From: =?UTF-8?q?Rados=C5=82aw=20Smogura?= Subject: =?UTF-8?q?=5BPATCH=2001/18=5D=20Added=20hacking=20menu=20for=20override=20optimization=20by=20GCC=2E?= Date: Thu, 16 Feb 2012 15:31:28 +0100 Message-ID: <1329402705-25454-1-git-send-email-mail@smogura.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Cc: Yongqiang Yang , mail@smogura.eu, linux-ext4@vger.kernel.org To: linux-mm@kvack.org Return-path: Sender: owner-linux-mm@kvack.org List-Id: linux-ext4.vger.kernel.org From: mail@smogura.eu This patch gives ability for add some "-fno-..." options for GCC and to force -O1 optimization. Supporting files, like Kconfig, Makefile are auto-generated due to large amount of available options. Patch helps to debug kernel. --- Makefile | 11 ++++ lib/Kconfig.debug | 2 + lib/Kconfig.debug.optim | 102 ++++++++++++++++++++++++++++++= ++++++ scripts/Makefile.optim.inc | 23 ++++++++ scripts/debug/make_config_optim.sh | 88 ++++++++++++++++++++++++++++++= + 5 files changed, 226 insertions(+), 0 deletions(-) create mode 100644 lib/Kconfig.debug.optim create mode 100644 scripts/Makefile.optim.inc create mode 100644 scripts/debug/make_config_optim.sh diff --git a/Makefile b/Makefile index 7c44b67..bc9a961 100644 --- a/Makefile +++ b/Makefile @@ -558,12 +558,23 @@ endif # $(dot-config) # Defaults to vmlinux, but the arch makefile usually adds further target= s all: vmlinux =20 +ifdef CONFIG_HACK_OPTIM_FORCE_O1_LEVEL +KBUILD_CFLAGS +=3D -O1 +else + ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE KBUILD_CFLAGS +=3D -Os else KBUILD_CFLAGS +=3D -O2 endif =20 +endif + +# Include makefile for optimization override +ifdef CONFIG_HACK_OPTIM +include $(srctree)/scripts/Makefile.optim.inc +endif + include $(srctree)/arch/$(SRCARCH)/Makefile =20 ifneq ($(CONFIG_FRAME_WARN),0) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 8745ac7..928265e 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1274,5 +1274,7 @@ source "lib/Kconfig.kgdb" =20 source "lib/Kconfig.kmemcheck" =20 +source "lib/Kconfig.debug.optim" + config TEST_KSTRTOX tristate "Test kstrto*() family of functions at runtime" diff --git a/lib/Kconfig.debug.optim b/lib/Kconfig.debug.optim new file mode 100644 index 0000000..09b1012 --- /dev/null +++ b/lib/Kconfig.debug.optim @@ -0,0 +1,102 @@ +# This file was auto generated. It's utility configuration +# Distributed under GPL v2 License + +menuconfig HACK_OPTIM + bool "Allows to override GCC optimization" + depends on DEBUG_KERNEL && EXPERIMENTAL + help + If you say Y here you will be able to override + how GCC optimize kernel code. This will create + more debug friendly, but with not guarentee + about same runi, like production, kernel. + + If you say Y here probably You will want say + for all suboptions + +if HACK_OPTIM + +config HACK_OPTIM_FORCE_O1_LEVEL + bool "Forces -O1 optimization level" + ---help--- + This will change how GCC optimize code. Code + may be slower and larger but will be more debug + "friendly". + + In some cases there is low chance that kernel + will run different then normal, reporting or not + some bugs or errors. Refere to GCC manual for + more details. + + You SHOULD say N here. + +config HACK_OPTIM__fno_inline_functions_called_once + bool "Adds -fno-inline-functions-called-once parameter to gcc invoke li= ne." + ---help--- + This will change how GCC optimize code. Code + may be slower and larger but will be more debug + "friendly". + + In some cases there is low chance that kernel + will run different then normal, reporting or not + some bugs or errors. Refere to GCC manual for + more details. + + You SHOULD say N here. + +config HACK_OPTIM__fno_combine_stack_adjustments + bool "Adds -fno-combine-stack-adjustments parameter to gcc invoke line.= " + ---help--- + This will change how GCC optimize code. Code + may be slower and larger but will be more debug + "friendly". + + In some cases there is low chance that kernel + will run different then normal, reporting or not + some bugs or errors. Refere to GCC manual for + more details. + + You SHOULD say N here. + +config HACK_OPTIM__fno_tree_dce + bool "Adds -fno-tree-dce parameter to gcc invoke line." + ---help--- + This will change how GCC optimize code. Code + may be slower and larger but will be more debug + "friendly". + + In some cases there is low chance that kernel + will run different then normal, reporting or not + some bugs or errors. Refere to GCC manual for + more details. + + You SHOULD say N here. + +config HACK_OPTIM__fno_tree_dominator_opts + bool "Adds -fno-tree-dominator-opts parameter to gcc invoke line." + ---help--- + This will change how GCC optimize code. Code + may be slower and larger but will be more debug + "friendly". + + In some cases there is low chance that kernel + will run different then normal, reporting or not + some bugs or errors. Refere to GCC manual for + more details. + + You SHOULD say N here. + +config HACK_OPTIM__fno_dse + bool "Adds -fno-dse parameter to gcc invoke line." + ---help--- + This will change how GCC optimize code. Code + may be slower and larger but will be more debug + "friendly". + + In some cases there is low chance that kernel + will run different then normal, reporting or not + some bugs or errors. Refere to GCC manual for + more details. + + You SHOULD say N here. + +endif #HACK_OPTIM diff --git a/scripts/Makefile.optim.inc b/scripts/Makefile.optim.inc new file mode 100644 index 0000000..e78cc92 --- /dev/null +++ b/scripts/Makefile.optim.inc @@ -0,0 +1,23 @@ +# This file was auto generated. It's utility configuration +# Distributed under GPL v2 License + +ifdef CONFIG_HACK_OPTIM__fno_inline_functions_called_once + KBUILD_CFLAGS +=3D -fno-inline-functions-called-once +endif + +ifdef CONFIG_HACK_OPTIM__fno_combine_stack_adjustments + KBUILD_CFLAGS +=3D -fno-combine-stack-adjustments +endif + +ifdef CONFIG_HACK_OPTIM__fno_tree_dce + KBUILD_CFLAGS +=3D -fno-tree-dce +endif + +ifdef CONFIG_HACK_OPTIM__fno_tree_dominator_opts + KBUILD_CFLAGS +=3D -fno-tree-dominator-opts +endif + +ifdef CONFIG_HACK_OPTIM__fno_dse + KBUILD_CFLAGS +=3D -fno-dse +endif + diff --git a/scripts/debug/make_config_optim.sh b/scripts/debug/make_conf= ig_optim.sh new file mode 100644 index 0000000..26865923 --- /dev/null +++ b/scripts/debug/make_config_optim.sh @@ -0,0 +1,88 @@ +#!/bin/sh + +## Utility script for generating optimization override options +## for kernel compilation. +## +## Distributed under GPL v2 license +## (c) Rados=C5=82aw Smogura, 2011 + +# Prefix added for variable +CFG_PREFIX=3D"HACK_OPTIM" + +KCFG=3D"Kconfig.debug.optim" +MKFI=3D"Makefile.optim.inc" + +OPTIMIZATIONS_PARAMS=3D"-fno-inline-functions-called-once \ + -fno-combine-stack-adjustments \ + -fno-tree-dce \ + -fno-tree-dominator-opts \ + -fno-dse " + +echo "# This file was auto generated. It's utility configuration" > $KCF= G +echo "# Distributed under GPL v2 License" >> $KCFG +echo >> $KCFG +echo "menuconfig ${CFG_PREFIX}" >> $KCFG +echo -e "\tbool \"Allows to override GCC optimization\"" >> $KCFG +echo -e "\tdepends on DEBUG_KERNEL && EXPERIMENTAL" >> $KCFG +echo -e "\thelp" >> $KCFG +echo -e "\t If you say Y here you will be able to override" >> $KCFG +echo -e "\t how GCC optimize kernel code. This will create" >> $KCFG +echo -e "\t more debug friendly, but with not guarentee" >> $KCFG +echo -e "\t about same runi, like production, kernel." >> $KCFG +echo >> $KCFG +echo -e "\t If you say Y here probably You will want say" >> $KCFG +echo -e "\t for all suboptions" >> $KCFG +echo >> $KCFG +echo "if ${CFG_PREFIX}" >> $KCFG +echo >> $KCFG + +echo "# This file was auto generated. It's utility configuration" > $MKF= I +echo "# Distributed under GPL v2 License" >> $MKFI +echo >> $MKFI + +# Insert standard override optimization level +# This is exception, and this value will not be included +# in auto generated makefile. Support for this value +# is hard coded in main Makefile. +echo -e "config ${CFG_PREFIX}_FORCE_O1_LEVEL" >> $KCFG +echo -e "\tbool \"Forces -O1 optimization level\"" >> $KCFG +echo -e "\t---help---" >> $KCFG +echo -e "\t This will change how GCC optimize code. Code" >> $KCFG +echo -e "\t may be slower and larger but will be more debug" >> $KCFG +echo -e "\t \"friendly\"." >> $KCFG +echo >> $KCFG +echo -e "\t In some cases there is low chance that kernel" >> $KCFG +echo -e "\t will run different then normal, reporting or not" >> $KCFG +echo -e "\t some bugs or errors. Refere to GCC manual for" >> $KCFG +echo -e "\t more details." >> $KCFG +echo >> $KCFG +echo -e "\t You SHOULD say N here." >> $KCFG +echo >> $KCFG + +for o in $OPTIMIZATIONS_PARAMS ; do + cfg_o=3D"${CFG_PREFIX}_${o//-/_}"; + echo "Processing param ${o} config variable will be $cfg_o"; + + # Generate kconfig entry + echo -e "config ${cfg_o}" >> $KCFG + echo -e "\tbool \"Adds $o parameter to gcc invoke line.\"" >> $KCFG + echo -e "\t---help---" >> $KCFG + echo -e "\t This will change how GCC optimize code. Code" >> $KCFG + echo -e "\t may be slower and larger but will be more debug" >> $KCFG + echo -e "\t \"friendly\"." >> $KCFG + echo >> $KCFG + echo -e "\t In some cases there is low chance that kernel" >> $KCFG + echo -e "\t will run different then normal, reporting or not" >> $KCFG + echo -e "\t some bugs or errors. Refere to GCC manual for" >> $KCFG + echo -e "\t more details." >> $KCFG + echo >> $KCFG + echo -e "\t You SHOULD say N here." >> $KCFG + echo >> $KCFG + + #Generate Make for include + echo "ifdef CONFIG_${cfg_o}" >> $MKFI + echo -e "\tKBUILD_CFLAGS +=3D $o" >> $MKFI + echo "endif" >> $MKFI + echo >> $MKFI +done; +echo "endif #${CFG_PREFIX}" >> $KCFG --=20 1.7.3.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter= .ca/ Don't email: email@kvack.org