Re: [PATCH v1 03/18] mm/rmap: add fast-path for small folios when adding/removing/duplicating

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To: David Hildenbrand <david@xxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH v1 03/18] mm/rmap: add fast-path for small folios when adding/removing/duplicating
From: "Yin, Fengwei" <fengwei.yin@xxxxxxxxx>
Date: Fri, 19 Apr 2024 22:02:11 +0800
Cc: <linux-mm@xxxxxxxxx>, <linux-doc@xxxxxxxxxxxxxxx>, <cgroups@xxxxxxxxxxxxxxx>, <linux-sh@xxxxxxxxxxxxxxx>, <linux-trace-kernel@xxxxxxxxxxxxxxx>, <linux-fsdevel@xxxxxxxxxxxxxxx>, "Andrew Morton" <akpm@xxxxxxxxxxxxxxxxxxxx>, "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Ryan Roberts <ryan.roberts@xxxxxxx>, Yang Shi <shy828301@xxxxxxxxx>, Zi Yan <ziy@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Yoshinori Sato <ysato@xxxxxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>, Chris Zankel <chris@xxxxxxxxxx>, Max Filippov <jcmvbkbc@xxxxxxxxx>, "Muchun Song" <muchun.song@xxxxxxxxx>, Miaohe Lin <linmiaohe@xxxxxxxxxx>, "Naoya Horiguchi" <naoya.horiguchi@xxxxxxx>, Richard Chang <richardycc@xxxxxxxxxx>
In-reply-to: <20240409192301.907377-4-david@redhat.com>
User-agent: Mozilla Thunderbird



On 4/10/2024 3:22 AM, David Hildenbrand wrote:

Let's add a fast-path for small folios to all relevant rmap functions.
Note that only RMAP_LEVEL_PTE applies.

This is a preparation for tracking the mapcount of large folios in a
single value.

Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>


Reviewed-by: Yin Fengwei <fengwei.yin@xxxxxxxxx>

References:
- [PATCH v1 00/18] mm: mapcount for large folios + page_mapcount() cleanups
  - From: David Hildenbrand
- [PATCH v1 03/18] mm/rmap: add fast-path for small folios when adding/removing/duplicating
  - From: David Hildenbrand

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