Ports change #26873 to release 3.1 branch.
On OpenVZ virtualized linux, GetCurrentProcessorNumber which uses sched_getcpu()
can return a value greater than the number of processors reported by
sched_getaffinity with CPU_COUNT or sysconf(_SC_NPROCESSORS_ONLN).
For example, taskset -c 2,3 ./MyApp will make CPU_COUNT be 2 but
sched_getcpu() can return 2 or 3, and OpenVZ kernel can make
sysconf(_SC_NPROCESSORS_ONLN) return a limited cpu count but
sched_getcpu() still report the real processor number.
Example of affinity vs current CPU id on OpenVZ:
nproc: 8
nprocOnline: 1
affinity: 1, 0, 0, 0, 0, 0, 0, 0, cpuid: 2
affinity: 1, 0, 0, 0, 0, 0, 0, 0, cpuid: 2
affinity: 1, 0, 0, 0, 0, 0, 0, 0, cpuid: 2
affinity: 1, 0, 0, 0, 0, 0, 0, 0, cpuid: 2
affinity: 1, 0, 0, 0, 0, 0, 0, 0, cpuid: 2
affinity: 1, 0, 0, 0, 0, 0, 0, 0, cpuid: 5
affinity: 1, 0, 0, 0, 0, 0, 0, 0, cpuid: 5
#else // !FEATURE_PAL
if (PAL_HasGetCurrentProcessorNumber())
{
- processorNumber = GetCurrentProcessorNumber();
+ // On linux, GetCurrentProcessorNumber which uses sched_getcpu() can return a value greater than the number
+ // of processors reported by sysconf(_SC_NPROCESSORS_ONLN) when using OpenVZ kernel.
+ processorNumber = GetCurrentProcessorNumber()%NumberOfProcessors;
}
#endif // !FEATURE_PAL
return pRecycledListPerProcessor[processorNumber][memType];