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 34094521228; Thu, 15 Oct 2026 12:55:31 +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=1792068933; cv=none; b=Xm2ToKX36QVr3Qb1GykmQTyIkPz7UeeQfpYdKMKjkBWY12uBW1Ca4MCLMZGqcZ/jzDb0WpOS8YbjQEQLW+HcIwujzCoQhw2u8OBjE4UBpP1RtiGOgTEwmORr946V3+axzlGIEappy9ajhVS8NqrieVf5cqv4VYNpxaumLvgkh2o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792068933; c=relaxed/simple; bh=7DBp+1phuyFtsy9CKcOsQZlKRPdN0E+MHLNqjGsXSLY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=lS6yV9fg7Ghr4/7VpYzcJjHVs3bP3F8dNKoQy/VtrBX5rp6sohBhMUu325Q7X7qZLmUza5Aovm1s/jHoUMoL+80l1FzdRak2ahHtbC5V4re1GCeLe0G340P0SOekwHRwxFb9Yn7FjIhvhJzmlDC71R33jlyy3I4zPQKlz2BCNc8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jTiix9Xg; 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="jTiix9Xg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B6FF31F000C4; Thu, 15 Oct 2026 12:55:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792068931; bh=clp57vnClQVP+nCheYCqZXPNnTl55WO/xc0j2+TAHUA=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=jTiix9XgOAqINvZR6bBWHZkWxkukxvVWHBigSvYyttYP4WCdUAK3ug6NfdyHF0Xom 6CElzymUseQSn99vTklK0xyJoKCdJuC4jKujZlICBkJwe4umY6OUwcelJmMWNaAPW6 xmfjAGsw+JX8kt0coGIqQ53dWGbaZx/OqBuCfdNVzw3B4wcTlDBy3T27/AMrBOX4GX YoV2lgw8DQkl9/aP3/rzA8p1yOg4nlnL4E3I1B+IMSYTZ0GeM6aotR8vbEtL2fXA0x gquDnP9jiclizoXw09TJTXFFnKduBNvMQE/pEKRLQGV7FV8okTDUV/6gpTRTSL9W9q MoLASdh0CoWUQ== Received: from phl-compute-09.internal (phl-compute-09.internal [10.202.2.49]) by mailfauth.ams.internal (Postfix) with ESMTP id 98E18198004A; Thu, 15 Oct 2026 08:55:26 -0400 (EDT) Received: from phl-frontend-03 ([10.202.2.162]) by phl-compute-09.internal (MEProxy); Thu, 15 Oct 2026 08:55:29 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: dmFkZTENeah5jCyIIexJsBjsOW84TqH2gO5rqiAOue2liPsjxhJZVfheu5qG/L9bNI7vZP O56axSZ1Wv+bTUUudMcDhq8xMBTsA7tgGR/i3ipoz6XNgpJ8FASKYlVpoWG55dt0ppMuMe c9UrZ/xlGXys176GvhcEKtHQ/ed0Rj8PJD+28gZatuRokFMbBB1hCyDumbQerfaqidDsU9 9h31i+E4VRHRE8eXq00ymlPNkbhhutz5ixoC1ggrRIo6Jb9JjFLIHyGaOOqdgQtzmbYv+M VI3K/8qaxFK/Fezlj/6k3b3fWpdpMMzbtWmoN+b3zurRSSR8fiqqa6hkYACGX4hI3WgoPt IirMy5el1faMQe1WSd0dX9YsMwuu5yeN9bde+mswRyZSJKUDjBlnFQSe8AJJ5ywzeDEvEI aGnUbIMhtUFDHoOwLND8Zb08YrUQU21VVlWqXe/A5IcMcYZn0oAujblX+iYCNNyuEj7lQL Cy2ESt1imr0U35qn3Tb/p6kjom1TAS7L/mwHMDO+NDSTb867rANutnqTlXYDz0HMmilFUJ 3CfgqtLOYct/PZnalIpHy+/41L+LY1Bo1MSpO8UFb47vo+Kvjr5KnQjRjNqfd12rWpoWS3 FhunUymkYp9bH229QCAlwcww0dzWLmJ4t4daxRfL2nkJT5ua7SC1q0RtDpOw X-ME-Proxy: Feedback-ID: i10464835:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Thu, 15 Oct 2026 08:55:25 -0400 (EDT) Date: Thu, 15 Oct 2026 13:55:24 +0100 From: Kiryl Shutsemau To: "Vlastimil Babka (SUSE)" 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 Subject: Re: [PATCH v3] mm: page_alloc: make defrag_mode retries follow the promoted order Message-ID: 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <78238103-3a7f-432c-b1df-bd14d7cf4bb1@kernel.org> 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 also discussed with Johannes to make a stricter (defrag_mode=2?) mode that will not give up on fragmentation ever, but OOM instead. -- Kiryl Shutsemau / Kirill A. Shutemov