linux-kernel - Re: [PATCH v1 0/2] Free contiguous order-0 pages efficiently

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Message-ID: <aVzzRU-VkHpJlpps@pc636>
Date: Tue, 6 Jan 2026 12:34:29 +0100
From: Uladzislau Rezki <urezki@...il.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Ryan Roberts <ryan.roberts@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Michal Hocko <mhocko@...e.com>,
	Brendan Jackman <jackmanb@...gle.com>,
	Johannes Weiner <hannes@...xchg.org>, Zi Yan <ziy@...dia.com>,
	Uladzislau Rezki <urezki@...il.com>,
	"Vishal Moola (Oracle)" <vishal.moola@...il.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/2] Free contiguous order-0 pages efficiently

On Tue, Jan 06, 2026 at 04:38:39AM +0000, Matthew Wilcox wrote:
> On Mon, Jan 05, 2026 at 04:17:36PM +0000, Ryan Roberts wrote:
> > Hi All,
> > 
> > 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
> 
> Unfortunately, there was no [1] ... I'm not sure this benchmark is
> really doing anything representative.  But the performance improvement
> is certainly welcome; we'd deferred work on that for later.
>
When discussed the high-order preference allocation patch, i noticed
a difference in behaviour right away. Further investigation showed that
the free path also needs to be improved to fully benefit from that change.

I can document the test-cases in the test_vmalloc.c if it helps. Also
i can add more focused benchmarks for allocation and free paths.

--
Uladzislau Rezki