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Date: Thu, 16 Feb 2012 21:26:00 +0100
From: Radosław Smogura <mail@...gura.eu>
To: Michal Nazarewicz <mina86@...a86.com>
Cc: <linux-mm@...ck.org>, Yongqiang Yang <xiaoqiangnk@...il.com>,
<linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 01/18] Added hacking menu for override optimization by GCC.
On Thu, 16 Feb 2012 11:09:18 -0800, Michal Nazarewicz wrote:
> On Thu, 16 Feb 2012 06:31:28 -0800, Radosław Smogura
> <mail@...gura.eu> wrote:
>> Supporting files, like Kconfig, Makefile are auto-generated due to
>> large amount
>> of available options.
>
> So why not run the script as part of make rather then store generated
> files in
> repository?
Idea to run this script through make is quite good, and should work,
because new mane will be generated before "config" starts.
"Bashizms" are indeed unneeded, I will try to replace this with sed.
>> diff --git a/scripts/debug/make_config_optim.sh
>> b/scripts/debug/make_config_optim.sh
>> new file mode 100644
>> index 0000000..26865923
>> --- /dev/null
>> +++ b/scripts/debug/make_config_optim.sh
>> @@ -0,0 +1,88 @@
>> +#!/bin/sh
>
> The below won't run on POSIX-compatible sh. Address my comments
> below to fix that.
>
>> +
>> +## Utility script for generating optimization override options
>> +## for kernel compilation.
>> +##
>> +## Distributed under GPL v2 license
>> +## (c) Radosław Smogura, 2011
>> +
>> +# Prefix added for variable
>> +CFG_PREFIX="HACK_OPTIM"
>> +
>> +KCFG="Kconfig.debug.optim"
>> +MKFI="Makefile.optim.inc"
>
> How about names that mean something?
>
> KCONFIG=...
> MAKEFILE=...
>
>> +
>> +OPTIMIZATIONS_PARAMS="-fno-inline-functions-called-once \
>> + -fno-combine-stack-adjustments \
>> + -fno-tree-dce \
>> + -fno-tree-dominator-opts \
>> + -fno-dse "
>
> Slashes at end of lines are not necessary here.
>
>> +
>> +echo "# This file was auto generated. It's utility configuration" >
>> $KCFG
>> +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
>
> Use:
>
> cat > $KCFG <<EOF
> ...
> EOF
>
> through the file (of course, in next runs you'll need to use “>>
> $KCFG”).
> More readable and also “-e” argument to echo is bash-specific.
>
> Alternatively to using “> $KCFG” all the time, you can also do:
>
> exec 3> Kconfig.debug.optim
> exec 4> Makefile.optim.inc
>
> at the beginning of the script and later use >&3 and >&4, which will
> save
> you some open/close calls and make the strangely named $KCFG and
> $MKFI
> variables no longer needed.
>
>> +
>> +echo "# This file was auto generated. It's utility configuration" >
>> $MKFI
>> +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 $OPTIMIZATIONS_PARAMS ; do
>> + cfg_o="${CFG_PREFIX}_${o//-/_}";
>
> cfg_o=$CFG_PREFIX_$(echo "$o" | tr '[:lower:]-' '[:upper:]_')
>
>> + 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 += $o" >> $MKFI
>> + echo "endif" >> $MKFI
>> + echo >> $MKFI
>> +done;
>> +echo "endif #${CFG_PREFIX}" >> $KCFG
--
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