linux-kernel - Re: [PATCH v2 4/4] hugetlbfs: clean up command line processing

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Date:   Wed, 1 Apr 2020 11:55:01 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, sparclinux@...r.kernel.org,
        linux-doc@...r.kernel.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Longpeng <longpeng2@...wei.com>,
        Christophe Leroy <christophe.leroy@....fr>,
        Mina Almasry <almasrymina@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 4/4] hugetlbfs: clean up command line processing

On 4/1/20 11:38 AM, Mike Kravetz wrote:
> With all hugetlb page processing done in a single file clean up code.
> - Make code match desired semantics
>   - Update documentation with semantics
> - Make all warnings and errors messages start with 'HugeTLB:'.
> - Consistently name command line parsing routines.
> - Check for hugepages_supported() before processing parameters.
> - Add comments to code
>   - Describe some of the subtle interactions
>   - Describe semantics of command line arguments
> 
> Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>
> ---

Hi Mike,
One nit, please see below:

>  .../admin-guide/kernel-parameters.txt         | 35 ++++---
>  Documentation/admin-guide/mm/hugetlbpage.rst  | 44 +++++++++
>  mm/hugetlb.c                                  | 96 +++++++++++++++----
>  3 files changed, 142 insertions(+), 33 deletions(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 1bd5454b5e5f..de653cfe1726 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -832,12 +832,15 @@
>  			See also Documentation/networking/decnet.txt.
>  
>  	default_hugepagesz=
> -			[same as hugepagesz=] The size of the default
> -			HugeTLB page size. This is the size represented by
> -			the legacy /proc/ hugepages APIs, used for SHM, and
> -			default size when mounting hugetlbfs filesystems.
> -			Defaults to the default architecture's huge page size
> -			if not specified.
> +			[HW] The size of the default HugeTLB page size. This

			Drop one "size" above?

> +			is the size represented by the legacy /proc/ hugepages
> +			APIs.  In addition, this is the default hugetlb size
> +			used for shmget(), mmap() and mounting hugetlbfs
> +			filesystems.  If not specified, defaults to the
> +			architecture's default huge page size.  Huge page
> +			sizes are architecture dependent.  See also
> +			Documentation/admin-guide/mm/hugetlbpage.rst.
> +			Format: size[KMG]



-- 
~Randy