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Rick Hudson authored
The routine mallocgc retrieves objects from freelists. Prefetch the object that will be returned in the next call to mallocgc. Experiments indicate that this produces a 1% improvement when using prefetchnta and less when using prefetcht0, prefetcht1, or prefetcht2. Benchmark numbers indicate a 1% improvement over no prefetch, much less over prefetcht0, prefetcht1, and prefetcht2. These numbers were for the garbage benchmark with MAXPROCS=4 no prefetch >> 5.96 / 5.77 / 5.89 prefetcht0(uintptr(v.ptr().next)) >> 5.88 / 6.17 / 5.84 prefetcht1(uintptr(v.ptr().next)) >> 5.88 / 5.89 / 5.91 prefetcht2(uintptr(v.ptr().next)) >> 5.87 / 6.47 / 5.92 prefetchnta(uintptr(v.ptr().next)) >> 5.72 / 5.84 / 5.85 Change-Id: I54e07172081cccb097d5b5ce8789d74daa055ed9 Reviewed-on: https://go-review.googlesource.com/5350Reviewed-by: Dmitry Vyukov <dvyukov@google.com> Reviewed-by: Austin Clements <austin@google.com>
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