From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21580C7EE2A for ; Wed, 25 Jun 2025 13:46:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 956F68D0008; Wed, 25 Jun 2025 09:46:51 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 906438D0001; Wed, 25 Jun 2025 09:46:51 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7F5698D0008; Wed, 25 Jun 2025 09:46:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 6DA938D0001 for ; Wed, 25 Jun 2025 09:46:51 -0400 (EDT) Received: from smtpin05.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 06B86140301 for ; Wed, 25 Jun 2025 13:46:51 +0000 (UTC) X-FDA: 83594048622.05.4A208E5 Received: from nyc.source.kernel.org (nyc.source.kernel.org [147.75.193.91]) by imf30.hostedemail.com (Postfix) with ESMTP id 3D3DF8000F for ; Wed, 25 Jun 2025 13:46:49 +0000 (UTC) Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=YHaN0ytp; spf=pass (imf30.hostedemail.com: domain of rppt@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1750859209; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=OXh7sqilq4dOhlkfT3J2JZ2ho+JTkynw9rkcHEPdPWY=; b=PFjEOVH8s5h+MdakHFxOO0rzDtCIW6xUlvRgxxPIx9diSeaboiIl9+sH9UFD01LtCd585B 5lUgbbJJV4vmFakK9wfQAwRH4xuYgw7Rv82p+pIvYjZ95SHsXGr/Ud0OWwXQFLXj5mOi2c 4/NR1JQHDqyHzU2unPSeXmDnpENlAFU= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=YHaN0ytp; spf=pass (imf30.hostedemail.com: domain of rppt@kernel.org designates 147.75.193.91 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1750859209; a=rsa-sha256; cv=none; b=AA7T9mB+qvwXEYNoFeLHX7a1Ka5P4ZjX92m7yj6TQf8ejGj7RnOSIPuQBejxuK1UoJRorP JwfnCYiNJWPwgn3k4yXGKqNfnT4t3NDKsurF4ZUz4IKMMzm0uP1jQUJTrcTIJE/fmJty4E NZCGEwd/xyS7k+eWTdbvrgE+j4N6MM8= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 7292BA52616; Wed, 25 Jun 2025 13:46:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84245C4CEEA; Wed, 25 Jun 2025 13:46:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1750859208; bh=WoZyBxIx6KUGYNeE7NLxFY9awdIAVYhF6Zshu7fnZzo=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=YHaN0ytpeX0jyMaxVJevvy8hUaw+jT5yJK5YTr/g20bSePuOkgfGORPvLhg3yP/Cn vI11yEBN/pZ/Qm7l7yomKc8MtCnWZOa6Li+EyS8oM0Xm9RqMEzXGFo1WKzH/OA2Wgt c42xFApvJJUn2DZjNziRZxwwVROzRjT43MOkRsi3OHfe1O000dL7e6+lAZG0LjNkfg hikrC4xJKHHC5RW0WfqBS+fM65Eb7WdYJ7mYdem9/mr7R9p07d2snQZXpAJySL005B ZQdJ6AQhzJIQP0WRXAxZxAhH0QJWJO06HPU67Zz4QvZ7J2HfpG8feIVKYecU2uXegt Hk77+2WPVspSQ== Date: Wed, 25 Jun 2025 16:46:25 +0300 From: Mike Rapoport To: Pasha Tatashin Cc: Pratyush Yadav , Jason Gunthorpe , jasonmiu@google.com, graf@amazon.com, changyuanl@google.com, dmatlack@google.com, rientjes@google.com, corbet@lwn.net, rdunlap@infradead.org, ilpo.jarvinen@linux.intel.com, kanie@linux.alibaba.com, ojeda@kernel.org, aliceryhl@google.com, masahiroy@kernel.org, akpm@linux-foundation.org, tj@kernel.org, yoann.congal@smile.fr, mmaurer@google.com, roman.gushchin@linux.dev, chenridong@huawei.com, axboe@kernel.dk, mark.rutland@arm.com, jannh@google.com, vincent.guittot@linaro.org, hannes@cmpxchg.org, dan.j.williams@intel.com, david@redhat.com, joel.granados@kernel.org, rostedt@goodmis.org, anna.schumaker@oracle.com, song@kernel.org, zhangguopeng@kylinos.cn, linux@weissschuh.net, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, gregkh@linuxfoundation.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, rafael@kernel.org, dakr@kernel.org, bartosz.golaszewski@linaro.org, cw00.choi@samsung.com, myungjoo.ham@samsung.com, yesanishhere@gmail.com, Jonathan.Cameron@huawei.com, quic_zijuhu@quicinc.com, aleksander.lobakin@intel.com, ira.weiny@intel.com, andriy.shevchenko@linux.intel.com, leon@kernel.org, lukas@wunner.de, bhelgaas@google.com, wagi@kernel.org, djeffery@redhat.com, stuart.w.hayes@gmail.com Subject: Re: [RFC v2 05/16] luo: luo_core: integrate with KHO Message-ID: References: <20250617152357.GB1376515@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Queue-Id: 3D3DF8000F X-Stat-Signature: a8t1jcokqtosiu6w8yeg6pot9shsmrhs X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1750859209-282010 X-HE-Meta: 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 SAW9xg/f mz2KHmnY3ivfo1rrcsj74FvUZG+hSjDpLgAnbVQRLX51m4qmEj8Ennltq8QWe9p75ca5i0qWkgslXkscyoV814VSl7lVtZVbsAu1F4Uo1KmYnKxDVxBVo8uQKuc6pIRVdTs7al9CC4XP8f64gHr6yUo90bv7y0u77MYYZlLwbcXxzOYrIAsN/HUkeoPNGtg3M77qCF36WhCdKX4kZsXtg/N1vBuFnByNxXPfIuLxCNETB584i15aRF23f1gxF1hRSFbZGPrfdj7afL9vwZJ3nftprxdvaa/xJjYQEpheZPXRbPFyiDQEd2+J8ozAMu4VcHb4RIy/XmqBYDSwQ6JHjl85Lzv/CcOhcxOolffqphM8Z+sygJioMkOtvo5RwkA5K4DEfLlSEJHtVmQdDlb73+lmWrgafDynXnODMwu0dkQvZ35l8oD+8wG6N5VARBqHmiFFTDMGogZwx/bs= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jun 23, 2025 at 07:29:09AM -0400, Pasha Tatashin wrote: > On Mon, Jun 23, 2025 at 3:32 AM Mike Rapoport wrote: > > > > On Wed, Jun 18, 2025 at 01:43:18PM -0400, Pasha Tatashin wrote: > > > On Wed, Jun 18, 2025 at 1:00 PM Pasha Tatashin > > > > > > So currently, KHO provides the following two types of internal API: > > > > > > Preserve memory and metadata > > > ========================= > > > kho_preserve_folio() / kho_preserve_phys() > > > kho_unpreserve_folio() / kho_unpreserve_phys() > > > kho_restore_folio() > > > > > > kho_add_subtree() kho_retrieve_subtree() > > > > > > State machine > > > =========== > > > register_kho_notifier() / unregister_kho_notifier() > > > > > > kho_finalize() / kho_abort() > > > > > > We should remove the "State machine", and only keep the "Preserve > > > Memory" API functions. At the time these functions are called, KHO > > > should do the magic of making sure that the memory gets preserved > > > across the reboot. > > > > > > This way, reserve_mem_init() would call: kho_preserve_folio() and > > > kho_add_subtree() during boot, and be done with it. > > For completeness, we also need `void kho_remove_substree(const char > *name);`, currently, all trees are removed during kho_abort(). Let's > rebase and include this patch on top of the next version of LUO, that > we are exchanging off list, and send it together later this week. Oh, here's what I've got: https://git.kernel.org/pub/scm/linux/kernel/git/rppt/linux.git/tree/?h=luo/v1.1 It complies, passes basic KHO test and LUO selftest. > Thanks, > Pasha -- Sincerely yours, Mike.