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[67.164.59.41]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-249066e042asm137861455ad.146.2025.09.02.09.25.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Sep 2025 09:25:48 -0700 (PDT) Date: Tue, 2 Sep 2025 09:25:46 -0700 From: "Vishal Moola (Oracle)" To: Wei Yang Cc: akpm@linux-foundation.org, vbabka@suse.cz, hannes@cmpxchg.org, ziy@nvidia.com, linux-mm@kvack.org, David Hildenbrand Subject: Re: [Patch v2] mm/page_alloc: find_large_buddy() from start_pfn aligned order Message-ID: References: <20250902025807.11467-1-richard.weiyang@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250902025807.11467-1-richard.weiyang@gmail.com> X-Stat-Signature: dzni5jncynnmfd8mmitzquf7t9dwiwr3 X-Rspam-User: X-Rspamd-Queue-Id: AAD1614000C X-Rspamd-Server: rspam05 X-HE-Tag: 1756830350-163859 X-HE-Meta: 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 kpZUgzSD 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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, Sep 02, 2025 at 02:58:07AM +0000, Wei Yang wrote: > We iterate pfn from order 0 to MAX_PAGE_ORDER aligned to find large buddy. > While if the order is less than start_pfn aligned order, we would get the > same pfn and do the same check again. > > Iterate from start_pfn aligned order to reduce duplicated work. > > Link: https://lkml.kernel.org/r/20250828091618.7869-1-richard.weiyang@gmail.com > Signed-off-by: Wei Yang > Cc: Johannes Weiner > Cc: Zi Yan > Cc: Vlastimil Babka > Cc: David Hildenbrand > Signed-off-by: Andrew Morton > Reviewed-by: Zi Yan Reviewed-by: Vishal Moola (Oracle)