linux-kernel - Re: [PATCH v2] RISC-V: Add fragmented config for debug options

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Date:   Fri, 6 Dec 2019 09:00:59 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Anup Patel <Anup.Patel@....com>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Atish Patra <Atish.Patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Christoph Hellwig <hch@....de>,
        Anup Patel <anup@...infault.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] RISC-V: Add fragmented config for debug options

On Thu, Dec 05, 2019 at 05:49:18PM +0000, Anup Patel wrote:
> Various Linux kernel DEBUG options have big performance impact so
> these should not be enabled in RISC-V normal defconfigs.
> 
> Instead we should have separate RISC-V fragmented config for enabling
> these DEBUG options. This way Linux RISC-V kernel can be built for
> both non-debug and debug purposes using same defconfig.
> 
> This patch moves additional DEBUG options to extra_debug.config.
> 
> To configure a non-debug RV64 kernel, we use our normal defconfig:
>    $ make O=<linux_build_directory> defconfig
> Wherease to configure a debug RV64 kernel, we use extra_debug.config:
>    $ make O=<linux_build_directory> defconfig extra_debug.config
> 
> Signed-off-by: Anup Patel <anup.patel@....com>
> ---
> Changes since v1:
>  - Use fragmented .config instead of separate debug defconfigs.
> ---
>  arch/riscv/configs/defconfig          | 23 -----------------------
>  arch/riscv/configs/extra_debug.config | 21 +++++++++++++++++++++

Might be better to call this rv_debug.config (or riscv_debug.config),
This would imply it is a set of options recommended by riscv
maintainers and also having a suitable prefix means it is less
likely to ever conflict with .config files in kernel/configs .

BTW don't respin the patch on my account. Using a .config file was just
an idea and I'm not sure it reached consensus on the v1 thread.


Daniel.


>  arch/riscv/configs/rv32_defconfig     | 23 -----------------------
>  3 files changed, 21 insertions(+), 46 deletions(-)
>  create mode 100644 arch/riscv/configs/extra_debug.config
> 
> diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig
> index e2ff95cb3390..f0710d8f50cc 100644
> --- a/arch/riscv/configs/defconfig
> +++ b/arch/riscv/configs/defconfig
> @@ -101,27 +101,4 @@ CONFIG_CRYPTO_USER_API_HASH=y
>  CONFIG_CRYPTO_DEV_VIRTIO=y
>  CONFIG_PRINTK_TIME=y
>  CONFIG_DEBUG_FS=y
> -CONFIG_DEBUG_PAGEALLOC=y
> -CONFIG_DEBUG_VM=y
> -CONFIG_DEBUG_VM_PGFLAGS=y
> -CONFIG_DEBUG_MEMORY_INIT=y
> -CONFIG_DEBUG_PER_CPU_MAPS=y
> -CONFIG_SOFTLOCKUP_DETECTOR=y
> -CONFIG_WQ_WATCHDOG=y
> -CONFIG_SCHED_STACK_END_CHECK=y
> -CONFIG_DEBUG_TIMEKEEPING=y
> -CONFIG_DEBUG_RT_MUTEXES=y
> -CONFIG_DEBUG_SPINLOCK=y
> -CONFIG_DEBUG_MUTEXES=y
> -CONFIG_DEBUG_RWSEMS=y
> -CONFIG_DEBUG_ATOMIC_SLEEP=y
> -CONFIG_STACKTRACE=y
> -CONFIG_DEBUG_LIST=y
> -CONFIG_DEBUG_PLIST=y
> -CONFIG_DEBUG_SG=y
>  # CONFIG_RCU_TRACE is not set
> -CONFIG_RCU_EQS_DEBUG=y
> -CONFIG_DEBUG_BLOCK_EXT_DEVT=y
> -# CONFIG_FTRACE is not set
> -# CONFIG_RUNTIME_TESTING_MENU is not set
> -CONFIG_MEMTEST=y
> diff --git a/arch/riscv/configs/extra_debug.config b/arch/riscv/configs/extra_debug.config
> new file mode 100644
> index 000000000000..66c58bb645a4
> --- /dev/null
> +++ b/arch/riscv/configs/extra_debug.config
> @@ -0,0 +1,21 @@
> +CONFIG_DEBUG_PAGEALLOC=y
> +CONFIG_DEBUG_VM=y
> +CONFIG_DEBUG_VM_PGFLAGS=y
> +CONFIG_DEBUG_MEMORY_INIT=y
> +CONFIG_DEBUG_PER_CPU_MAPS=y
> +CONFIG_SOFTLOCKUP_DETECTOR=y
> +CONFIG_WQ_WATCHDOG=y
> +CONFIG_SCHED_STACK_END_CHECK=y
> +CONFIG_DEBUG_TIMEKEEPING=y
> +CONFIG_DEBUG_RT_MUTEXES=y
> +CONFIG_DEBUG_SPINLOCK=y
> +CONFIG_DEBUG_MUTEXES=y
> +CONFIG_DEBUG_RWSEMS=y
> +CONFIG_DEBUG_ATOMIC_SLEEP=y
> +CONFIG_STACKTRACE=y
> +CONFIG_DEBUG_LIST=y
> +CONFIG_DEBUG_PLIST=y
> +CONFIG_DEBUG_SG=y
> +CONFIG_RCU_EQS_DEBUG=y
> +CONFIG_DEBUG_BLOCK_EXT_DEVT=y
> +CONFIG_MEMTEST=y
> diff --git a/arch/riscv/configs/rv32_defconfig b/arch/riscv/configs/rv32_defconfig
> index eb519407c841..bdec58e6c5f7 100644
> --- a/arch/riscv/configs/rv32_defconfig
> +++ b/arch/riscv/configs/rv32_defconfig
> @@ -98,27 +98,4 @@ CONFIG_CRYPTO_USER_API_HASH=y
>  CONFIG_CRYPTO_DEV_VIRTIO=y
>  CONFIG_PRINTK_TIME=y
>  CONFIG_DEBUG_FS=y
> -CONFIG_DEBUG_PAGEALLOC=y
> -CONFIG_DEBUG_VM=y
> -CONFIG_DEBUG_VM_PGFLAGS=y
> -CONFIG_DEBUG_MEMORY_INIT=y
> -CONFIG_DEBUG_PER_CPU_MAPS=y
> -CONFIG_SOFTLOCKUP_DETECTOR=y
> -CONFIG_WQ_WATCHDOG=y
> -CONFIG_SCHED_STACK_END_CHECK=y
> -CONFIG_DEBUG_TIMEKEEPING=y
> -CONFIG_DEBUG_RT_MUTEXES=y
> -CONFIG_DEBUG_SPINLOCK=y
> -CONFIG_DEBUG_MUTEXES=y
> -CONFIG_DEBUG_RWSEMS=y
> -CONFIG_DEBUG_ATOMIC_SLEEP=y
> -CONFIG_STACKTRACE=y
> -CONFIG_DEBUG_LIST=y
> -CONFIG_DEBUG_PLIST=y
> -CONFIG_DEBUG_SG=y
>  # CONFIG_RCU_TRACE is not set
> -CONFIG_RCU_EQS_DEBUG=y
> -CONFIG_DEBUG_BLOCK_EXT_DEVT=y
> -# CONFIG_FTRACE is not set
> -# CONFIG_RUNTIME_TESTING_MENU is not set
> -CONFIG_MEMTEST=y
> -- 
> 2.17.1
>