Messages in this thread | | | From | Jim Mattson <> | Date | Wed, 10 Mar 2021 07:35:58 -0800 | Subject | Re: [PATCH] perf/x86/kvm: Fix inverted pebs_no_isolation check |
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On Wed, Mar 10, 2021 at 7:24 AM Andi Kleen <ak@linux.intel.com> wrote: > > The pebs_no_isolation optimization check is inverted. We want to disable > PEBS isolation when the microcode is at least the revision in the table, > not for older microcode. So remove the extra !. The original code was correct because of the double negative. A "good" CPU _has_ PEBS isolation. It's bad to have pebs_no_isolation.
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