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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
14 lines
454 B
Plaintext
14 lines
454 B
Plaintext
What: /sys/bus/event_source/devices/uncore_*/alias
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Date: June 2021
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KernelVersion: 5.15
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Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
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Description: Read-only. An attribute to describe the alias name of
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the uncore PMU if an alias exists on some platforms.
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The 'perf(1)' tool should treat both names the same.
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They both can be used to access the uncore PMU.
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Example:
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$ cat /sys/devices/uncore_cha_2/alias
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uncore_type_0_2
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