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h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=DHR8IputLfKZiOG/Cr147bz/6e2FKghaMsaanyvD0RL2vM9SoSsKoqC2Hj38TMcDN THEaR03KepS1PrdqWT3oseA5r0gXnPw7zAGqseAuB6yQ/zGmvmNvVtYQD2LJRymCcl rOehn6TnHZzJdMuiPxoPmPw90va1+pRqWssBBilo= Message-ID: Date: Mon, 12 Oct 2026 15:43:37 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC NO CODE] [DISCUSSION] Anti-fragmenting ordered buddy allocator To: Rik van Riel , linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, ryan.roberts@arm.com, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, kasong@tencent.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, hannes@cmpxchg.org, brendan.jackman@linux.dev, ziy@nvidia.com References: <20261011215412.1181172-1-dev.jain@arm.com> <16a9c5ef3fde0b7693e52dac91a2d397526dd99b.camel@surriel.com> Content-Language: en-US From: Dev Jain In-Reply-To: <16a9c5ef3fde0b7693e52dac91a2d397526dd99b.camel@surriel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 18781140008 X-Stat-Signature: z8npzu45kqouk1pef98b3b1dba3ahqt3 X-HE-Tag: 1791800025-969593 X-HE-Meta: U2FsdGVkX18izlBT3vwRg1Ya5Ho7btLoUN9/t384CEu3YDP/vwVKJekWZbvMfO4RXZ3HNNK7nCA1DQR56+5f74lA4gr6ykQRZn8yA9HlhE443KZR9Xe28S8Tq0MVrdN00xhVA19gjqcRjjQl2GmzNuLYDnOmO5mNIo4DJtmQOvYahWxDIW3QFjRane0WvV2aFl2d4ilDoDnCTT7jYmHYz+5jbNN2mXdDChiFd6rgsw0NsmUs5NsuWAoUvHxKq1PH+zOvUgh/8L+cTWuKPuJaBUzKSzOLNRzOy4APjYdRdvFM5+HuSCUGFbyim4G994PjtGsphey+13e3U3vE8o+cLzBTsIZECOKOzkyJLu6KwHmddngkbJbtqBtJnl8ZmNsNr+ImLlk3PCsZchpvJvMzZvKBPGhl2eoP+F3+cY4iuo1ispupmYuMoRXhJ1cLEur8Qr34pp3RPDSBtozkRj7AxdjnstHy3pwtVd17Pqq8aFsyuYZp6XhuBhni4bh9NgZWSTVHpWFYq9D9eaQHl1UUg13HlkhuPoXLnVf3PXMKQnPBpX0Gj7s5upfdOmdkXF09NWiNIcrM1JyaHiOyyXquTLjAtQPvD3kzwRaRI+hHUCoIxMs3ijsSt2Kw30pooX4VREr57XO2AJbGWpCdgv1wbLmL2ee1SN5eoJmn8uSWPJk17uzKQrwS4hBqWvBy+ExAvBT6HQitRYZFVq6BALPz3vnMiNjQmmre/1csxaKI5lz17pskgvCb4L25TVBDRJOAG7eyPwDUhn3KB/BNKziL8m29wQbIgwQaANFovLCjzR36HI4hKR0j726ZBMS8dC0RBOSEbFXoYyKP94qkkfcUPTj2Ng7lMqiM0xsJ+u89MrLR1VbVHz6SWoQjT76ZhI2jAPc1Cu0gDcHVxjdQRQLnDZBeR1eF35EuQWcZ/KoADK+j52PCHZHsRhe/asRkhKK2k44QU09m7zajLQjXkLl Xx/eGqhl /PSla0bZclHgDsGdwTr8CWTfb4VP0hVywd2cORtcovTbt1lKMZ0i4uTcuVGLqcVTXoePt4NaSuh9WQTQpzFYy8NGV3DmhP4zDNnY42466vkJmDpioH0QbL2gn+r2EXtMhBSA6insFL6tiecPtGwYSq05fszP+iVD0iR9y7xuEcKhCWt74takhw9mggeZq6syJCefQwekBfKfRoEDzKGOJm5UEQ5NyKzu0r2iimlsXc+F5G8Wvxpt9cy0hChJb3GYfpgoY1z25kMRZE4KPwuYc7iYWfK2YIj62YEDOESikt5zGSFDwT5Yi0XXUgGY8uNYIUcH3UUl8BfBWR1MOa8v/KMxfDXpAlayOweXhrjoynUyENcQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 12/10/26 3:29 am, Rik van Riel wrote: > On Sun, 2026-10-11 at 21:54 +0000, Dev Jain wrote: >> >> >> Apart from dividing the freelists between migratetypes, little >> attempt >> has been made to change the algorithm > > Could I convince you to take a look at these > patches? Thanks for replying Rik. > > https://lore.kernel.org/all/20261007021250.1665929-1-riel@surriel.com/ Indeed, I had seen these patches and from a cursory look I liked them. I will eventually try to get into page-alloc review. > > My current plan is to first improve the > fragmentation at pageblock level, and then > add some slow path code on top of that > which can steer the allocations by physical > address range, to preserve the potential > for gigablock page lalocation. >