Re: [PATCH v9 03/10] mm: thp: Introduce multi-size THP sysfs interface

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To: Ryan Roberts <ryan.roberts@xxxxxxx>
Subject: Re: [PATCH v9 03/10] mm: thp: Introduce multi-size THP sysfs interface
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 12 Dec 2023 08:27:22 -0800
Cc: David Hildenbrand <david@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Yin Fengwei <fengwei.yin@xxxxxxxxx>, Yu Zhao <yuzhao@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Anshuman Khandual <anshuman.khandual@xxxxxxx>, Yang Shi <shy828301@xxxxxxxxx>, "Huang, Ying" <ying.huang@xxxxxxxxx>, Zi Yan <ziy@xxxxxxxxxx>, Luis Chamberlain <mcgrof@xxxxxxxxxx>, Itaru Kitayama <itaru.kitayama@xxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, John Hubbard <jhubbard@xxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>, Barry Song <21cnbao@xxxxxxxxx>, Alistair Popple <apopple@xxxxxxxxxx>, linux-mm@xxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Barry Song <v-songbaohua@xxxxxxxx>
In-reply-to: <e424982c-8a2f-4c98-83aa-fdb0ee765776@arm.com>
References: <20231207161211.2374093-1-ryan.roberts@arm.com> <20231207161211.2374093-4-ryan.roberts@arm.com> <ff7a3e9c-53cb-4283-9298-781d4fb7c7f8@redhat.com> <e424982c-8a2f-4c98-83aa-fdb0ee765776@arm.com>

On Tue, 12 Dec 2023 15:32:29 +0000 Ryan Roberts <ryan.roberts@xxxxxxx> wrote:

> > Why not perform lock/unlock only once in surrounding code? :)
> 
> I was nervous that sysfs_streq() may be unhappy in atomic context... Unfounded?
> 

Yes, unfounded.

References:
- [PATCH v9 00/10] Multi-size THP for anonymous memory
  - From: Ryan Roberts
- [PATCH v9 03/10] mm: thp: Introduce multi-size THP sysfs interface
  - From: Ryan Roberts
- Re: [PATCH v9 03/10] mm: thp: Introduce multi-size THP sysfs interface
  - From: David Hildenbrand
- Re: [PATCH v9 03/10] mm: thp: Introduce multi-size THP sysfs interface
  - From: Ryan Roberts

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