linux-kernel - Re: [PATCH] scripts/tags.sh: improve compiled sources generation

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Message-ID: <ZHjW9RJ/jinVe5F/@google.com>
Date:   Thu, 1 Jun 2023 17:35:49 +0000
From:   Carlos Llamas <cmllamas@...gle.com>
To:     Jialu Xu <xujialu@...ux.org>
Cc:     gregkh@...uxfoundation.org, cristian.ciocaltea@...labora.com,
        masahiroy@...nel.org, vipinsh@...gle.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scripts/tags.sh: improve compiled sources generation

On Thu, Jun 01, 2023 at 09:04:02AM +0800, Jialu Xu wrote:
> Use grep instead of sed for all compiled sources generation, it is three
> times more efficient.

Although I'm not sure how you obtained a 3x efficiency it did make
things faster for me. I suppose there are several factors involved.
I used defconfig for arm64 and got the following results:
	real    1m50.790s
	real    1m27.907s (with patch)

Tested-by: Carlos Llamas <cmllamas@...gle.com>

> 
> Signed-off-by: Jialu Xu <xujialu@...ux.org>
> ---
>  scripts/tags.sh | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/scripts/tags.sh b/scripts/tags.sh
> index ea31640b2671..938dba219534 100755
> --- a/scripts/tags.sh
> +++ b/scripts/tags.sh
> @@ -98,7 +98,7 @@ all_compiled_sources()
>  	{
>  		echo include/generated/autoconf.h
>  		find $ignore -name "*.cmd" -exec \
> -			sed -n -E 's/^source_.* (.*)/\1/p; s/^  (\S.*) \\/\1/p' {} \+ |
> +			grep -Poh '(?<=^  )\S+|(?<== )\S+[^\\](?=$)' {} \+ |
>  		awk '!a[$0]++'
>  	} | xargs realpath -esq $([ -z "$KBUILD_ABS_SRCTREE" ] && echo --relative-to=.) |
>  	sort -u
> -- 
> 2.30.2
>