From: "David Hildenbrand (Red Hat)" <david@kernel.org>
To: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
Vlastimil Babka <vbabka@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Lameter <cl@gentwo.org>,
David Rientjes <rientjes@google.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
Harry Yoo <harry.yoo@oracle.com>,
linux-mm@kvack.org
Subject: Re: [PATCH v4 02/16] slab: Remove folio references from __ksize()
Date: Thu, 13 Nov 2025 13:32:57 +0100 [thread overview]
Message-ID: <1a591ac9-920f-4de7-94de-54bb5baf2647@kernel.org> (raw)
In-Reply-To: <20251113000932.1589073-3-willy@infradead.org>
On 13.11.25 01:09, Matthew Wilcox (Oracle) wrote:
> In the future, we will separate slab, folio and page from each other
> and calling virt_to_folio() on an address allocated from slab will
> return NULL. Delay the conversion from struct page to struct slab
> until we know we're not dealing with a large kmalloc allocation.
> There's a minor win for large kmalloc allocations as we avoid the
> compound_head() hidden in virt_to_folio().
>
> This deprecates calling ksize() on memory allocated by alloc_pages().
> Today it becomes a warning and support will be removed entirely in
> the future.
>
> Introduce large_kmalloc_size() to abstract how we represent the size
> of a large kmalloc allocation. For now, this is the same as
> page_size(), but it will change with separately allocated memdescs.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> ---
Acked-by: David Hildenbrand (Red Hat) <david@kernel.org>
--
Cheers
David
next prev parent reply other threads:[~2025-11-13 12:33 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-13 0:09 [PATCH v4 00/16] Prepare slab for memdescs Matthew Wilcox (Oracle)
2025-11-13 0:09 ` [PATCH v4 01/16] slab: Reimplement page_slab() Matthew Wilcox (Oracle)
2025-11-13 12:31 ` David Hildenbrand (Red Hat)
2025-11-13 14:02 ` Marco Elver
2025-11-24 2:03 ` Harry Yoo
2025-11-13 0:09 ` [PATCH v4 02/16] slab: Remove folio references from __ksize() Matthew Wilcox (Oracle)
2025-11-13 12:32 ` David Hildenbrand (Red Hat) [this message]
2025-11-24 2:31 ` Harry Yoo
2025-11-24 4:28 ` Matthew Wilcox
2025-11-24 5:18 ` Harry Yoo
2025-11-13 0:09 ` [PATCH v4 03/16] slab: Remove folio references in memcg_slab_post_charge() Matthew Wilcox (Oracle)
2025-11-13 0:09 ` [PATCH v4 04/16] slab: Remove folio references in slab alloc/free Matthew Wilcox (Oracle)
2025-11-13 0:09 ` [PATCH v4 05/16] slab: Remove folio references from ___kmalloc_large_node() Matthew Wilcox (Oracle)
2025-11-13 0:09 ` [PATCH v4 06/16] slab: Remove folio references from free_large_kmalloc() Matthew Wilcox (Oracle)
2025-11-13 0:09 ` [PATCH v4 07/16] slab: Remove folio references from kvfree_rcu_cb() Matthew Wilcox (Oracle)
2025-11-24 5:22 ` Harry Yoo
2025-11-13 0:09 ` [PATCH v4 08/16] slab: Remove folio references from kfree() Matthew Wilcox (Oracle)
2025-11-24 5:39 ` Harry Yoo
2025-11-24 13:53 ` Matthew Wilcox
2025-11-13 0:09 ` [PATCH v4 09/16] slab: Remove folio references from __do_krealloc() Matthew Wilcox (Oracle)
2025-11-24 5:55 ` Harry Yoo
2025-11-13 0:09 ` [PATCH v4 10/16] slab: Remove folio references from build_detached_freelist() Matthew Wilcox (Oracle)
2025-11-24 5:55 ` Harry Yoo
2025-11-13 0:09 ` [PATCH v4 11/16] slab: Remove folio references from kfree_rcu_sheaf() Matthew Wilcox (Oracle)
2025-11-24 5:58 ` Harry Yoo
2025-11-13 0:09 ` [PATCH v4 12/16] slab: Remove folio references from kfree_nolock() Matthew Wilcox (Oracle)
2025-11-24 5:59 ` Harry Yoo
2025-11-13 0:09 ` [PATCH v4 13/16] usercopy: Remove folio references from check_heap_object() Matthew Wilcox (Oracle)
2025-11-24 6:14 ` Harry Yoo
2025-11-24 21:06 ` Kees Cook
2025-11-13 0:09 ` [PATCH v4 14/16] memcg: Convert mem_cgroup_from_obj_folio() to mem_cgroup_from_obj_slab() Matthew Wilcox (Oracle)
2025-11-13 16:14 ` Johannes Weiner
2025-11-13 16:28 ` Vlastimil Babka
2025-11-13 19:42 ` Shakeel Butt
2025-11-13 20:33 ` Matthew Wilcox
2025-11-13 21:54 ` Shakeel Butt
2025-11-13 16:39 ` Matthew Wilcox
2025-11-13 19:16 ` Johannes Weiner
2025-11-13 19:26 ` Vlastimil Babka
2025-11-24 6:44 ` Harry Yoo
2025-11-13 0:09 ` [PATCH v4 15/16] kasan: Remove references to folio in __kasan_mempool_poison_object() Matthew Wilcox (Oracle)
2025-11-24 7:02 ` Harry Yoo
2025-11-13 0:09 ` [PATCH v4 16/16] slab: Remove references to folios from virt_to_slab() Matthew Wilcox (Oracle)
2025-11-24 7:09 ` Harry Yoo
2025-11-24 14:12 ` Matthew Wilcox
2025-11-13 11:28 ` [PATCH v4 00/16] Prepare slab for memdescs Vlastimil Babka
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1a591ac9-920f-4de7-94de-54bb5baf2647@kernel.org \
--to=david@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=cl@gentwo.org \
--cc=harry.yoo@oracle.com \
--cc=linux-mm@kvack.org \
--cc=rientjes@google.com \
--cc=roman.gushchin@linux.dev \
--cc=vbabka@suse.cz \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox