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AJvYcCVJfh4uOf2AiWxCxDxy7OSzPxj6EX2+U4J7Z7xmfTi2gGjAyVMzauuYmaaQuV54e3FrC7AUhatIpw==@kvack.org X-Gm-Message-State: AOJu0Yybro/yzZ7YJ0AP3C7fs0cH0SAGHm9SBslXn/6Jr8P85ZPDK0ul eDk+kryu4Il5iI/o0QcX0q1gjwt8ZCxRO4IArdwQYL/+v4yASwkJ/fbianJ+Wtub+vIvyHwju9D WmXmbBVo2DNvMRD34oAaA4NtvxJow8ZRZchu1yHnAgA== X-Gm-Gg: ASbGncuY8Gza2z0LgcBvSBLremiCraD3bfZl3FY/Mp8xKZ3h66Od33lpDOAm0eBQzve a9ucRDqK/W20xRkAf7o+xoDgvAnY9u59b+gIS34ZY/pPsN7RQYDGG7pY/reXKP20j0WwZG3lbQV 8d/mQIcFcq3z/dNnucKyZQ6WP/mE9A8ZkjewC4PZ4tGDSCk+FB1ByGNov6l4c/0X1IBktCbDvh2 MpxRiA3HwXGR1HSxgBl/z0y9YbxIHD+3Vj0zO/jj4RGvkWxFGpnpB32NQ== X-Google-Smtp-Source: AGHT+IHnCxJ5sXULWNZ4xyt6eOXGzcL5bRRpxTbpBkagcIsWqapM9iv+G712dgCOMjYDLl8hNWljgh4gZ1/4nXWnvWg= X-Received: by 2002:a05:6402:280d:b0:641:270:2c8a with SMTP id 4fb4d7f45d1cf-64334ce2bf2mr656038a12.14.1762980462571; Wed, 12 Nov 2025 12:47:42 -0800 (PST) MIME-Version: 1.0 References: <20251107210526.257742-1-pasha.tatashin@soleen.com> <20251107210526.257742-7-pasha.tatashin@soleen.com> In-Reply-To: From: Pasha Tatashin Date: Wed, 12 Nov 2025 15:47:05 -0500 X-Gm-Features: AWmQ_bkVh8Sk3xM0csiNTGOKzpW_RilqarlOG4vqEffeEKya7lO37kZmCW2_pO8 Message-ID: Subject: Re: [PATCH v5 06/22] liveupdate: luo_session: add sessions support To: Mike Rapoport Cc: pratyush@kernel.org, jasonmiu@google.com, graf@amazon.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, ptyadav@amazon.de, lennart@poettering.net, brauner@kernel.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, saeedm@nvidia.com, ajayachandra@nvidia.com, jgg@nvidia.com, parav@nvidia.com, leonro@nvidia.com, witu@nvidia.com, hughd@google.com, skhawaja@google.com, chrisl@kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 3784EA0009 X-Stat-Signature: 4d7cub1s86mb7ptowwoyzi6qgsa6q5qg X-HE-Tag: 1762980464-562466 X-HE-Meta: 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 yjMAXpCk YhXwMEt1KG/h5aKTO/RW3Tv0EmaVtaRaZzCcQp9xh6vqmqGATz3Xa5Cf3Z2xB+aiUq9LyMdMfe4VuMqujWAsoiRcBCOgo4b+lItbPsmnlnF5kqp4p+2+PGZCGLW8M1oUHW1akZuXN0BGLgE55d84mWZ1IalyCm8SW/VosQpP0sxWemo6JUzXLnU5vvAH6g6WXk1ZQrp50nUtuFy9Wm9/4hcRGB9NJShMjaMtsV6o4EwScRGQLcf9wyNlt7kdPrbSwRadzoxLfRhJzo92fK9ni2/n1o4+46F0+n2e6eaHHgCyzosTNcdLcdpp+FGgnwWyBC32O3r9OgzUTXsA+HxoS+u/Oi6KYH+566qkW 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 Wed, Nov 12, 2025 at 3:39=E2=80=AFPM Mike Rapoport wro= te: > > On Fri, Nov 07, 2025 at 04:03:04PM -0500, Pasha Tatashin wrote: > > Introduce concept of "Live Update Sessions" within the LUO framework. > > LUO sessions provide a mechanism to group and manage `struct file *` > > instances (representing file descriptors) that need to be preserved > > across a kexec-based live update. > > > > Each session is identified by a unique name and acts as a container > > for file objects whose state is critical to a userspace workload, such > > as a virtual machine or a high-performance database, aiming to maintain > > their functionality across a kernel transition. > > > > This groundwork establishes the framework for preserving file-backed > > state across kernel updates, with the actual file data preservation > > mechanisms to be implemented in subsequent patches. > > > > Signed-off-by: Pasha Tatashin > > --- > > include/linux/liveupdate/abi/luo.h | 81 ++++++ > > include/uapi/linux/liveupdate.h | 3 + > > kernel/liveupdate/Makefile | 3 +- > > kernel/liveupdate/luo_core.c | 9 + > > kernel/liveupdate/luo_internal.h | 39 +++ > > kernel/liveupdate/luo_session.c | 405 +++++++++++++++++++++++++++++ > > 6 files changed, 539 insertions(+), 1 deletion(-) > > create mode 100644 kernel/liveupdate/luo_session.c > > > > diff --git a/include/linux/liveupdate/abi/luo.h b/include/linux/liveupd= ate/abi/luo.h > > index 9483a294287f..37b9fecef3f7 100644 > > --- a/include/linux/liveupdate/abi/luo.h > > +++ b/include/linux/liveupdate/abi/luo.h > > @@ -28,6 +28,11 @@ > > * / { > > * compatible =3D "luo-v1"; > > * liveupdate-number =3D <...>; > > + * > > + * luo-session { > > + * compatible =3D "luo-session-v1"; > > + * luo-session-head =3D ; > > 'head' reads to me as list head rather than a header. I'd use 'hdr' for t= he > latter. Or just use the full name: "header" ? It is not too long as well. Pasha > > -- > Sincerely yours, > Mike.