Its not immediately apparent from perf tool output that the "amd-uncore" module is not loaded when opening "amd_df" or "amd_l3" events fail or when they do not show up in "perf list" despite using a compatible kernel. Since the primary motivation of the commit [1] that made it possible for this to be loaded as a module was to make development easier, CONFIG_PERF_EVENTS_AMD_UNCORE defaults to 'y' [2].
[1] https://git.kernel.org/torvalds/c/05485745ad482 [2] https://github.com/torvalds/linux/blob/master/arch/x86/events/Kconfig#L40 -- 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/2033416 Title: change CONFIG_PERF_EVENTS_AMD_UNCORE from m to y Status in linux package in Ubuntu: Confirmed Bug description: Ubuntu currently sets CONFIG_PERF_EVENTS_AMD_UNCORE=m for distro kernels. However, unlike plug and play devices, there is no way to load uncore module when user tries to use uncore event. Also, a primary motivation to add module support in uncore driver was to ease development (https://git.kernel.org/torvalds/c/05485745ad482). So, ask ubuntu to switch to CONFIG_PERF_EVENTS_AMD_UNCORE=y. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2033416/+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
