From: Matthew Wilcox <willy@infradead.org>
To: Peter Xu <peterx@redhat.com>
Cc: David Hildenbrand <david@redhat.com>,
Ryan Roberts <ryan.roberts@arm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-doc@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>,
Mike Kravetz <mike.kravetz@oracle.com>,
Hugh Dickins <hughd@google.com>,
Yin Fengwei <fengwei.yin@intel.com>,
Yang Shi <shy828301@gmail.com>, Zi Yan <ziy@nvidia.com>
Subject: Re: [PATCH mm-unstable v1] mm: add a total mapcount for large folios
Date: Thu, 10 Aug 2023 22:48:41 +0100 [thread overview]
Message-ID: <ZNVbObUGbos73ZJ5@casper.infradead.org> (raw)
In-Reply-To: <ZNVPJ9xxd2oarR3I@x1n>
On Thu, Aug 10, 2023 at 04:57:11PM -0400, Peter Xu wrote:
> AFAICS if that patch was all correct (while I'm not yet sure..), you can
> actually fit your new total mapcount field into page 1 so even avoid the
> extra cacheline access. You can have a look: the trick is refcount for
> tail page 1 is still seems to be free on 32 bits (if that was your worry
> before). Then it'll be very nice if to keep Hugh's counter all in tail 1.
No, refcount must be 0 on all tail pages. We rely on this in many places
in the MM.
next prev parent reply other threads:[~2023-08-10 21:48 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-09 8:32 [PATCH mm-unstable v1] mm: add a total mapcount for large folios David Hildenbrand
2023-08-09 15:45 ` Zi Yan
2023-08-09 19:07 ` Ryan Roberts
2023-08-09 19:17 ` David Hildenbrand
2023-08-10 10:40 ` Ryan Roberts
2023-08-10 11:14 ` David Hildenbrand
2023-08-10 11:27 ` David Hildenbrand
2023-08-10 11:32 ` David Hildenbrand
2023-08-10 11:35 ` Ryan Roberts
2023-08-09 19:21 ` Matthew Wilcox
2023-08-09 19:26 ` David Hildenbrand
2023-08-10 3:14 ` Yin Fengwei
2023-08-09 21:23 ` Peter Xu
2023-08-10 3:25 ` Matthew Wilcox
2023-08-10 8:37 ` David Hildenbrand
2023-08-10 21:48 ` Peter Xu
2023-08-10 21:54 ` Matthew Wilcox
2023-08-10 21:59 ` David Hildenbrand
2023-08-11 15:03 ` Peter Xu
2023-08-11 15:14 ` Zi Yan
2023-08-11 15:17 ` David Hildenbrand
2023-08-10 8:59 ` David Hildenbrand
2023-08-10 10:48 ` Ryan Roberts
2023-08-10 17:15 ` Peter Xu
2023-08-10 17:47 ` David Hildenbrand
2023-08-10 19:02 ` Ryan Roberts
2023-08-10 20:57 ` Peter Xu
2023-08-10 21:48 ` Matthew Wilcox [this message]
2023-08-10 22:27 ` David Hildenbrand
2023-08-11 15:18 ` Peter Xu
2023-08-11 15:32 ` David Hildenbrand
2023-08-11 15:58 ` Peter Xu
2023-08-11 16:08 ` David Hildenbrand
2023-08-11 16:11 ` Zi Yan
2023-08-11 22:18 ` Peter Xu
2023-08-10 22:16 ` David Hildenbrand
2023-08-10 3:24 ` Yin Fengwei
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