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| author | Kan Liang <kan.liang@linux.intel.com> | 2021-06-30 14:08:36 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-07-02 15:58:40 +0200 |
| commit | 8053f2d752e2936f494ede62766a6c9e9fb674f2 (patch) | |
| tree | 6c0d8ea42951cda2d805f1fdf064a6779a65ea3f /Documentation | |
| parent | 0d771caf728436d9ebc2cd1d50bed71685bfe7d8 (diff) | |
| download | linux-stable-8053f2d752e2936f494ede62766a6c9e9fb674f2.tar.gz linux-stable-8053f2d752e2936f494ede62766a6c9e9fb674f2.tar.bz2 linux-stable-8053f2d752e2936f494ede62766a6c9e9fb674f2.zip | |
perf/x86/intel/uncore: Add alias PMU name
A perf PMU may have two PMU names. For example, Intel Sapphire Rapids
server supports the discovery mechanism. Without the platform-specific
support, an uncore PMU is named by a type ID plus a box ID, e.g.,
uncore_type_0_0, because the real name of the uncore PMU cannot be
retrieved from the discovery table. With the platform-specific support
later, perf has the mapping information from a type ID to a specific
uncore unit. Just like the previous platforms, the uncore PMU is named
by the real PMU name, e.g., uncore_cha_0. The user scripts which work
well with the old numeric name may not work anymore.
Add a new attribute "alias" to indicate the old numeric name. The
following userspace perf tool patch will handle both names. The user
scripts should work properly with the updated perf tool.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lore.kernel.org/r/1625087320-194204-13-git-send-email-kan.liang@linux.intel.com
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-event_source-devices-uncore | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-uncore b/Documentation/ABI/testing/sysfs-bus-event_source-devices-uncore new file mode 100644 index 000000000000..b56e8f019fd4 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-uncore @@ -0,0 +1,13 @@ +What: /sys/bus/event_source/devices/uncore_*/alias +Date: June 2021 +KernelVersion: 5.15 +Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> +Description: Read-only. An attribute to describe the alias name of + the uncore PMU if an alias exists on some platforms. + The 'perf(1)' tool should treat both names the same. + They both can be used to access the uncore PMU. + + Example: + + $ cat /sys/devices/uncore_cha_2/alias + uncore_type_0_2 |