runtime: faster select
Make selectsend() accept pointer to the element, it makes it possible to make Scase fixed-size and allocate/free Select, all Scase's and all SudoG at once. As a consequence SudoG freelist die out. benchmark old,ns/op new,ns/op BenchmarkSelectUncontended 1080 558 BenchmarkSelectUncontended-2 675 264 BenchmarkSelectUncontended-4 459 205 BenchmarkSelectContended 1086 560 BenchmarkSelectContended-2 1775 1672 BenchmarkSelectContended-4 2668 2149 (on Intel Q6600, 4 cores, 2.4GHz) benchmark old ns/op new ns/op delta BenchmarkSelectUncontended 517.00 326.00 -36.94% BenchmarkSelectUncontended-2 281.00 166.00 -40.93% BenchmarkSelectUncontended-4 250.00 83.10 -66.76% BenchmarkSelectUncontended-8 107.00 47.40 -55.70% BenchmarkSelectUncontended-16 67.80 41.30 -39.09% BenchmarkSelectContended 513.00 325.00 -36.65% BenchmarkSelectContended-2 699.00 628.00 -10.16% BenchmarkSelectContended-4 1085.00 1092.00 +0.65% BenchmarkSelectContended-8 3253.00 2477.00 -23.85% BenchmarkSelectContended-16 5313.00 5116.00 -3.71% (on Intel E5620, 8 HT cores, 2.4 GHz) R=rsc, ken CC=golang-dev https://golang.org/cl/4811041
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