From: "David Hildenbrand (Red Hat)" <david@kernel.org>
To: Ryan Roberts <ryan.roberts@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Brendan Jackman <jackmanb@google.com>,
Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
Uladzislau Rezki <urezki@gmail.com>,
"Vishal Moola (Oracle)" <vishal.moola@gmail.com>,
Ackerley Tng <ackerleytng@google.com>,
Michael Roth <michael.roth@amd.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 0/2] Free contiguous order-0 pages efficiently
Date: Mon, 5 Jan 2026 17:26:23 +0100 [thread overview]
Message-ID: <7232ac17-8fb4-482b-b820-78d6bd47c4a5@kernel.org> (raw)
In-Reply-To: <20260105161741.3952456-1-ryan.roberts@arm.com>
On 1/5/26 17:17, Ryan Roberts wrote:
> Hi All,
Hi,
>
> A recent change to vmalloc caused some performance benchmark regressions (see
> [1]). I'm attempting to fix that (and at the same time signficantly improve
> beyond the baseline) by freeing a contiguous set of order-0 pages as a batch.
I recently raised the utility of something like that in case we had to
split a large folio in the page cache for guestmemfd, and then want to
punch-hole the whole (original) thing while making sure that the whole
thing ends up back in the buddy.
Freeing individual chunks (e.g., order-0 pages) has the problem that
some pages might get reallocated before merged, consequently fragmenting
the bigger chunk.
--
Cheers
David
next prev parent reply other threads:[~2026-01-05 16:26 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-05 16:17 Ryan Roberts
2026-01-05 16:17 ` [PATCH v1 1/2] mm/page_alloc: Optimize free_contig_range() Ryan Roberts
2026-01-05 17:15 ` Zi Yan
2026-01-05 17:31 ` Ryan Roberts
2026-01-07 3:32 ` Zi Yan
2026-01-05 16:17 ` [PATCH v1 2/2] vmalloc: Optimize vfree Ryan Roberts
2026-01-06 4:36 ` Matthew Wilcox
2026-01-06 9:47 ` David Laight
2026-01-06 11:04 ` Ryan Roberts
2026-01-05 16:26 ` David Hildenbrand (Red Hat) [this message]
2026-01-05 16:36 ` [PATCH v1 0/2] Free contiguous order-0 pages efficiently Zi Yan
2026-01-05 16:41 ` Ryan Roberts
2026-01-06 4:38 ` Matthew Wilcox
2026-01-06 11:10 ` Ryan Roberts
2026-01-06 11:34 ` Uladzislau Rezki
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