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
next prev parent 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 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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