linux-kernel - Re: [PATCH -next v3 1/2] mm/debug_vm_pgtable: Move {pmd/pud}_huge_tests out of CONFIG_TRANSPARENT

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Message-ID: <64dd2a02-e175-e414-9a1b-1de38fdf9547@huawei.com>
Date:   Mon, 10 May 2021 15:24:28 +0800
From:   Liu Shixin <liushixin2@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Anshuman Khandual <anshuman.khandual@....com>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next v3 1/2] mm/debug_vm_pgtable: Move
 {pmd/pud}_huge_tests out of CONFIG_TRANSPARENT_HUGEPAGE

On 2021/5/10 12:26, Andrew Morton wrote:
> On Mon, 19 Apr 2021 15:18:19 +0800 Liu Shixin <liushixin2@...wei.com> wrote:
>
>> The functions {pmd/pud}_set_huge and {pmd/pud}_clear_huge are not dependent
>> on THP. Hence move {pmd/pud}_huge_tests out of CONFIG_TRANSPARENT_HUGEPAGE.
> What is the actual effect of this?  Better test coverage?  Smaller
> kernel?  Larger kernel?
>
> (I'm too lazy to figure this out and it should have been in the
> changelog anyway ;))
> .
>
Better test coverage I think.

And I want to add HUGE_VMAP support for riscv, which doesn't have THP support right now.