From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E47B5529403; Thu, 15 Oct 2026 13:53:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792072416; cv=none; b=lLzmgQjBaZEWa6uP+6DDVd1iX7mIngnSYvmv7VIyV12tmFGqbu0aJglG6UyiqSwZeFNU+QL6N2TqE6u2I49oU5YZfQBj/ibZOIQqe3xczFhicECMkp2mf3GTr7OXj7X20qhrIgkDn+1u45PI39dJIeqE7fi9Bk7RNZIlZooarT8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792072416; c=relaxed/simple; bh=X/vs3J/2y5jO5eJnSH7MQH8x1jN+8HzBTs95wf/UWFs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=lJXbHDMJhlkSAEp9EbjLX9mZ8V2gBDh1B7hk4o5+LgGv+23Hs7XHmyQNNYfSsqztgvoRLU5N8del4kr6cOq3bZib1FYN0+FSc4nFJl8mAggvcN347HuZYefwfsa/D7YrD7Nbvh0+ZXf4/ZHuKkt9kbsPjl60VmTIAa4Rj8jRvos= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OnRE3wXa; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OnRE3wXa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91E971F000C4; Thu, 15 Oct 2026 13:53:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792072414; bh=ZWR4amPQ/GR2zsJ6RMsOHCZNfvKrDpnYYA3vUh4QnfI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=OnRE3wXa1FnO6WZFf7oUjHX08tQXKfw7ITTK6i8lrDHZ2lmdMKhLKKTpZO3iImMN1 1x767ig0nCvDC6P3IVw554C4FAGBeHYGH0jkl7Hv9gTYoPo0CPR8bVMJy6NPkNv01y MSpF8kq0LchCpIXBYhjRmfRsjlJmVFXtR19G5gl1gu75T20iIfZ/bJ6D5pxtTC8M0z +SSVDAYbVnCafngS+6OMWW4bmMCfeOS8btTMZd4hlQsteBxFbmE2AqeSywsSUYtBJd A1ENoQiIFU68hRifyjvd/47Peg1VK8qPK5jZuGgyVfe7QElEZmx/Qt4J2jcc+rfkJL qEH9ShHGTEY6w== Message-ID: Date: Thu, 15 Oct 2026 15:53:30 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] mm: page_alloc: make defrag_mode retries follow the promoted order Content-Language: en-US To: Kiryl Shutsemau Cc: Johannes Weiner , Andrew Morton , David Hildenbrand , Harry Yoo , Usama Arif , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Zi Yan , Shakeel Butt , linux-mm@kvack.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@meta.com References: <20261009125503.126202-1-kas@kernel.org> <15a9e03e-c748-4e51-b8cc-583a3610c897@kernel.org> <20261012192834.6934ef85444dee4a60d6d876@linux-foundation.org> <20261014202936.GC371161@cmpxchg.org> <78238103-3a7f-432c-b1df-bd14d7cf4bb1@kernel.org> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/15/26 14:55, Kiryl Shutsemau wrote: > On Thu, Oct 15, 2026 at 09:16:36AM +0200, Vlastimil Babka (SUSE) wrote: >> > And agree 7.4-rc1 with CC stable is fine. Sadly, not sure if anyone >> > but Meta is using the feature right now. >> >> I thought it was there for a long time but it was only added in 2025 :) At >> least the enterprise world is slow to adopt things, AFAICS. > > I was thinking to propose a patch after merge window to make defrag_mode > default. Do you think it is too early? I don't think it is ever going > to be truly stabilized without wider exposure. We can try it, but preferably with arguments (and best, numbers). > We also discussed with Johannes to make a stricter (defrag_mode=2?) mode > that will not give up on fragmentation ever, but OOM instead. Would you use that mode at Meta? That however most likely wouldn't be general purpose enough to become default.