linux-kernel - Re: [PATCH] mm: alloc_anon_folio: avoid doing vma_thp_gfp

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Message-ID: <CAOUHufbPAAY5WqcxZ8qk2DPG1Yv_Z6iSg6BC_YgfdRJLb+YNDA@mail.gmail.com>
Date: Mon, 1 Apr 2024 10:31:20 -0400
From: Yu Zhao <yuzhao@...gle.com>
To: Barry Song <21cnbao@...il.com>
Cc: akpm@...ux-foundation.org, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, Barry Song <v-songbaohua@...o.com>, 
	Ryan Roberts <ryan.roberts@....com>, Kefeng Wang <wangkefeng.wang@...wei.com>, 
	John Hubbard <jhubbard@...dia.com>, David Hildenbrand <david@...hat.com>, 
	Alistair Popple <apopple@...dia.com>, Anshuman Khandual <anshuman.khandual@....com>, 
	Catalin Marinas <catalin.marinas@....com>, David Rientjes <rientjes@...gle.com>, 
	"Huang, Ying" <ying.huang@...el.com>, Hugh Dickins <hughd@...gle.com>, 
	Itaru Kitayama <itaru.kitayama@...il.com>, 
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>, Luis Chamberlain <mcgrof@...nel.org>, 
	Matthew Wilcox <willy@...radead.org>, Vlastimil Babka <vbabka@...e.cz>, Yang Shi <shy828301@...il.com>, 
	Yin Fengwei <fengwei.yin@...el.com>, Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH] mm: alloc_anon_folio: avoid doing vma_thp_gfp_mask in
 fallback cases

On Fri, Mar 29, 2024 at 3:38 AM Barry Song <21cnbao@...il.com> wrote:
>
> From: Barry Song <v-songbaohua@...o.com>
>
> Fallback rates surpassing 90% have been observed on phones utilizing 64KiB
> CONT-PTE mTHP. In these scenarios, when one out of every 16 PTEs fails
> to allocate large folios, the remaining 15 PTEs fallback. Consequently,
> invoking vma_thp_gfp_mask seems redundant in such cases. Furthermore,
> abstaining from its use can also contribute to improved code readability.

Acked-by: Yu Zhao <yuzhao@...gle.com>