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Tue, 06 Jan 2026 03:34:31 -0800 (PST) Received: from pc636 ([2001:9b1:d5a0:a500::800]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-59b65d5dc74sm517522e87.54.2026.01.06.03.34.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jan 2026 03:34:31 -0800 (PST) From: Uladzislau Rezki X-Google-Original-From: Uladzislau Rezki Date: Tue, 6 Jan 2026 12:34:29 +0100 To: Matthew Wilcox Cc: Ryan Roberts , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Uladzislau Rezki , "Vishal Moola (Oracle)" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v1 0/2] Free contiguous order-0 pages efficiently Message-ID: References: <20260105161741.3952456-1-ryan.roberts@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 2E93440014 X-Stat-Signature: p81nphi6u1kiwmkcwzdw973dh9rnzuum X-HE-Tag: 1767699273-263210 X-HE-Meta: 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 RyEn9DHh 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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