Immediate values provide a way to use dynamic code patching to update variables sitting within the instruction stream. It saves caches lines normally used by static read mostly variables. Signed-off-by: Mathieu Desnoyers CC: Adrian Bunk CC: Andi Kleen --- arch/alpha/Kconfig | 6 ++++++ arch/arm/Kconfig | 6 ++++++ arch/arm26/Kconfig | 6 ++++++ arch/avr32/Kconfig.debug | 7 +++++++ arch/cris/Kconfig | 6 ++++++ arch/frv/Kconfig | 6 ++++++ arch/h8300/Kconfig | 6 ++++++ arch/i386/Kconfig | 2 ++ arch/ia64/Kconfig | 3 +++ arch/m32r/Kconfig | 6 ++++++ arch/m68k/Kconfig | 6 ++++++ arch/m68knommu/Kconfig | 6 ++++++ arch/mips/Kconfig | 6 ++++++ arch/parisc/Kconfig | 6 ++++++ arch/powerpc/Kconfig | 3 +++ arch/ppc/Kconfig | 6 ++++++ arch/s390/Kconfig | 2 ++ arch/sh/Kconfig | 6 ++++++ arch/sh64/Kconfig | 6 ++++++ arch/sparc/Kconfig | 2 ++ arch/sparc64/Kconfig | 3 +++ arch/um/Kconfig | 6 ++++++ arch/v850/Kconfig | 6 ++++++ arch/x86_64/Kconfig | 3 +++ arch/xtensa/Kconfig | 6 ++++++ kernel/Kconfig.immediate | 11 +++++++++++ 26 files changed, 138 insertions(+) Index: linux-2.6-lttng/arch/alpha/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/alpha/Kconfig 2007-07-13 14:17:59.000000000 -0400 +++ linux-2.6-lttng/arch/alpha/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -653,6 +653,12 @@ source "arch/alpha/oprofile/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/alpha/Kconfig.debug" # DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig Index: linux-2.6-lttng/arch/arm/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/arm/Kconfig 2007-07-13 14:17:59.000000000 -0400 +++ linux-2.6-lttng/arch/arm/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -1046,6 +1046,12 @@ source "arch/arm/oprofile/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/arm/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/arm26/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/arm26/Kconfig 2007-07-13 14:17:59.000000000 -0400 +++ linux-2.6-lttng/arch/arm26/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -244,6 +244,12 @@ source "drivers/usb/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/arm26/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/cris/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/cris/Kconfig 2007-07-13 14:17:59.000000000 -0400 +++ linux-2.6-lttng/arch/cris/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -198,6 +198,12 @@ source "drivers/usb/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/cris/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/frv/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/frv/Kconfig 2007-07-13 14:17:59.000000000 -0400 +++ linux-2.6-lttng/arch/frv/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -375,6 +375,12 @@ source "fs/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/frv/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/h8300/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/h8300/Kconfig 2007-07-13 14:17:59.000000000 -0400 +++ linux-2.6-lttng/arch/h8300/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -223,6 +223,12 @@ source "fs/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/h8300/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/i386/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/i386/Kconfig 2007-07-13 14:17:59.000000000 -0400 +++ linux-2.6-lttng/arch/i386/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -1249,6 +1249,8 @@ for kernel debugging, non-intrusive instrumentation and testing. If in doubt, say "N". +source "kernel/Kconfig.immediate" + endif # INSTRUMENTATION source "arch/i386/Kconfig.debug" Index: linux-2.6-lttng/arch/ia64/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/ia64/Kconfig 2007-07-13 14:17:59.000000000 -0400 +++ linux-2.6-lttng/arch/ia64/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -593,6 +593,9 @@ 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.immediate" + endmenu source "arch/ia64/Kconfig.debug" Index: linux-2.6-lttng/arch/m32r/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/m32r/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/m32r/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -408,6 +408,12 @@ source "arch/m32r/oprofile/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/m32r/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/m68k/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/m68k/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/m68k/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -676,6 +676,12 @@ source "fs/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/m68k/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/m68knommu/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/m68knommu/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/m68knommu/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -668,6 +668,12 @@ source "fs/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/m68knommu/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/mips/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/mips/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/mips/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -1946,6 +1946,12 @@ source "arch/mips/oprofile/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/mips/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/parisc/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/parisc/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/parisc/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -269,6 +269,12 @@ source "arch/parisc/oprofile/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/parisc/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/powerpc/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/powerpc/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/powerpc/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -655,6 +655,9 @@ 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.immediate" + endmenu source "arch/powerpc/Kconfig.debug" Index: linux-2.6-lttng/arch/ppc/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/ppc/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/ppc/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -1451,8 +1451,14 @@ source "lib/Kconfig" +menu "Instrumentation Support" + source "arch/powerpc/oprofile/Kconfig" +source "kernel/Kconfig.immediate" + +endmenu + source "arch/ppc/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/s390/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/s390/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/s390/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -547,6 +547,8 @@ for kernel debugging, non-intrusive instrumentation and testing. If in doubt, say "N". +source "kernel/Kconfig.immediate" + endmenu source "arch/s390/Kconfig.debug" Index: linux-2.6-lttng/arch/sh/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/sh/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/sh/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -721,6 +721,12 @@ source "arch/sh/oprofile/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/sh/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/sh64/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/sh64/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/sh64/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -284,6 +284,12 @@ source "arch/sh64/oprofile/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/sh64/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/sparc/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/sparc/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/sparc/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -313,6 +313,8 @@ source "arch/sparc/oprofile/Kconfig" +source "kernel/Kconfig.immediate" + endmenu source "arch/sparc/Kconfig.debug" Index: linux-2.6-lttng/arch/sparc64/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/sparc64/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/sparc64/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -451,6 +451,9 @@ 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.immediate" + endmenu source "arch/sparc64/Kconfig.debug" Index: linux-2.6-lttng/arch/um/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/um/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/um/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -335,4 +335,10 @@ bool default n +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/um/Kconfig.debug" Index: linux-2.6-lttng/arch/v850/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/v850/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/v850/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -331,6 +331,12 @@ source "drivers/usb/Kconfig" +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/v850/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/arch/x86_64/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/x86_64/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/x86_64/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -842,6 +842,9 @@ 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.immediate" + endmenu source "arch/x86_64/Kconfig.debug" Index: linux-2.6-lttng/arch/xtensa/Kconfig =================================================================== --- linux-2.6-lttng.orig/arch/xtensa/Kconfig 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/xtensa/Kconfig 2007-07-13 14:33:51.000000000 -0400 @@ -251,6 +251,12 @@ provide one yourself. endmenu +menu "Instrumentation Support" + +source "kernel/Kconfig.immediate" + +endmenu + source "arch/xtensa/Kconfig.debug" source "security/Kconfig" Index: linux-2.6-lttng/kernel/Kconfig.immediate =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6-lttng/kernel/Kconfig.immediate 2007-07-13 14:33:47.000000000 -0400 @@ -0,0 +1,11 @@ +# Immediate values configuration + +config IMMEDIATE + bool "Enable immediate values" + depends on X86_32 || PPC + default y if !EMBEDDED + help + Immediate values are used as read mostly variables that are rarely + updated. They use code patching to modify the values inscribed in the + instruction stream. It provides a way to save precious cache lines + that would otherwise have to be used by these variables. Index: linux-2.6-lttng/arch/avr32/Kconfig.debug =================================================================== --- linux-2.6-lttng.orig/arch/avr32/Kconfig.debug 2007-07-13 14:18:00.000000000 -0400 +++ linux-2.6-lttng/arch/avr32/Kconfig.debug 2007-07-13 14:33:51.000000000 -0400 @@ -6,6 +6,9 @@ source "lib/Kconfig.debug" +menu "Instrumentation Support" + depends on EXPERIMENTAL + config KPROBES bool "Kprobes" depends on DEBUG_KERNEL @@ -16,4 +19,8 @@ for kernel debugging, non-intrusive instrumentation and testing. If in doubt, say "N". +source "kernel/Kconfig.immediate" + +endmenu + endmenu -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 - 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/