** Summary changed:
- change CONFIG_PERF_EVENTS_AMD_UNCORE from m to y
+ [SRU] change CONFIG_PERF_EVENTS_AMD_UNCORE from m to y
** Also affects: linux (Ubuntu Noble)
Importance: Undecided
Status: Confirmed
** Also affects: linux (Ubuntu Mantic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Mantic)
Status: New => Confirmed
** Description changed:
- Ubuntu currently sets CONFIG_PERF_EVENTS_AMD_UNCORE=m for distro
- kernels.
+ [Impact]
+ 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.
+ 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
+
+ [Fix]
+
+ Change kernel config to CONFIG_PERF_EVENTS_AMD_UNCORE=y
+
+ [Test case]
+
+ (How can this change be tested/verified?)
+
+ [Where problems may occur]
+
+ (What side effects or regressions could this change create?)
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https://bugs.launchpad.net/bugs/2033416
Title:
[SRU] change CONFIG_PERF_EVENTS_AMD_UNCORE from m to y
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Mantic:
Confirmed
Status in linux source package in Noble:
Confirmed
Bug description:
[Impact]
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).
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
[Fix]
Change kernel config to CONFIG_PERF_EVENTS_AMD_UNCORE=y
[Test case]
(How can this change be tested/verified?)
[Where problems may occur]
(What side effects or regressions could this change create?)
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