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runtime: remove debugging knob to turn off preemption

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It's still easy to turn off, but the builders are happy.
Also document.

R=golang-dev, iant, dvyukov
CC=golang-dev
https://golang.org/cl/12371043
This commit is contained in:
Russ Cox 2013-08-05 16:06:24 -04:00
parent f38ff9e5ea
commit 10ebb84d48
2 changed files with 1 additions and 6 deletions
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1
doc/go1.2.txt
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@ -26,6 +26,7 @@ image/draw: added Quantizer type (CL 11148043).
image/gif: added Encode and EncodeAll (CL 10896043).
io: Copy prioritizes WriterTo over ReaderFrom (CL 9462044).
net: new build tag netgo for building a pure Go net package (CL 7100050).
runtime: preemption of goroutines at function entry (CL 12371043).
sort: new Stable function provides stable sort (CL 9612044).
syscall: implemented Sendfile for Darwin, added Syscall9 for Darwin/amd64 (CL 10980043).
testing: AllocsPerRun is now quantized to an integer (the type is still float64) (CL 9837049).

6
src/pkg/runtime/proc.c
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@ -2275,12 +2275,6 @@ preemptone(P *p)
M *mp;
G *gp;
// Preemption requires more robust traceback routines.
// For now, disable.
// The if(1) silences a compiler warning about the rest of the
// function being unreachable.
if(0) return;
mp = p->m;
if(mp == nil || mp == m)
return;