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: Wed, 3 Sep 2025 09:43:14 -0300 [thread overview]
Message-ID: <20250903124314.GF470103@nvidia.com> (raw)
In-Reply-To: <aLfIEKLqpe_xB7mW@casper.infradead.org>
On Wed, Sep 03, 2025 at 05:46:08AM +0100, Matthew Wilcox wrote:
> Once we switch to memdescs for these things, they no longer need a
> refcount field. By the end of Page2025, plain pages have a refcount,
> but folios/slabs/ptdesc/etc set the page->_refcount to 0.
Reading this again, I didn't quite get this till now. Maybe it is
worth adding this detail to the wikki.
In this case, what are "plain pages"?
One I can think of is naked calls to alloc_page*(), which I see often
used in place of kmalloc(PAGE_SIZE), do you imagine a project to
favour kmalloc instead?
Jason
next prev parent reply other threads:[~2025-09-03 12:43 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
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 [this message]
2025-09-03 9:33 ` David Hildenbrand
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