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b=N73ygbiKs2BhPqYtlO5jZRWbVaKbo+e+4T+IqZEHKKEzdE9g2qMn3x8qjg/NYZdpK RwOVa+22eRllg+5Y4ES4PXmjeHKwgi9j+fXiPfzAa7Temd8Vgh8CHpgEGbyuX990Sj HzaB7m9tXVgfRD+z9Bvkf7uqmUod3QhA/SL/AKuRI13cwf5NKDEJwQfDnQnE2+6MgP hPK2YB2ddPSiJiIDxLCU3yxjj4dNFLk2qGt/HqPcnPBgN/T01TVf7wqkN0GaozFfJ+ npHKpCkjKuRjZS/cCD9GnWqf1KyMu2kc1yy5pVZkokJh6FkUyQVtDHVtOOXT32Q7eR 4q7LnRP9e7lOg== Date: Mon, 24 Nov 2025 07:30:49 +0200 From: Mike Rapoport To: Pasha Tatashin 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, 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 Subject: Re: [PATCH v7 18/22] selftests/liveupdate: Add kexec test for multiple and empty sessions Message-ID: References: <20251122222351.1059049-1-pasha.tatashin@soleen.com> <20251122222351.1059049-19-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251122222351.1059049-19-pasha.tatashin@soleen.com> X-Rspamd-Queue-Id: 5CCA2120005 X-Stat-Signature: u4mmkmx71fm536oazojbgep6wztzn95j X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1763962275-540981 X-HE-Meta: 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 s89lnPsw CPXNoTYL0o1Fi4ziwefQvlS1/md/F/HcMm4BFf7zzblPDawLRdYi7v5pu5MJxzvJeThSQe4RGFwYpzNM56vNyh6MHm05FWVj+REMFkU8oHq7ruIcDi3Yi+leNgAnjM7QSOn2xYxBsn3cJ8rCndZ/L3UrEJ1hjGoO+GkNt9v2908qG4wfBuCLUGNelNF3ZAAht+pFQuTISmRnHNDopWRXL9FbRKYJMS6FUUlfDBlm4gbKxZclUkeFnhkRxFfSbCI+uYtifqjSsvzTGl4lwAOurYOfEXD4Ko4vVJUAx3XmGCB+9ygt3F6HE0agI7gdtuRptV9G1ZtrmzasEw0Wg1uTDo0qG8Hsk/DKinkJaOji2/oQjmwoGJdCvDeU76WsWSBxhG5jdwwHrPSVqFT6c6Esn22momg== 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 Sat, Nov 22, 2025 at 05:23:45PM -0500, Pasha Tatashin wrote: > Introduce a new kexec-based selftest, luo_kexec_multi_session, to > validate the end-to-end lifecycle of a more complex LUO scenario. > > While the existing luo_kexec_simple test covers the basic end-to-end > lifecycle, it is limited to a single session with one preserved file. > This new test significantly expands coverage by verifying LUO's ability > to handle a mixed workload involving multiple sessions, some of which > are intentionally empty. This ensures that the LUO core correctly > preserves and restores the state of all session types across a reboot. > > The test validates the following sequence: > > Stage 1 (Pre-kexec): > > - Creates two empty test sessions (multi-test-empty-1, > multi-test-empty-2). > - Creates a session with one preserved memfd (multi-test-files-1). > - Creates another session with two preserved memfds > (multi-test-files-2), each containing unique data. > - Creates a state-tracking session to manage the transition to > Stage 2. > - Executes a kexec reboot via the helper script. > > Stage 2 (Post-kexec): > > - Retrieves the state-tracking session to confirm it is in the > post-reboot stage. > - Retrieves all four test sessions (both the empty and non-empty > ones). > - For the non-empty sessions, restores the preserved memfds and > verifies their contents match the original data patterns. > - Finalizes all test sessions and the state session to ensure a clean > teardown and that all associated kernel resources are correctly > released. > > This test provides greater confidence in the robustness of the LUO > framework by validating its behavior in a more realistic, multi-faceted > scenario. > > Signed-off-by: Pasha Tatashin Reviewed-by: Mike Rapoport (Microsoft) > --- > tools/testing/selftests/liveupdate/Makefile | 1 + > .../selftests/liveupdate/luo_multi_session.c | 162 ++++++++++++++++++ > 2 files changed, 163 insertions(+) > create mode 100644 tools/testing/selftests/liveupdate/luo_multi_session.c -- Sincerely yours, Mike.