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

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Date: Mon, 01 Apr 2024 11:20:33 -0400
From: Zi Yan <ziy@...dia.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>, Yu Zhao <yuzhao@...gle.com>
Subject: Re: [PATCH] mm: alloc_anon_folio: avoid doing vma_thp_gfp_mask in
 fallback cases

On 29 Mar 2024, at 3:37, Barry Song 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.
>
> Cc: Ryan Roberts <ryan.roberts@....com>
> Cc: Kefeng Wang <wangkefeng.wang@...wei.com>
> Cc: John Hubbard <jhubbard@...dia.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Alistair Popple <apopple@...dia.com>
> Cc: Anshuman Khandual <anshuman.khandual@....com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: "Huang, Ying" <ying.huang@...el.com>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Itaru Kitayama <itaru.kitayama@...il.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Luis Chamberlain <mcgrof@...nel.org>
> Cc: Matthew Wilcox (Oracle) <willy@...radead.org>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Yang Shi <shy828301@...il.com>
> Cc: Yin Fengwei <fengwei.yin@...el.com>
> Cc: Yu Zhao <yuzhao@...gle.com>
> Cc: Zi Yan <ziy@...dia.com>
> Signed-off-by: Barry Song <v-songbaohua@...o.com>
> ---
>  mm/memory.c | 3 +++
>  1 file changed, 3 insertions(+)

LGTM. Reviewed-by: Zi Yan <ziy@...dia.com>

--
Best Regards,
Yan, Zi

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