      Last update: 2007-02-11 21:17    [W:0.021 / U:0.264 seconds]
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