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b=s2dxYeVoaZOazfHyFr5HmEW7yEF2kyENZxJLO/bkIVU+4YswTAsFte42VtYXPpwAp MtiXJVjzK3d+sKMWBdG2ylnIFkyg2p3nCbnuoHEAd+Hl9tLlsD1bnHV8FWqBp6OPoV 9WDfFCEaxEkER7apciERu/epb8TpNRMc5JU8Pp7i33WFUAClkZpW54tXiz4HDyFsC0 CpaESd73RCAGj4mgv0psl0EnT+vo+NZWn/bsnaQS9hAvuI+kqkCC7QTWGMJrIrozan brMnso4HosoEQucy47O1jFex/dzPDgzd0Zg/QeTqyxC3z3lL89e0+EYCIsqIiF9LIi VlOFgH3C1ubzg== Date: Sun, 17 May 2026 20:33:05 +0300 From: Mike Rapoport To: Pasha Tatashin Cc: linux-kselftest@vger.kernel.org, shuah@kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, skhan@linuxfoundation.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, corbet@lwn.net, dmatlack@google.com, kexec@lists.infradead.org, pratyush@kernel.org, skhawaja@google.com, graf@amazon.com Subject: Re: [PATCH v2 06/10] liveupdate: Remove limit on the number of sessions Message-ID: References: <20260514222628.931312-1-pasha.tatashin@soleen.com> <20260514222628.931312-7-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260514222628.931312-7-pasha.tatashin@soleen.com> X-Rspam-User: X-Rspamd-Queue-Id: 59791180002 X-Rspamd-Server: rspam04 X-Stat-Signature: uzfh6ajygt8dxnpdem5is96gd91ucs1s X-HE-Tag: 1779039194-55170 X-HE-Meta: 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 zRxjun5H jaUP+5MZYu0XqiO7oo7Sjx3K6Hrl5MmO8kFm9iZ7597CH0SIPHYdX91WhdA6YV7yeUnel7n5yUDCIH1ZBAsdV2BeMgxlaWP4mvB4sHuWi9/6maHrSAvA17ABGwl/8unWR76dY6Vrd2RQ0akd/grSYwSSs1FqsN56uBdAzlN3hp0Hl70dUgEK3prDxqwQJMMDp98yX80OMYkp2V3xLHVVm7er0AoHPHv1pcd/CofBI8NqSy/rQDNQ7WBNOzqa5qhVmTTJxJVH+BquUJBFV7kdiW1lZBc5dzvx8Sl5R6d8rNCyQ+RA= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, May 14, 2026 at 10:26:24PM +0000, Pasha Tatashin wrote: > Currently, the number of LUO sessions is limited by a fixed number of > pre-allocated pages for serialization (16 pages, allowing for ~819 > sessions). > > This limitation is problematic if LUO is used to support things such as > systemd file descriptor store, and would be used not just as VM memory > but to save other states on the machine. > > Remove this limit by transitioning to a linked-block approach for > session metadata serialization. Instead of a single contiguous block, > session metadata is now stored in a chain of 16-page blocks. Each block > starts with a header containing the physical address of the next block > and the number of session entries in the current block. > > Signed-off-by: Pasha Tatashin Acked-by: Mike Rapoport (Microsoft) > --- > include/linux/kho/abi/luo.h | 24 +------- > kernel/liveupdate/luo_session.c | 105 +++++++++++++++----------------- > 2 files changed, 50 insertions(+), 79 deletions(-) -- Sincerely yours, Mike.