Messages in this thread |  | | From | Dapeng Mi <> | | Subject | [PATCH 0/2] Fix 2 bugs for Intel auto counter reload (ACR) | | Date | Mon, 13 Apr 2026 09:01:55 +0800 |
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This small patch-set fixes 2 issues in auto counter reload support. - The stale ACR mask is not cleared before setting a new one. Patch 1/2 fixes this issue. - PMI is enabled by default for self-reloaded ACR events which causes suspicious NMI warning. Patch 2/2 fixes this issue.
Besides an ACR unit test is added into perf tests which would be posted in a separate session.
Tests:
Run below ACR sampling commands on CWF and NVL (hybrid platform), no issues are found.
a. Non-PEBS ACR sampling
perf record -e '{instructions/period=20000,acr_mask=0x2/u,cycles/period=40000,acr_mask=0x3/u}' ~/test
b. PEBS ACR sampling
perf record -e '{instructions/period=20000,acr_mask=0x2/pu,cycles/period=40000,acr_mask=0x3/u}' ~/test
Dapeng Mi (2): perf/x86/intel: Clear stale ACR mask before updating new mask perf/x86/intel: Disable PMI for self-reloaded ACR events
arch/x86/events/intel/core.c | 20 ++++++++++++++++---- arch/x86/events/perf_event.h | 10 ++++++++++ 2 files changed, 26 insertions(+), 4 deletions(-)
base-commit: 9805ed3c91478b08a586861b874bd8b6a2fed648 -- 2.34.1
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