Re: [OE-core] [PATCH] kernel: improve initramfs bundle processing time

[Paul Gortmaker <paul.gortmaker@windriver.com>]

[[OE-core] [PATCH] kernel: improve initramfs bundle processing time] On 14/04/2023 (Fri 15:29) Bruce Ashfield via lists.openembedded.org wrote:

> From: Bruce Ashfield <bruce.ashfield@gmail.com>
> 
> This is a partial fix for bugzilla 15059 [https://bugzilla.yoctoproject.org/show_bug.cgi?id=15059]
> 
> It has been noted by several people that when an initramfs is bundled:
> 
>   - a lot of the kernel is rebuilt
>   - it takes a really long time
> 
> When looking at the logs, the second kernel compilation (that performs
> the bundle) is not using the parallel make settings, and builds with
> -j1.
> 
> We are already explicitly passing PARALLEL_MAKE when building kernel
> modules, and by extending that explicit use to the main kernel
> compilation, we ensure that we always get a parallel build.
> 
> Build times chnaged from more than 30 minutes for the bundle, to
> 3 minutes in local testing.

I've seen this a bunch of times in the stuff I'm working on, and the
incremental fix to go from 30m to 3m is super welcome.  Thanks.

> The question of whether or not too much is rebuilding during the
> bundle step is still an open question, but with this tweak, at least
> the build time is back in the realm of acceptable.

Thank you for the incremental fix.  If I can help with the
over-rebuilding aspect, I will.  Let me know.

Paul.
--

> 
> Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
> ---
>  meta/classes-recipe/kernel.bbclass | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/meta/classes-recipe/kernel.bbclass b/meta/classes-recipe/kernel.bbclass
> index aefa0d21bc..e634eabd49 100644
> --- a/meta/classes-recipe/kernel.bbclass
> +++ b/meta/classes-recipe/kernel.bbclass
> @@ -382,7 +382,7 @@ kernel_do_compile() {
>  		use_alternate_initrd=CONFIG_INITRAMFS_SOURCE=${B}/usr/${INITRAMFS_IMAGE_NAME}.cpio
>  	fi
>  	for typeformake in ${KERNEL_IMAGETYPE_FOR_MAKE} ; do
> -		oe_runmake ${typeformake} ${KERNEL_EXTRA_ARGS} $use_alternate_initrd
> +		oe_runmake ${PARALLEL_MAKE} ${typeformake} ${KERNEL_EXTRA_ARGS} $use_alternate_initrd
>  	done
>  }
>  
> -- 
> 2.25.1
> 

> 
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> View/Reply Online (#180005): https://lists.openembedded.org/g/openembedded-core/message/180005
> Mute This Topic: https://lists.openembedded.org/mt/98269754/6329300
> Group Owner: openembedded-core+owner@lists.openembedded.org
> Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub [paul.gortmaker@windriver.com]
> -=-=-=-=-=-=-=-=-=-=-=-
>