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From: Jason Gunthorpe <jgg@nvidia.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>, linux-mm@kvack.org
Subject: Re: Where to put page->memdesc initially
Date: Tue, 2 Sep 2025 18:15:14 -0300	[thread overview]
Message-ID: <20250902211514.GQ186519@nvidia.com> (raw)
In-Reply-To: <aLdcPeb8zrfDwd2p@casper.infradead.org>

On Tue, Sep 02, 2025 at 10:06:05PM +0100, Matthew Wilcox wrote:

> I'm concerned by things like compaction that are executing
> asynchronously and might see a page mid-transition.  Or something like
> GUP or lockless pagecache lookup that might get a stale page
> pointer.

At least GUP fast obtains a page refcount before touching the rest of
struct page, so I think it can't see those kinds of races since the
page shouldn't be transitioning with a non-zero refcount?

Jason


  reply	other threads:[~2025-09-02 21:15 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-02 19:03 Where to put page->memdesc initially Matthew Wilcox
2025-09-02 20:08 ` Jason Gunthorpe
2025-09-02 20:09 ` David Hildenbrand
2025-09-02 21:06   ` Matthew Wilcox
2025-09-02 21:15     ` Jason Gunthorpe [this message]
2025-09-02 23:24       ` Matthew Wilcox
2025-09-02 23:57         ` Jason Gunthorpe
2025-09-03  4:46           ` Matthew Wilcox
2025-09-03  9:38             ` David Hildenbrand
2025-09-03 12:28             ` Jason Gunthorpe
2025-09-03 12:43             ` Jason Gunthorpe
2025-09-03  9:33     ` David Hildenbrand

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