Russ Cox ba134539c5 runtime: faster entersyscall/exitsyscall ... Replace cas with xadd in scheduler. Suggested by Dmitriy in last code review. Verified with Promela model. When there's actual contention for the atomic word, this avoids the looping that compare-and-swap requires. benchmark old ns/op new ns/op delta runtime_test.BenchmarkSyscall 32 26 -17.08% runtime_test.BenchmarkSyscall-2 155 59 -61.81% runtime_test.BenchmarkSyscall-3 112 52 -52.95% runtime_test.BenchmarkSyscall-4 94 48 -48.57% runtime_test.BenchmarkSyscallWork 871 872 +0.11% runtime_test.BenchmarkSyscallWork-2 481 477 -0.83% runtime_test.BenchmarkSyscallWork-3 338 335 -0.89% runtime_test.BenchmarkSyscallWork-4 263 256 -2.66% R=golang-dev, iant CC=golang-dev https://golang.org/cl/4800047		2011-07-23 12:22:55 -04:00
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cmd	ld: fixes .bss for ldpe	2011-07-23 12:21:13 -04:00
lib9	lib9: use $PWD in getwd	2011-07-22 21:21:17 -04:00
libbio	…
libmach	runtime/cgo: check for errors from pthread_create	2011-06-28 12:04:50 -04:00
pkg	runtime: faster entersyscall/exitsyscall	2011-07-23 12:22:55 -04:00
Make.ccmd	build: explain $PWD use	2011-06-22 17:00:46 -04:00
Make.clib	build: explain $PWD use	2011-06-22 17:00:46 -04:00
Make.cmd	…
Make.common	…
Make.inc	…
Make.pkg	…
all-qemu.bash	all-qemu.bash: cannot test go/build	2011-06-20 17:44:36 -04:00
all.bash	…
clean.bash	…
env.bash	build: use correct list of required programs	2011-06-27 14:30:02 -04:00
make.bash	…
quietgcc.bash	…
run.bash	exp/eval, exp/ogle: remove packages eval and ogle	2011-07-13 09:40:53 -07:00
sudo.bash	…
version.bash	build: make version.bash aware of branches	2011-06-30 15:39:00 +10:00