linux-kernel - Re: [RFC PATCH v2 12/12] mm: make MAX_ORDER a kernel boot time parameter.

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Message-ID: <762F50AE-E28B-4EB1-B302-14B9596B5FCC@nvidia.com>
Date:   Fri, 12 Aug 2022 22:38:09 -0400
From:   Zi Yan <ziy@...dia.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     linux-mm@...ck.org, David Hildenbrand <david@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Yang Shi <shy828301@...il.com>,
        David Rientjes <rientjes@...gle.com>,
        James Houghton <jthoughton@...gle.com>,
        Mike Rapoport <rppt@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 12/12] mm: make MAX_ORDER a kernel boot time
 parameter.



On 12 Aug 2022, at 21:11, Randy Dunlap wrote:

> Hi--
>
> On 8/11/22 16:16, Zi Yan wrote:
>> diff --git a/mm/Kconfig b/mm/Kconfig
>> index e558f5679707..acccb919d72d 100644
>> --- a/mm/Kconfig
>> +++ b/mm/Kconfig
>> @@ -455,6 +455,19 @@ config SET_MAX_ORDER
>>  	  increase this value. A value of 10 means that the largest free memory
>>  	  block is 2^10 pages.
>>
>> +config BOOT_TIME_MAX_ORDER
>> +	bool "Set maximum order of buddy allocator at boot time"
>> +	depends on SPARSEMEM_VMEMMAP && (ARCH_FORCE_MAX_ORDER != 0 || SET_MAX_ORDER != 0)
>> +	help
>> +	  It enables users to set the maximum order of buddy allocator at system
>> +      boot time instead of a static MACRO set at compilation time. Systems with
>> +      a lot of memory might want to allocate large pages whereas it is much
>> +      less feasible and desirable for systems with less memory. This option
>> +      allows different systems to control the largest page they want to
>> +      allocate. By default, MAX_ORDER will be set to ARCH_FORCE_MAX_ORDER or
>> +      SET_MAX_ORDER, whichever is non-zero, when the boot time parameter is not
>> +      set. The maximum of MAX_ORDER is currently limited at 256.
>
> Please make sure that all lines of help text are indented with one tab + 2 spaces,
> as specified in Documentation/process/coding-style.rst.

Thanks. I fixed it locally.

--
Best Regards,
Yan, Zi

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