linux-kernel - Re: [PATCH] mm: hugetlb: kill set_huge_swap_pte

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Message-ID: <397f73f7-14d6-ee0c-af42-39e193df030c@arm.com>
Date:   Tue, 28 Jun 2022 11:17:32 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Qi Zheng <zhengqi.arch@...edance.com>, mike.kravetz@...cle.com,
        songmuchun@...edance.com, akpm@...ux-foundation.org,
        catalin.marinas@....com, will@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH] mm: hugetlb: kill set_huge_swap_pte_at()



On 6/27/22 20:04, Matthew Wilcox wrote:
> On Mon, Jun 27, 2022 at 01:05:00PM +0530, Anshuman Khandual wrote:
>>> For the swap entry of hugetlb, we need to remember that we should
>>> call set_huge_swap_pte_at() instead of set_huge_pte_at() every
>>
>> Which is intuitive, so what is the problem ?
> 
> The problem is that HugeTLB is DIFFERENT from the rest of the VM.

Agreed.

> This has a huge cost in programmer time, which is infinitely more
> valuable than the cycle shaving you're quibbling over.  We should take
> any and every opportunity to make huge pages work the same way as THP
> and order-0 pages.

Got it.