linux-kernel - Re: [PATCH] merge_config.sh: Use the first file as the initial config

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Date:	Thu, 02 Feb 2012 12:14:57 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	Josh Boyer <jwboyer@...hat.com>
Cc:	Michal Marek <mmarek@...e.cz>, kernel-team@...oraproject.org,
	linux-kernel@...r.kernel.org, Darren Hart <dvhart@...ux.intel.com>
Subject: Re: [PATCH] merge_config.sh: Use the first file as the initial
 config

On Wed, 2012-02-01 at 12:01 -0500, Josh Boyer wrote:
> Take the first config fragment and use it verbatim as the initial config set.
> This avoids running the verification loop for the first file, as nothing has
> actually been merged at this point.  This significantly increases performance
> for large config fragments.
> 
> Signed-off-by: Josh Boyer <jwboyer@...hat.com>
> ---
> 
> When experimenting with merge_config.sh on the Fedora config fragments, this
> cut the execution time of a single invocation with all the config fragments
> in half (from 28 seconds to 13 seconds).

Adding Darren to the CC.

Nice! Looks ok to me.

Acked-by: John Stultz <john.stultz@...aro.org>

>  scripts/kconfig/merge_config.sh |    6 +++++-
>  1 files changed, 5 insertions(+), 1 deletions(-)
> 
> diff --git a/scripts/kconfig/merge_config.sh b/scripts/kconfig/merge_config.sh
> index ceadf0e..23d738a 100644
> --- a/scripts/kconfig/merge_config.sh
> +++ b/scripts/kconfig/merge_config.sh
> @@ -58,12 +58,16 @@ while true; do
>  	esac
>  done
> 
> -
> +INITFILE=$1
> +shift;
> 
>  MERGE_LIST=$*
>  SED_CONFIG_EXP="s/^\(# \)\{0,1\}\(CONFIG_[a-zA-Z0-9_]*\)[= ].*/\2/p"
>  TMP_FILE=$(mktemp ./.tmp.config.XXXXXXXXXX)
> 
> +echo "Using $INITFILE as base"
> +cat $INITFILE > $TMP_FILE
> +
>  # Merge files, printing warnings on overrided values
>  for MERGE_FILE in $MERGE_LIST ; do
>  	echo "Merging $MERGE_FILE"


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