From: "Yin, Fengwei" <fengwei.yin@intel.com>
To: Zi Yan <ziy@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>, <linux-mm@kvack.org>,
Vishal Moola <vishal.moola@gmail.com>,
Hugh Dickins <hughd@google.com>, Rik van Riel <riel@surriel.com>,
David Hildenbrand <david@redhat.com>
Subject: Re: Folio mapcount
Date: Sun, 2 Jul 2023 17:50:07 +0800 [thread overview]
Message-ID: <957ea888-a96b-89cc-29e2-973bb9e36f40@intel.com> (raw)
In-Reply-To: <A28053D6-E158-4726-8BE1-B9F4960AD570@nvidia.com>
On 7/1/2023 9:17 AM, Zi Yan wrote:
> In kernel, almost all code only cares: 1) if a page/folio has extra pins
> by checking if mapcount is equal to refcount + extra, and 2)
> if a page/folio is mapped multiple times. A single mapcount can meet
> these two needs.
For 2, how can we know whether a page/folio is mapped multiple times from
single mapcount? My understanding is we need two counts as folio could be
partial mapped.
Regards
Yin, Fengwei
next prev parent reply other threads:[~2023-07-02 9:50 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-24 18:13 Matthew Wilcox
2023-01-24 18:35 ` David Hildenbrand
2023-01-24 18:37 ` David Hildenbrand
2023-01-24 18:35 ` Yang Shi
2023-02-02 3:45 ` Mike Kravetz
2023-02-02 15:31 ` Matthew Wilcox
2023-02-07 16:19 ` Zi Yan
2023-02-07 16:44 ` Matthew Wilcox
2023-02-06 20:34 ` Matthew Wilcox
2023-02-06 22:55 ` Yang Shi
2023-02-06 23:09 ` Matthew Wilcox
2023-02-07 3:06 ` Yin, Fengwei
2023-02-07 4:08 ` Matthew Wilcox
2023-02-07 22:39 ` Peter Xu
2023-02-07 23:27 ` Matthew Wilcox
2023-02-08 19:40 ` Peter Xu
2023-02-08 20:25 ` Matthew Wilcox
2023-02-08 20:58 ` Peter Xu
2023-02-09 15:10 ` Chih-En Lin
2023-02-09 15:43 ` Peter Xu
2023-02-07 22:56 ` James Houghton
2023-02-07 23:08 ` Matthew Wilcox
2023-02-07 23:27 ` James Houghton
2023-02-07 23:35 ` Matthew Wilcox
2023-02-08 0:35 ` James Houghton
2023-02-08 2:26 ` Matthew Wilcox
2023-02-07 16:23 ` Zi Yan
2023-02-07 16:51 ` Matthew Wilcox
2023-02-08 19:36 ` Zi Yan
2023-02-08 19:54 ` Matthew Wilcox
2023-02-10 15:15 ` Zi Yan
2023-03-29 14:02 ` Yin, Fengwei
2023-07-01 1:17 ` Zi Yan
2023-07-02 9:50 ` Yin, Fengwei [this message]
2023-07-02 11:45 ` David Hildenbrand
2023-07-02 12:26 ` Matthew Wilcox
2023-07-03 20:54 ` David Hildenbrand
2023-07-02 19:51 ` Zi Yan
2023-07-03 1:09 ` Yin, Fengwei
2023-07-03 13:24 ` Zi Yan
2023-07-03 20:46 ` David Hildenbrand
2023-07-04 1:22 ` Yin, Fengwei
2023-07-04 2:25 ` Matthew Wilcox
2023-07-03 21:09 ` David Hildenbrand
-- strict thread matches above, loose matches on Subject: below --
2021-12-15 21:55 folio mapcount Matthew Wilcox
2021-12-16 9:37 ` Kirill A. Shutemov
2021-12-16 13:56 ` Matthew Wilcox
2021-12-16 15:19 ` Jason Gunthorpe
2021-12-16 15:54 ` Matthew Wilcox
2021-12-16 16:45 ` David Hildenbrand
2021-12-16 17:01 ` Jason Gunthorpe
2021-12-16 18:56 ` Kirill A. Shutemov
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