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Dmitriy Vyukov 30940cfad6 runtime: don't acquirem on malloc fast path
Mallocgc must be atomic wrt GC, but for performance reasons
don't acquirem/releasem on fast path. The code does not have
split stack checks, so it can't be preempted by GC.
Functions like roundup/add are inlined. And onM/racemalloc are nosplit.
Also add debug code that checks these assumptions.

benchmark                     old ns/op     new ns/op     delta
BenchmarkMalloc8              20.5          17.2          -16.10%
BenchmarkMalloc16             29.5          27.0          -8.47%
BenchmarkMallocTypeInfo8      31.5          27.6          -12.38%
BenchmarkMallocTypeInfo16     34.7          30.9          -10.95%

LGTM=khr
R=golang-codereviews, khr
CC=golang-codereviews, rlh, rsc
https://golang.org/cl/123100043
2014-08-18 16:33:39 +04:00
api undo CL 102610045 / 7244ce3ae9db 2014-07-30 09:47:39 +09:00
doc doc: make it point to correct go1.3.1 change history 2014-08-15 08:46:16 +09:00
include liblink, cmd/dist, cmd/5l: introduce %^ and move C_* constants. 2014-08-06 00:31:22 -04:00
lib codereview: do not hit upload_complete on first patch 2014-08-06 16:12:24 -04:00
misc misc/nacl: add debugging instructions 2014-08-15 20:51:44 +04:00
src runtime: don't acquirem on malloc fast path 2014-08-18 16:33:39 +04:00
test cmd/gc: disallow pointer constants 2014-08-15 11:33:31 -07:00
.hgignore lib9: enable on Plan 9 2014-02-13 20:06:41 +01:00
.hgtags tag go1.3.1 2014-08-13 14:54:54 +10:00
AUTHORS A+C: Henning Schmiedehausen (individual CLA) 2014-08-15 15:18:39 -07:00
CONTRIBUTORS A+C: Henning Schmiedehausen (individual CLA) 2014-08-15 15:18:39 -07:00
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README README: Fix installation instructions 2013-11-20 13:47:37 -08:00
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