Mathieu Desnoyers 6e29cb3f61 Linux: Use rseq in sched_getcpu if available ... When available, use the cpu_id field from __rseq_abi on Linux to implement sched_getcpu(). Fall-back on the vgetcpu vDSO if unavailable. Benchmarks: x86-64: Intel E5-2630 v3@2.40GHz, 16-core, hyperthreading glibc sched_getcpu(): 13.7 ns (baseline) glibc sched_getcpu() using rseq: 2.5 ns (speedup: 5.5x) inline load cpuid from __rseq_abi TLS: 0.8 ns (speedup: 17.1x)		2020-07-06 10:21:32 +02:00
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linux	Linux: Use rseq in sched_getcpu if available	2020-07-06 10:21:32 +02:00