From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-qk1-f182.google.com (mail-qk1-f182.google.com [209.85.222.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5477B215048 for ; Mon, 3 Mar 2025 15:55:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.222.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741017339; cv=none; b=b637+t8SkwVrfbuag5eqlYMXvtm5GbS8Q91En8MdAlgx1f35QDsMTnZTqf/c9rTLohQpt4x6gJL5KMQ57T2pE1Js046DJk4kR+OT7zbO+hmGJ5GGJ4roY+a+GIL+ol6xda7tipURWeKS454L1X+6LnUU6UhI5sawQRK9oOCKfQE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741017339; c=relaxed/simple; bh=z/KmatcQ+OaKvAP+zAPyuRr4Y7ztXaiC7ZErKwUhdO8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=IwU6Z177M0pOT0iQB6jvvLy6f8O0MHVXK40WWztA02stSpsMFDdDph3aac1Gnb276rOSdcv7LQ0+AGWXmU0nFQL5+0QrXejJ9ixXWk6UDF+zRNr3/PRLkxQfslJ+wTWnW+J5Z25gPYMvDsYNi7hlxsUvQLEkqyudrIsygtqP1Vk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=gourry.net; spf=pass smtp.mailfrom=gourry.net; dkim=pass (2048-bit key) header.d=gourry.net header.i=@gourry.net header.b=eSjbnVQL; arc=none smtp.client-ip=209.85.222.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=gourry.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gourry.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gourry.net header.i=@gourry.net header.b="eSjbnVQL" Received: by mail-qk1-f182.google.com with SMTP id af79cd13be357-7c0818add57so506698485a.3 for ; Mon, 03 Mar 2025 07:55:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gourry.net; s=google; t=1741017336; x=1741622136; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=g0yVVWEkLRZzQAPET4irodYuHGeDUDxcACxGBbqbp38=; b=eSjbnVQLfelyQA+c00jNevkIs4Xndl4LPGS6CDFU4ohRFnJjuoDEe/vYeljEyZMz2Z CwXhfKH4b6zE0gY0ExyqtRVP8b6hP35Hhq9secr0eqbDYd6UqpP2kajr3vtB1/JOlT6X iHXEwCnZch9UcBzH7L2RBGVJauHoAjFNlzF3T9rCveMvXX7wIyLJlMRmzIbzs7XIp6Sh qMpuf9rrkisPex6jMOmkU37tiW2OPmdwxvIs/tgSQaggJSV/dfRiXWnhOEMNmL90Otkg GCZ59kAudsksCcNeEFz/PLRlDymcFrkc93WdcER4lNkD/45nH4Qu5zrhMwys8kZ42qpj mf+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741017336; x=1741622136; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=g0yVVWEkLRZzQAPET4irodYuHGeDUDxcACxGBbqbp38=; b=i5zK0YMfv9RiiX0woxLdYCEhRE3PH+CwNvr3e0j5wv8AaLsV6YSiXMHE2u0bZlu8Wz bAC+vdmUdfYeLgbwOI9gzsFv893QTHenek3ZuvRDDsLS3jIAaYqeLpvIEMKyKaCFz+l9 +ZkZw6lTXsVXkpA61zY/muZShtHN94K2kZAgbBsQzxX3CxBXClkO69QRZusYPGlsmZ2z dgIGAw34hag0NTDvjP7PckUACC33DKwlGVmJvF6e6kxDK2OUGbDprYHndKAQHDr9dFLM MOt7gySs7qvSkTm4iDcTgtD3U5tvlkaDyMURwLBLFnY6ggGkGLvRFn2eRZqj3IPIiiGk NbEQ== X-Forwarded-Encrypted: i=1; AJvYcCX3+gkM/c2/HYnZudKjl5DJKkoATQoKjRzgbpCbXJ0fPrrA31O0eHPn0755nLgq4XEftUdp8qCk7nM=@vger.kernel.org X-Gm-Message-State: AOJu0YzwE099CrLkQuZHvlgokbn3rWt9lzRvlqa+mWM2gmS+FkOKzHu8 1vQBz2Aga0VI3PiO2tmeEmRoFaNTg9RQUAcgGbHS5zphNKBvYIKfjxqbSxjQRXc= X-Gm-Gg: ASbGncsLPIy7E5lZh3+/sC4d3fa57H2T+yyVwlEvvuG6EiG0Tm3H32AYrLyq6k/RBs+ miNdHGEEvDLZccr8HMJIrotM+Hr9cnfAU1XVaoQu9g0LA4TSWfOTgz6sjWUZNUiVsw6BdfgyhtJ oUhohgtNSK93/rKO/krknllNM+BzPGdItRw4l/h4Br4tCS+3u5TPWVg/GYRv06AGc3sJc0SwkJP GX0jCIHV9EKA23mgLbeHeDcUotOQnE+eDxJOizlQjiz8Ds4EhYjjq2g0bQ5BCuSvIwN7CFF1BTN 6Vc6cEs5sTb68UdkRsqJKP1Kuw6LROd2Xc/Iajf0yO6PmIqc6KnZTVGQQxnUAPD6vwWJs8ul9HP uQiPvA7LDrC/m9h6vSS4SVcjtdw8= X-Google-Smtp-Source: AGHT+IFM0tip0IK1EmFEl/X5vlqq96cpWyeJ5x7wplFHlaZ1k9Ww/s40ZReUyRobKusoOZOQPH4L2w== X-Received: by 2002:a05:620a:d88:b0:7c0:a46d:fa87 with SMTP id af79cd13be357-7c39c4c8911mr2016730085a.27.1741017336181; Mon, 03 Mar 2025 07:55:36 -0800 (PST) Received: from gourry-fedora-PF4VCD3F (pool-173-79-56-208.washdc.fios.verizon.net. [173.79.56.208]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7c3b80dfde4sm165557685a.36.2025.03.03.07.55.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Mar 2025 07:55:35 -0800 (PST) Date: Mon, 3 Mar 2025 10:55:33 -0500 From: Gregory Price To: Byungchul Park Cc: "Harry (Hyeonggon) Yoo" <42.hyeyoo@gmail.com>, Honggyu Kim , kernel_team@skhynix.com, Matthew Wilcox , lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org, linux-cxl@vger.kernel.org Subject: Re: [LSF/MM/BPF TOPIC] Restricting or migrating unmovable kernel allocations from slow tier Message-ID: References: <20250207072024.GA48419@system.software.com> <20250210071741.GB39454@system.software.com> <20250225050643.GB38036@system.software.com> Precedence: bulk X-Mailing-List: linux-cxl@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: <20250225050643.GB38036@system.software.com> On Tue, Feb 25, 2025 at 02:06:43PM +0900, Byungchul Park wrote: > On Mon, Feb 10, 2025 at 10:47:58AM -0500, Gregory Price wrote: > > I also think someone should actively ask whether `struct page` can be > > hosted on remote memory without performance loss. I may look into this. > > Could you share the plan or what you have been thinking about it? > > We'd be happy to discuss this topic together, and furthermore, it'd be > even better to work on it together. > Apologies for the late reply, i've been on some R&R. I haven't written up any specific plan for this, but it is *reasonably* simple to test with memmap_on_memory. ~Gregory