This bug is awaiting verification that the linux- oracle-5.15/5.15.0-1055.61~20.04.1 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-focal-linux- oracle-5.15' to 'verification-done-focal-linux-oracle-5.15'. If the problem still exists, change the tag 'verification-needed-focal-linux- oracle-5.15' to 'verification-failed-focal-linux-oracle-5.15'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: kernel-spammed-focal-linux-oracle-5.15-v2 verification-needed-focal-linux-oracle-5.15 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2053069 Title: performance: address_space: add padding for i_map and i_mmap_rwsem to mitigate a false sharing Status in linux package in Ubuntu: Invalid Status in linux source package in Jammy: Fix Released Bug description: This is a public version of https://bugs.launchpad.net/bugs/2034983 [Description] When running UnixBench/shell1&shell8&exelc cases, we observed high false sharing for accessing i_mmap against i_mmap_rwsem. The patch places the i_mmap and i_mmap_rwsem in separate cache lines to avoid this false sharing problem. [Hardware Information] Architecture: Intel / AMD (x86_64) Platform(s): DNP Date HW is expected at Canonical: Component(s): Performance and Scalability [Software Information] Target Version: 23.10 Target Kernel: TBD Commit IDs: aee79d4e5271 fs/address_space: add alignment padding for i_map and i_mmap_rwsem to mitigate a false sharing. External Links: [Business Justification] [Testing guidance] [External ID] OSVE-5159 Here's the commit ID: aee79d4e5271cee4ffa89ed830189929a6272eb8 https://github.com/torvalds/linux/commit/aee79d4e5271cee4ffa89ed830189929a6272eb8 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2053069/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
