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Fri, 25 Apr 2025 19:21:45 +0200 (CEST) Date: Fri, 25 Apr 2025 19:21:45 +0200 From: Lukas Wunner To: Pasha Tatashin Cc: Jason Gunthorpe , changyuanl@google.com, graf@amazon.com, rppt@kernel.org, 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, bhelgaas@google.com, wagi@kernel.org, djeffery@redhat.com, stuart.w.hayes@gmail.com, jgowans@amazon.com, Pratyush Yadav Subject: Re: [RFC v1 1/3] luo: Live Update Orchestrator Message-ID: References: <20250320024011.2995837-1-pasha.tatashin@soleen.com> <20250320024011.2995837-2-pasha.tatashin@soleen.com> <20250320144338.GW9311@nvidia.com> <20250320192601.GG206770@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 3C6C91C000D X-Stat-Signature: 9o4xi3xmjts7mojqxohhf7bwui39698o X-Rspam-User: X-HE-Tag: 1745601707-399523 X-HE-Meta: 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 WO6PkIHX arcYD53TZMhgKk0sVq1NSXW1ZXhyMBg5Kf6YLeBX+j2kl+NbVnmyM3qiNfK+/zQIFxJm9 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 Thu, Mar 27, 2025 at 03:29:18PM -0400, Pasha Tatashin wrote: > 3. Dependency Management: The viability of preserving a specific > resource (file, device) will be checked when it initially requests > participation. > However, the actual dependencies will only be pulled and the final > ordered list assembled during the prepare phase. This avoids the churn > of repeatedly adding/removing dependencies as individual components > register. [...] > The overall preservation sequence involve processing these handles in > a specific order: > > Preserved File Descriptors (e.g., memfd, kvmfd, iommufd, vfiofd) > Preserved Devices (ordered appropriately, leaves-to-root) ^^^^^^^^^^^^^^ Device dependencies are no longer strictly hierarchical since the introduction of device links. However devices_kset->list already has the correct order, so if you follow that you should be fine. Just be careful not to assume it's always in hierarchical order. Thanks, Lukas