Please ignore the three "if(" -> "if (" coding style issues in this patch. I
will correct them in the next release.
Mathieu
* Mathieu Desnoyers ([email protected]) wrote:
> Hi,
>
> Constructing on Jeremy Fitzhardinge's comments about gcc optimizations, I
> rewrote (once more) the markers mechanism so that the optimized mode does not
> jump between two different inline asm. Instead, the optimized version uses a
> load immediate (in assembly) that will be used by a test to decide of a branch
> (in C).
>
> The generic, non optimized version, now does almost the same as the optimized
> version, but instead of using an immediate value, it uses a value in memory
> which must therefore be loaded before each test.
>
> On x86, the result of the fast path is now (the call is put far from the "hot"
> instructions at the end of the function) :
>
> ...
> 70: b0 00 mov $0x0,%al (load 0 in al)
> 72: 84 c0 test %al,%al
> 74: 75 57 jne cd <my_open+0x6f> (not taken)
> ....
>
> Compared to the generic version (the call is also put at the end of the
> function) :
> ...
> 64: 0f b6 05 07 00 00 00 movzbl 0x7,%eax (load eax from memory)
> 6b: 84 c0 test %al,%al
> 6d: 75 4a jne b9 <my_open+0x5b> (not taken)
> ...
>
> I also added the powerpc optimization (not tested yet though).
>
> Comments are welcome,
>
> Mathieu
>
> ---BEGIN---
> diff --git a/Makefile b/Makefile
> index 1700d3f..78ed30f 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -301,7 +301,8 @@ # Use LINUXINCLUDE when you must referen
> # Needed to be compatible with the O= option
> LINUXINCLUDE := -Iinclude \
> $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
> - -include include/linux/autoconf.h
> + -include include/linux/autoconf.h \
> + -include include/linux/marker.h
>
> CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
>
> diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
> index 213c785..95c1d1b 100644
> --- a/arch/alpha/Kconfig
> +++ b/arch/alpha/Kconfig
> @@ -630,6 +630,12 @@ source "fs/Kconfig"
>
> source "arch/alpha/oprofile/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/alpha/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 08b7cc9..4c03f09 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -871,6 +871,12 @@ source "fs/Kconfig"
>
> source "arch/arm/oprofile/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/arm/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/arm26/Kconfig b/arch/arm26/Kconfig
> index cf4ebf4..f34e157 100644
> --- a/arch/arm26/Kconfig
> +++ b/arch/arm26/Kconfig
> @@ -232,6 +232,12 @@ source "drivers/misc/Kconfig"
>
> source "drivers/usb/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/arm26/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
> index 856b665..84f8efd 100644
> --- a/arch/cris/Kconfig
> +++ b/arch/cris/Kconfig
> @@ -179,6 +179,12 @@ source "sound/Kconfig"
>
> source "drivers/usb/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/cris/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig
> index 95a3892..8708a75 100644
> --- a/arch/frv/Kconfig
> +++ b/arch/frv/Kconfig
> @@ -345,6 +345,12 @@ source "drivers/Kconfig"
>
> source "fs/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/frv/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
> index cabf0bf..bdb67ed 100644
> --- a/arch/h8300/Kconfig
> +++ b/arch/h8300/Kconfig
> @@ -197,6 +197,12 @@ endmenu
>
> source "fs/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/h8300/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
> index 8dfa305..e6cc7da 100644
> --- a/arch/i386/Kconfig
> +++ b/arch/i386/Kconfig
> @@ -1081,6 +1081,9 @@ config KPROBES
> a probepoint and specifies the callback. Kprobes is useful
> for kernel debugging, non-intrusive instrumentation and testing.
> If in doubt, say "N".
> +
> +source "kernel/Kconfig.marker"
> +
> endmenu
>
> source "arch/i386/Kconfig.debug"
> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
> index 0f3076a..2342975 100644
> --- a/arch/ia64/Kconfig
> +++ b/arch/ia64/Kconfig
> @@ -499,6 +499,9 @@ config KPROBES
> a probepoint and specifies the callback. Kprobes is useful
> for kernel debugging, non-intrusive instrumentation and testing.
> If in doubt, say "N".
> +
> +source "kernel/Kconfig.marker"
> +
> endmenu
>
> source "arch/ia64/Kconfig.debug"
> diff --git a/arch/m32r/Kconfig b/arch/m32r/Kconfig
> index 41fd490..50f0a8e 100644
> --- a/arch/m32r/Kconfig
> +++ b/arch/m32r/Kconfig
> @@ -386,6 +386,12 @@ source "fs/Kconfig"
>
> source "arch/m32r/oprofile/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/m32r/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
> index 805b81f..5af9e00 100644
> --- a/arch/m68k/Kconfig
> +++ b/arch/m68k/Kconfig
> @@ -652,6 +652,12 @@ endmenu
>
> source "fs/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/m68k/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
> index 3cde682..bd01cc0 100644
> --- a/arch/m68knommu/Kconfig
> +++ b/arch/m68knommu/Kconfig
> @@ -652,6 +652,12 @@ source "drivers/Kconfig"
>
> source "fs/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/m68knommu/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index e8ff09f..4d5dbf9 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -1850,6 +1850,12 @@ source "fs/Kconfig"
>
> source "arch/mips/oprofile/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/mips/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
> index 910fb3a..a0a7dd7 100644
> --- a/arch/parisc/Kconfig
> +++ b/arch/parisc/Kconfig
> @@ -251,6 +251,12 @@ source "fs/Kconfig"
>
> source "arch/parisc/oprofile/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/parisc/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 6729c98..44f25b5 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -1011,6 +1011,9 @@ config KPROBES
> a probepoint and specifies the callback. Kprobes is useful
> for kernel debugging, non-intrusive instrumentation and testing.
> If in doubt, say "N".
> +
> +source "kernel/Kconfig.marker"
> +
> endmenu
>
> source "arch/powerpc/Kconfig.debug"
> diff --git a/arch/ppc/Kconfig b/arch/ppc/Kconfig
> index e9a8f5d..ca871ab 100644
> --- a/arch/ppc/Kconfig
> +++ b/arch/ppc/Kconfig
> @@ -1412,6 +1412,12 @@ source "lib/Kconfig"
>
> source "arch/powerpc/oprofile/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/ppc/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
> index 01c5c08..57600b5 100644
> --- a/arch/s390/Kconfig
> +++ b/arch/s390/Kconfig
> @@ -476,6 +476,12 @@ source "fs/Kconfig"
>
> source "arch/s390/oprofile/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/s390/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
> index 2bcecf4..0fd24d3 100644
> --- a/arch/sh/Kconfig
> +++ b/arch/sh/Kconfig
> @@ -644,6 +644,12 @@ source "fs/Kconfig"
>
> source "arch/sh/oprofile/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/sh/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/sh64/Kconfig b/arch/sh64/Kconfig
> index 58c678e..f4ecb4d 100644
> --- a/arch/sh64/Kconfig
> +++ b/arch/sh64/Kconfig
> @@ -276,6 +276,12 @@ source "fs/Kconfig"
>
> source "arch/sh64/oprofile/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/sh64/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> index 9431e96..de02311 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -289,6 +289,12 @@ endmenu
>
> source "fs/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/sparc/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
> index 43a66f5..971f5e2 100644
> --- a/arch/sparc64/Kconfig
> +++ b/arch/sparc64/Kconfig
> @@ -419,6 +419,9 @@ config KPROBES
> a probepoint and specifies the callback. Kprobes is useful
> for kernel debugging, non-intrusive instrumentation and testing.
> If in doubt, say "N".
> +
> +source "kernel/Kconfig.marker"
> +
> endmenu
>
> source "arch/sparc64/Kconfig.debug"
> diff --git a/arch/um/Kconfig b/arch/um/Kconfig
> index 76e85bb..9481883 100644
> --- a/arch/um/Kconfig
> +++ b/arch/um/Kconfig
> @@ -312,4 +312,10 @@ config INPUT
> bool
> default n
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/um/Kconfig.debug"
> diff --git a/arch/v850/Kconfig b/arch/v850/Kconfig
> index 37ec644..6ce651f 100644
> --- a/arch/v850/Kconfig
> +++ b/arch/v850/Kconfig
> @@ -324,6 +324,12 @@ source "sound/Kconfig"
>
> source "drivers/usb/Kconfig"
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/v850/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
> index 408d44a..6feb011 100644
> --- a/arch/x86_64/Kconfig
> +++ b/arch/x86_64/Kconfig
> @@ -611,6 +611,9 @@ config KPROBES
> a probepoint and specifies the callback. Kprobes is useful
> for kernel debugging, non-intrusive instrumentation and testing.
> If in doubt, say "N".
> +
> +source "kernel/Kconfig.marker"
> +
> endmenu
>
> source "arch/x86_64/Kconfig.debug"
> diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
> index dbeb350..413abb8 100644
> --- a/arch/xtensa/Kconfig
> +++ b/arch/xtensa/Kconfig
> @@ -255,6 +255,12 @@ config EMBEDDED_RAMDISK_IMAGE
> provide one yourself.
> endmenu
>
> +menu "Instrumentation Support"
> +
> +source "kernel/Kconfig.marker"
> +
> +endmenu
> +
> source "arch/xtensa/Kconfig.debug"
>
> source "security/Kconfig"
> diff --git a/include/asm-alpha/marker.h b/include/asm-alpha/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-alpha/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-arm/marker.h b/include/asm-arm/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-arm/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-arm26/marker.h b/include/asm-arm26/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-arm26/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-cris/marker.h b/include/asm-cris/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-cris/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-frv/marker.h b/include/asm-frv/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-frv/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-generic/marker.h b/include/asm-generic/marker.h
> new file mode 100644
> index 0000000..4dd08fa
> --- /dev/null
> +++ b/include/asm-generic/marker.h
> @@ -0,0 +1,42 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Generic header.
> + *
> + * 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; \
> + volatile static char __marker_enable_##name = 0; \
> + asm volatile( ".section .markers, \"a\";\n\t" \
> + ".long %0, %1, %2, %3;\n\t" \
> + ".previous;\n\t" \
> + : : \
> + "m" (*(#name)), \
> + "m" (__marker_enable_##name), \
> + "m" (__mark_call_##name), \
> + "m" (*format)); \
> + if(unlikely(__marker_enable_##name)) { \
> + preempt_disable(); \
> + (*__mark_call_##name)(format, ## args); \
> + preempt_enable_no_resched(); \
> + } \
> + } while(0)
> +
> +
> +#define MARK_ENABLE_IMMEDIATE_OFFSET 0
> +
> +struct __mark_marker {
> + const char *name;
> + char *enable;
> + marker_probe_func **call;
> + const char *format;
> +} __attribute__((packed));
> +
> +#endif
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index 9d11550..d029043 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -90,6 +90,12 @@ #define RODATA \
> __ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
> *(__ksymtab_strings) \
> } \
> + /* Kernel markers : pointers */ \
> + .markers : AT(ADDR(.markers) - LOAD_OFFSET) { \
> + VMLINUX_SYMBOL(__start___markers) = .; \
> + *(.markers) \
> + VMLINUX_SYMBOL(__stop___markers) = .; \
> + } \
> __end_rodata = .; \
> . = ALIGN(4096); \
> \
> diff --git a/include/asm-h8300/marker.h b/include/asm-h8300/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-h8300/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-i386/marker.h b/include/asm-i386/marker.h
> new file mode 100644
> index 0000000..bb88767
> --- /dev/null
> +++ b/include/asm-i386/marker.h
> @@ -0,0 +1,48 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. i386 architecture optimisations.
> + *
> + * (C) Copyright 2006 Mathieu Desnoyers <[email protected]>
> + *
> + * 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; \
> + char condition; \
> + asm volatile( ".section .markers, \"a\";\n\t" \
> + ".long %1, 0f, %2, %3;\n\t" \
> + ".previous;\n\t" \
> + ".align 16;\n\t" \
> + "0:\n\t" \
> + "movb $0,%0;\n\t" \
> + : "=r" (condition) : \
> + "m" (*(#name)), \
> + "m" (__mark_call_##name), \
> + "m" (*format)); \
> + __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
> +
> +struct __mark_marker {
> + const char *name;
> + char *enable;
> + marker_probe_func **call;
> + const char *format;
> +} __attribute__((packed));
> +
> +#endif
> diff --git a/include/asm-ia64/marker.h b/include/asm-ia64/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-ia64/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-m32r/marker.h b/include/asm-m32r/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-m32r/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-m68k/marker.h b/include/asm-m68k/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-m68k/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-m68knommu/marker.h b/include/asm-m68knommu/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-m68knommu/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-mips/marker.h b/include/asm-mips/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-mips/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-parisc/marker.h b/include/asm-parisc/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-parisc/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-powerpc/marker.h b/include/asm-powerpc/marker.h
> new file mode 100644
> index 0000000..2c76cbe
> --- /dev/null
> +++ b/include/asm-powerpc/marker.h
> @@ -0,0 +1,50 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. PowerPC architecture
> + * optimisations.
> + *
> + * (C) Copyright 2006 Mathieu Desnoyers <[email protected]>
> + *
> + * 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; \
> + char condition; \
> + asm volatile( ".section .markers, \"a\";\n\t" \
> + ".long %1, 0f, %2, %3;\n\t" \
> + ".previous;\n\t" \
> + ".align 32;\n\t" \
> + "0:\n\t" \
> + "li $0,%0;\n\t" \
> + : "=r" (condition) : \
> + "m" (*(#name)), \
> + "m" (__mark_call_##name), \
> + "m" (*format)); \
> + __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
> +
> +struct __mark_marker {
> + const char *name;
> + short *enable;
> + marker_probe_func **call;
> + const char *format;
> +} __attribute__((packed));
> +
> +#endif
> diff --git a/include/asm-ppc/marker.h b/include/asm-ppc/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-ppc/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-ppc64/marker.h b/include/asm-ppc64/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-ppc64/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-s390/marker.h b/include/asm-s390/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-s390/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-sh/marker.h b/include/asm-sh/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-sh/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-sh64/marker.h b/include/asm-sh64/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-sh64/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-sparc/marker.h b/include/asm-sparc/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-sparc/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-sparc64/marker.h b/include/asm-sparc64/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-sparc64/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-um/marker.h b/include/asm-um/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-um/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-v850/marker.h b/include/asm-v850/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-v850/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-x86_64/marker.h b/include/asm-x86_64/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-x86_64/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/asm-xtensa/marker.h b/include/asm-xtensa/marker.h
> new file mode 100644
> index 0000000..8d9467f
> --- /dev/null
> +++ b/include/asm-xtensa/marker.h
> @@ -0,0 +1,13 @@
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing. Architecture specific
> + * optimisations.
> + *
> + * No optimisation implemented.
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#include <asm-generic/marker.h>
> diff --git a/include/linux/marker.h b/include/linux/marker.h
> new file mode 100644
> index 0000000..71909f0
> --- /dev/null
> +++ b/include/linux/marker.h
> @@ -0,0 +1,65 @@
> +#ifndef _LINUX_MARKER_H
> +#define _LINUX_MARKER_H
> +
> +/*
> + * marker.h
> + *
> + * Code markup for dynamic and static tracing.
> + *
> + * Example :
> + *
> + * MARK(subsystem_event, "%d %s", someint, somestring);
> + * Where :
> + * - Subsystem is the name of your subsystem.
> + * - event is the name of the event to mark.
> + * - "%d %s" is the formatted string for printk.
> + * - someint is an integer.
> + * - somestring is a char *.
> + *
> + * - Dynamically overridable function call based on marker mechanism
> + * from Frank Ch. Eigler <[email protected]>.
> + * - Thanks to Jeremy Fitzhardinge <[email protected]> for his constructive
> + * criticism about gcc optimization related issues.
> + *
> + * The marker mechanism supports multiple instances of the same marker.
> + * Markers can be put in inline functions, inlined static functions and
> + * unrolled loops.
> + *
> + * (C) Copyright 2006 Mathieu Desnoyers <[email protected]>
> + *
> + * This file is released under the GPLv2.
> + * See the file COPYING for more details.
> + */
> +
> +#ifndef __ASSEMBLY__
> +
> +typedef void marker_probe_func(const char *fmt, ...);
> +
> +#ifndef CONFIG_MARKERS_DISABLE_OPTIMIZATION
> +#include <asm/marker.h>
> +#else
> +#include <asm-generic/marker.h>
> +#endif
> +
> +#define MARK_NOARGS " "
> +#define MARK_MAX_FORMAT_LEN 1024
> +
> +#ifndef CONFIG_MARKERS
> +#define MARK(name, format, args...) \
> + __mark_check_format(format, ## args)
> +#endif
> +
> +static inline __attribute__ ((format (printf, 1, 2)))
> +void __mark_check_format(const char *fmt, ...)
> +{ }
> +
> +extern marker_probe_func __mark_empty_function;
> +
> +extern int marker_set_probe(const char *name, const char *format,
> + marker_probe_func *probe);
> +
> +extern int marker_remove_probe(marker_probe_func *probe);
> +extern int marker_list_probe(marker_probe_func *probe);
> +
> +#endif
> +#endif
> diff --git a/include/linux/module.h b/include/linux/module.h
> index eaec13d..5689857 100644
> --- a/include/linux/module.h
> +++ b/include/linux/module.h
> @@ -254,6 +254,8 @@ struct module
> const struct kernel_symbol *syms;
> unsigned int num_syms;
> const unsigned long *crcs;
> + const struct __mark_marker *markers;
> + unsigned int num_markers;
>
> /* GPL-only exported symbols. */
> const struct kernel_symbol *gpl_syms;
> diff --git a/kernel/Kconfig.marker b/kernel/Kconfig.marker
> new file mode 100644
> index 0000000..448e2db
> --- /dev/null
> +++ b/kernel/Kconfig.marker
> @@ -0,0 +1,17 @@
> +# Code markers configuration
> +
> +config MARKERS
> + bool "Activate markers"
> + select MODULES
> + default n
> + help
> + Place an empty function call at each marker site. Can by
> + dynamically changed for a probe function.
> +
> +config MARKERS_DISABLE_OPTIMIZATION
> + bool "Disable architecture specific marker optimization"
> + depends EMBEDDED
> + default n
> + help
> + Disable code replacement jump optimisations. Especially useful if your
> + code is in a read-only rom/flash.
> diff --git a/kernel/module.c b/kernel/module.c
> index bbe0486..e451527 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -123,6 +123,8 @@ extern const struct kernel_symbol __stop
> extern const unsigned long __start___kcrctab[];
> extern const unsigned long __start___kcrctab_gpl[];
> extern const unsigned long __start___kcrctab_gpl_future[];
> +extern const struct __mark_marker __start___markers[];
> +extern const struct __mark_marker __stop___markers[];
>
> #ifndef CONFIG_MODVERSIONS
> #define symversion(base, idx) NULL
> @@ -236,6 +238,164 @@ static struct module *find_module(const
> return NULL;
> }
>
> +#ifdef CONFIG_MARKERS
> +void __mark_empty_function(const char *fmt, ...)
> +{
> +}
> +EXPORT_SYMBOL(__mark_empty_function);
> +
> +#define MARK_ENABLE_OFFSET(a) \
> + (typeof(a))((char*)a+MARK_ENABLE_IMMEDIATE_OFFSET)
> +
> +static int marker_set_probe_range(const char *name,
> + const char *format,
> + marker_probe_func *probe,
> + const struct __mark_marker *begin,
> + const struct __mark_marker *end)
> +{
> + const struct __mark_marker *iter;
> + int found = 0;
> +
> + for(iter = begin; iter < end; iter++) {
> + if (strcmp(name, iter->name) == 0) {
> + if (format && strcmp(format, iter->format) != 0) {
> + printk(KERN_NOTICE
> + "Format mismatch for probe %s "
> + "(%s), marker (%s)\n",
> + name,
> + format,
> + iter->format);
> + continue;
> + }
> + if (probe == __mark_empty_function) {
> + if (*iter->call != __mark_empty_function) {
> + found++;
> + *MARK_ENABLE_OFFSET(iter->enable) = 0;
> + *iter->call = __mark_empty_function;
> + }
> + } else {
> + if (*iter->call != __mark_empty_function) {
> + if (*iter->call != probe) {
> + printk(KERN_NOTICE
> + "Marker %s busy, "
> + "probe %p already "
> + "installed\n",
> + name,
> + *iter->call);
> + continue;
> + }
> + } else {
> + found++;
> + *iter->call = probe;
> + *MARK_ENABLE_OFFSET(iter->enable) = 1;
> + }
> + }
> + }
> + }
> + return found;
> +}
> +
> +static int marker_remove_probe_range(marker_probe_func *probe,
> + const struct __mark_marker *begin,
> + const struct __mark_marker *end)
> +{
> + const struct __mark_marker *iter;
> + int found = 0;
> +
> + for(iter = begin; iter < end; iter++) {
> + if (*iter->call == probe) {
> + *MARK_ENABLE_OFFSET(iter->enable) = 0;
> + *iter->call = __mark_empty_function;
> + found++;
> + }
> + }
> + return found;
> +}
> +
> +static int marker_list_probe_range(marker_probe_func *probe,
> + const struct __mark_marker *begin,
> + const struct __mark_marker *end)
> +{
> + const struct __mark_marker *iter;
> + int found = 0;
> +
> + for(iter = begin; iter < end; iter++) {
> + if (probe)
> + if (probe != *iter->call) continue;
> + printk("name %s \n", iter->name);
> + printk(" enable %u ", *MARK_ENABLE_OFFSET(iter->enable));
> + printk(" func 0x%p format \"%s\"\n",
> + *iter->call, iter->format);
> + found++;
> + }
> + return found;
> +}
> +/* markers use the modlist_lock to to synchronise */
> +int marker_set_probe(const char *name, const char *format,
> + marker_probe_func *probe)
> +{
> + struct module *mod;
> + int found = 0;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&modlist_lock, flags);
> + /* Core kernel markers */
> + found += marker_set_probe_range(name, format, probe,
> + __start___markers, __stop___markers);
> + /* Markers in modules. */
> + list_for_each_entry(mod, &modules, list) {
> + found += marker_set_probe_range(name, format, probe,
> + mod->markers, mod->markers+mod->num_markers);
> + }
> + spin_unlock_irqrestore(&modlist_lock, flags);
> + return found;
> +}
> +EXPORT_SYMBOL(marker_set_probe);
> +
> +int marker_remove_probe(marker_probe_func *probe)
> +{
> + struct module *mod;
> + int found = 0;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&modlist_lock, flags);
> + /* Core kernel markers */
> + found += marker_remove_probe_range(probe,
> + __start___markers, __stop___markers);
> + /* Markers in modules. */
> + list_for_each_entry(mod, &modules, list) {
> + found += marker_remove_probe_range(probe,
> + mod->markers, mod->markers+mod->num_markers);
> + }
> + spin_unlock_irqrestore(&modlist_lock, flags);
> + return found;
> +}
> +EXPORT_SYMBOL(marker_remove_probe);
> +
> +int marker_list_probe(marker_probe_func *probe)
> +{
> + struct module *mod;
> + int found = 0;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&modlist_lock, flags);
> + /* Core kernel markers */
> + printk("Listing kernel markers\n");
> + found += marker_list_probe_range(probe,
> + __start___markers, __stop___markers);
> + /* Markers in modules. */
> + printk("Listing module markers\n");
> + list_for_each_entry(mod, &modules, list) {
> + printk("Listing markers for module %s\n", mod->name);
> + found += marker_list_probe_range(probe,
> + mod->markers, mod->markers+mod->num_markers);
> + }
> + spin_unlock_irqrestore(&modlist_lock, flags);
> + return found;
> +}
> +EXPORT_SYMBOL(marker_list_probe);
> +#endif
> +
> #ifdef CONFIG_SMP
> /* Number of blocks used and allocated. */
> static unsigned int pcpu_num_used, pcpu_num_allocated;
> @@ -1412,7 +1572,7 @@ static struct module *load_module(void _
> unsigned int i, symindex = 0, strindex = 0, setupindex, exindex,
> exportindex, modindex, obsparmindex, infoindex, gplindex,
> crcindex, gplcrcindex, versindex, pcpuindex, gplfutureindex,
> - gplfuturecrcindex;
> + gplfuturecrcindex, markersindex;
> struct module *mod;
> long err = 0;
> void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
> @@ -1502,6 +1662,7 @@ #endif
> versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
> infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
> pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
> + markersindex = find_sec(hdr, sechdrs, secstrings, ".markers");
>
> /* Don't keep modinfo section */
> sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
> @@ -1510,6 +1671,11 @@ #ifdef CONFIG_KALLSYMS
> sechdrs[symindex].sh_flags |= SHF_ALLOC;
> sechdrs[strindex].sh_flags |= SHF_ALLOC;
> #endif
> +#ifdef CONFIG_MARKERS
> + sechdrs[markersindex].sh_flags |= SHF_ALLOC;
> +#else
> + sechdrs[markersindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
> +#endif
>
> /* Check module struct version now, before we try to use module. */
> if (!check_modstruct_version(sechdrs, versindex, mod)) {
> @@ -1642,6 +1808,11 @@ #endif
> mod->gpl_future_syms = (void *)sechdrs[gplfutureindex].sh_addr;
> if (gplfuturecrcindex)
> mod->gpl_future_crcs = (void *)sechdrs[gplfuturecrcindex].sh_addr;
> + if (markersindex) {
> + mod->markers = (void *)sechdrs[markersindex].sh_addr;
> + mod->num_markers =
> + sechdrs[markersindex].sh_size / sizeof(*mod->markers);
> + }
>
> #ifdef CONFIG_MODVERSIONS
> if ((mod->num_syms && !crcindex) ||
> ---END---
>
> ---BEGIN---
>
> /* probe.c
> *
> * Loads a function at a marker call site.
> *
> * (C) Copyright 2006 Mathieu Desnoyers <[email protected]>
> *
> * This file is released under the GPLv2.
> * See the file COPYING for more details.
> */
>
> #include <linux/marker.h>
> #include <linux/module.h>
> #include <linux/kallsyms.h>
>
> /* function to install */
> #define DO_MARK1_FORMAT "%d"
> void do_mark1(const char *format, ...)
> {
> va_list ap;
> int value;
>
> va_start(ap, format);
> value = va_arg(ap, int);
> printk("value is %d\n", value);
>
> va_end(ap);
> }
>
> void do_mark2(const char *format, ...)
> {
> va_list ap;
>
> va_start(ap, format);
> vprintk(format, ap);
> va_end(ap);
> printk("\n");
> }
>
> #define DO_MARK3_FORMAT "%d %s %s"
> void do_mark3(const char *format, ...)
> {
> va_list ap;
> int value;
> const char *s1, *s2;
>
> va_start(ap, format);
> value = va_arg(ap, int);
> s1 = va_arg(ap, const char*);
> s2 = va_arg(ap, const char *);
>
> printk("value is %d %s %s\n",
> value, s1, s2);
> va_end(ap);
> }
>
> int init_module(void)
> {
> int result;
> result = marker_set_probe("subsys_mark1", DO_MARK1_FORMAT,
> (marker_probe_func*)do_mark1);
> if(!result) goto end;
> result = marker_set_probe("subsys_mark2", NULL,
> (marker_probe_func*)do_mark2);
> if(!result) goto cleanup1;
> result = marker_set_probe("subsys_mark3", DO_MARK3_FORMAT,
> (marker_probe_func*)do_mark3);
> if(!result) goto cleanup2;
>
> return 0;
>
> cleanup2:
> marker_remove_probe((marker_probe_func*)do_mark2);
> cleanup1:
> marker_remove_probe((marker_probe_func*)do_mark1);
> end:
> return -EPERM;
> }
>
> void cleanup_module(void)
> {
> marker_remove_probe((marker_probe_func*)do_mark1);
> marker_remove_probe((marker_probe_func*)do_mark2);
> marker_remove_probe((marker_probe_func*)do_mark3);
> }
>
> MODULE_LICENSE("GPL");
> MODULE_AUTHOR("Mathieu Desnoyers");
> MODULE_DESCRIPTION("Probe");
> ---END---
>
>
> ---BEGIN---
> /* test-mark.c
> *
> */
>
> #include <linux/marker.h>
> #include <linux/module.h>
> #include <linux/proc_fs.h>
> #include <linux/sched.h>
> #include <asm/ptrace.h>
>
> volatile int x = 7;
>
> struct proc_dir_entry *pentry = NULL;
>
> static inline void test(struct pt_regs * regs)
> {
> MARK(kernel_debug_test, "%d %ld %p", 2, regs->eip, regs);
> }
>
> static int my_open(struct inode *inode, struct file *file)
> {
> unsigned int i;
>
> for(i=0; i<2; i++) {
> MARK(subsys_mark1, "%d", 1);
> }
> MARK(subsys_mark2, "%d %s %s", 2, "blah2", "blahx");
> MARK(subsys_mark3, "%d %s %s", x, "blah3", "blah5");
> test(NULL);
> test(NULL);
>
> return -EPERM;
> }
>
>
> static struct file_operations my_operations = {
> .open = my_open,
> };
>
> int init_module(void)
> {
> pentry = create_proc_entry("testmark", 0444, NULL);
> if (pentry)
> pentry->proc_fops = &my_operations;
>
> marker_list_probe(NULL);
>
> return 0;
> }
>
> void cleanup_module(void)
> {
> remove_proc_entry("testmark", NULL);
> }
>
> MODULE_LICENSE("GPL");
> MODULE_AUTHOR("Mathieu Desnoyers");
> MODULE_DESCRIPTION("Marker Test");
> ---END---
>
>
> OpenPGP public key: http://krystal.dyndns.org:8080/key/compudj.gpg
> Key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
>
OpenPGP public key: http://krystal.dyndns.org:8080/key/compudj.gpg
Key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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