linux-kernel - Re: [PATCH v3] mm/hugetlb: split hugetlb

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Date:   Wed, 15 Jul 2020 10:05:32 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Cc:     "x86@...nel.org" <x86@...nel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Roman Gushchin <guro@...com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H.Peter Anvin" <hpa@...or.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>
Subject: Re: [PATCH v3] mm/hugetlb: split hugetlb_cma in nodes with memory

On 7/15/20 4:14 AM, Song Bao Hua (Barry Song) wrote:
>> From: Mike Kravetz [mailto:mike.kravetz@...cle.com]
>>  					huge_page_size(h)/1024);
>>
>> +	if (order >= MAX_ORDER && hugetlb_cma_size)
>> +		hugetlb_cma_reserve(order);
> 
> Hello, Mike,
> I am not sure if it is necessarily correct as the order for gigantic pages is arch-dependent:
> https://lkml.org/lkml/2020/7/1/14
> 

See my reply to Wil.

The code to allocate gigantic pages from CMA depends on the arch independent
definition of gigantic page which is 'order >= MAX_ORDER'.

-- 
Mike Kravetz