Messages in this thread |  | | Date | Mon, 13 Apr 2026 09:19:47 +0800 | | Subject | Re: [PATCH 0/2] Fix 2 bugs for Intel auto counter reload (ACR) | | From | "Mi, Dapeng" <> |
| |
On 4/13/2026 9:01 AM, Dapeng Mi wrote: > 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.
The unit test patch: https://lore.kernel.org/all/20260413010920.546501-1-dapeng1.mi@linux.intel.com/
Thanks.
> > 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
|  |