Messages in this thread Patch in this message | | | From | Mathieu Desnoyers <> | Subject | [PATCH 04/05] Linux Kernel Markers : i386 optimisation | Date | Thu, 11 Jan 2007 19:02:17 -0500 |
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Linux Kernel Markers : i386 optimisation
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
--- /dev/null +++ b/include/asm-i386/marker.h @@ -0,0 +1,54 @@ +/* + * 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. + */ + + +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 char *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" \ + ".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_no_resched(); \ + } \ + } while (0) + +/* Offset of the immediate value from the start of the movb instruction, in + * bytes. */ +#define MARK_ENABLE_IMMEDIATE_OFFSET 1 +#define MARK_POLYMORPHIC + +#endif - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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