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Message-ID: <ce2f10ad-bbdf-4948-b784-b497e8973e6e@t-8ch.de>
Date: Sat, 29 Jul 2023 08:44:32 +0200
From: Thomas Weißschuh <thomas@...ch.de>
To: Zhangjin Wu <falcon@...ylab.org>
Cc: w@....eu, arnd@...db.de, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v3 12/12] selftests/nolibc: speed up some targets with
multiple jobs
On 2023-07-28 04:35:01+0800, Zhangjin Wu wrote:
> The sysroot install and kernel build targets are time cost, let's use
> -j<N> to parallelize them with multiple jobs.
>
> Signed-off-by: Zhangjin Wu <falcon@...ylab.org>
> ---
> tools/testing/selftests/nolibc/Makefile | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
> index ad2538ec5eb0..1b45c22f9a94 100644
> --- a/tools/testing/selftests/nolibc/Makefile
> +++ b/tools/testing/selftests/nolibc/Makefile
> @@ -171,7 +171,7 @@ PHONY = sysroot/$(ARCH)/include
> sysroot/$(ARCH)/include:
> $(Q)rm -rf sysroot/$(ARCH) sysroot/sysroot
> $(QUIET_MKDIR)mkdir -p sysroot
> - $(Q)$(MAKE) -C ../../../include/nolibc ARCH=$(ARCH) OUTPUT=$(CURDIR)/sysroot/ headers_standalone
> + $(Q)$(MAKE) -j$$(nproc) -C ../../../include/nolibc ARCH=$(ARCH) OUTPUT=$(CURDIR)/sysroot/ headers_standalone
This should already work when the users specify -j on the make command
line themselves.
I'm not a fan of force-enabling it here.
> $(Q)mv sysroot/sysroot sysroot/$(ARCH)
>
> ifneq ($(NOLIBC_SYSROOT),0)
> @@ -211,7 +211,7 @@ initramfs: nolibc-test
> $(Q)cp nolibc-test initramfs/init
>
> # common macros for kernel targets
> -MAKE_KERNEL = $(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE)
> +MAKE_KERNEL = $(MAKE) -j$$(nproc) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE)
> KERNEL_CONFIG = $(objtree)/.config
> KERNEL_IMAGE = $(objtree)/$(IMAGE)
>
> --
> 2.25.1
>
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