From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) (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 8B082FBFA for ; Sun, 21 Jan 2024 21:00:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.178 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705870844; cv=none; b=JrsLYmi+TO1BbKhLoTyZR14GCdl9fsTUfkid7ESE6AiXZ5XFcOeF1hAaQIcEedyyZ49ZvKbI/IWOf6d09StxHcsartvCAjhQ3F7gtOv3DkU+vCUKUoXuXS361MSIAwHwrs+wIdhfnDhFhxQHpIWVmPbgSaOHchdQslLMpjeJF6Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705870844; c=relaxed/simple; bh=zlLzIMc0K+Hs3GtHLMJf/u6sjUkTFUvpoYJN1dC9mdA=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References: MIME-Version:Content-Type; b=TGXmu65wb/rjme3S4lXzHZR5O3at4x1SzSRsKmGvVxaBIPK0fGaxRUxAUTlMwR14w5XjW6d12vg9xqAUbgfEww2gGpIUJfZXeWgr+o1QdHYJ/eCAEkGr7NIRUOXFdyORfS6bcYolNNL7YAr8FeqHmKxF4htKYmQSfmAiayk6RJc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=RDmcjE0i; arc=none smtp.client-ip=209.85.214.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="RDmcjE0i" Received: by mail-pl1-f178.google.com with SMTP id d9443c01a7336-1d72043fa06so105225ad.1 for ; Sun, 21 Jan 2024 13:00:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1705870842; x=1706475642; darn=vger.kernel.org; h=mime-version:references:message-id:in-reply-to:subject:cc:to:from :date:from:to:cc:subject:date:message-id:reply-to; bh=cRZzT2f1JofCE2kB4k8BjPK4SbjBTzmzlRfHn5i6bdY=; b=RDmcjE0itntM4wI6gOXAdwNnKxIs7qzYEiR/bZzE/EobVpaMGxkjEAlnjS4uazePq/ xzoGq+kxJ27WD7FOtHh2QsvSzs06gVCqny10oB6/ESAkYr3fO8TsU2RdoiRFsLUaOyAi wG6cYi+RHABY1g+o88gFSiL+4pyVWwQYqwvVbFX2n2kFqBMwJ28DcIRn7PsnTePT2z/v BAy/QvqrUS/4+GD4Dj+QjOkZG9AkptWLkVoki8UJHwQ1QAa6r+Lm98Omh50dEnbUtb7e J6gadp7bZZuYuohw5NY3fcZbWK7SpCELQog/M7Y76+vBANsvLEWcURHsY4D9HXTjMNZN fl8w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705870842; x=1706475642; h=mime-version:references:message-id:in-reply-to:subject:cc:to:from :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=cRZzT2f1JofCE2kB4k8BjPK4SbjBTzmzlRfHn5i6bdY=; b=k2PYmFrqWF3fG3WHhMmn/cdDFDOLqKakKb9B5TAAoNkwPac0mGjT5oP4G94X+l1Oah M6pTiYQni4p0IHqIqZgychvHNWaadhd9x6+wQvoIC7PGH+m4lEcir8sggPq1GSObcABw I1+0NGfIyHGI9tX3XABWBAaIOyro8NpjhF3m3LqFxy2VKicB2oknfaOtboiWremjSjOf sk+oR6J7YbgTGVRxrPT++O3e6nDF5ExXu++IX8xn7tUwlsJxuNfWfaI+7TrEmztSpb/E 5mtH3TJ/tzTYplz5UTekQ7IH+Ip5WIo5iM2Fl2JGsmVMDXy8ioYmWC4quVN5nVr+8hGJ tE1w== X-Gm-Message-State: AOJu0Yx7GPrX3P076OCcCco9xsUY56us9A1I/iNV8/Vt1ZjMlGu5ugil XEjAVrUUgT6BtcGb+eHzOye/Rpj5jqXN X-Google-Smtp-Source: AGHT+IEXMNPZIS3H5wZZueT2jT74eobFzGlQuvq//fhxcAORa46mOSrn/8EHf0mLkfzQHYyU7j+f5w== X-Received: by 2002:a17:902:ecce:b0:1d6:ffb7:4af9 with SMTP id a14-20020a170902ecce00b001d6ffb74af9mr161181plh.14.1705870841493; Sun, 21 Jan 2024 13:00:41 -0800 (PST) Received: from [2620:0:1008:15:9c9c:e5a:9eed:f21b] ([2620:0:1008:15:9c9c:e5a:9eed:f21b]) by smtp.gmail.com with ESMTPSA id sl7-20020a17090b2e0700b0028b6759d8c1sm8191663pjb.29.2024.01.21.13.00.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 21 Jan 2024 13:00:40 -0800 (PST) Date: Sun, 21 Jan 2024 13:00:40 -0800 (PST) From: David Rientjes To: Matthew Wilcox , Pasha Tatashin , Sourav Panda cc: lsf-pc@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org, linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org, linux-nvme@lists.infradead.org, bpf@vger.kernel.org Subject: Re: [LSF/MM/BPF TOPIC] State Of The Page In-Reply-To: Message-ID: References: Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII On Fri, 19 Jan 2024, Matthew Wilcox wrote: > It's probably worth doing another roundup of where we are on our journey > to separating folios, slabs, pages, etc. Something suitable for people > who aren't MM experts, and don't care about the details of how page > allocation works. I can talk for hours about whatever people want to > hear about but some ideas from me: > > - Overview of how the conversion is going > - Convenience functions for filesystem writers > - What's next? > - What's the difference between &folio->page and page_folio(folio, 0)? > - What are we going to do about bio_vecs? > - How does all of this work with kmap()? > > I'm sure people would like to suggest other questions they have that > aren't adequately answered already and might be of interest to a wider > audience. > Thanks for proposing this again, Matthew, I'd definitely like to be involved in the discussion as I think a couple of my colleagues, cc'd, would has well. Memory efficiency is a top priority for 2024 and, thus, getting on a pathway toward reducing the overhead of struct page is very important for our hosts that are not using large amounts of 1GB hugetlb. I've seen your other thread regarding how the page allocator can be enlightened for memdesc, so I'm hoping that can either be covered in this topic or a separate topic. Especially important for us would be the division of work so that we can parallelize development as much as possible for things like memdesc. If there are any areas that just haven't been investigated yet but we *know* we'll need to address to get to the new world of memdesc, I think we'd love to discuss that.