linux-kernel - Re: [PATCH v5 2/4] sparc: Advertise gigantic page support

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Message-ID: <ac0c5166-f1f6-5339-58e3-a33f085c1220@ghiti.fr>
Date:   Wed, 6 Mar 2019 14:10:54 -0500
From:   Alex Ghiti <alex@...ti.fr>
To:     David Miller <davem@...emloft.net>
Cc:     vbabka@...e.cz, catalin.marinas@....com, will.deacon@....com,
        benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
        ysato@...rs.sourceforge.jp, dalias@...c.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com, x86@...nel.org,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        mike.kravetz@...cle.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v5 2/4] sparc: Advertise gigantic page support

On 3/6/19 2:04 PM, David Miller wrote:
> From: Alexandre Ghiti <alex@...ti.fr>
> Date: Wed,  6 Mar 2019 14:00:03 -0500
>
>> sparc actually supports gigantic pages and selecting
>> ARCH_HAS_GIGANTIC_PAGE allows it to allocate and free
>> gigantic pages at runtime.
>>
>> sparc allows configuration such as huge pages of 16GB,
>> pages of 8KB and MAX_ORDER = 13 (default):
>> HPAGE_SHIFT (34) - PAGE_SHIFT (13) = 21 >= MAX_ORDER (13)
>>
>> Signed-off-by: Alexandre Ghiti <alex@...ti.fr>
> Much better.
>
> Acked-by: David S. Miller <davem@...emloft.net>
Thanks !

Alex