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The illumos-specific _SC_CPUID_MAX is the largest CPU ID in the system. This was mapped to _SC_NPROCESSORS_CONF, which is the total number of CPUs recognized by the kernel. If CPU IDs are contiguous, as is the case on amd64 and arm64, this value is one greater than the maximum ID. As a result, when consuming per-CPU dtrace buffers, libdtrace tries to fetch from a non-existent CPU. This is mostly harmless in practice, but still wrong. As we don't have a sysconf value for the maximum CPU ID, add a wrapper which fetches it using the kern.smp.maxid sysctl. MFC after: 2 weeks Sponsored by: Innovate UK Differential Revision: https://reviews.freebsd.org/D49243 (cherry picked from commit 9a30c8d347bf9aaa89277b6e5a275f737be8edce) |
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