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runtime: preempt goroutines for GC

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The last patch for preemptive scheduler,
with this change stoptheworld issues preemption
requests every 100us.
Update #543.

R=golang-dev, daniel.morsing, rsc
CC=golang-dev
https://golang.org/cl/10264044
This commit is contained in:
Dmitriy Vyukov 2013-06-28 17:52:17 +04:00
parent ab1270bcfc
commit 1e112cd59f
5 changed files with 71 additions and 15 deletions
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24
src/pkg/runtime/stack.c
View file

@ -211,7 +211,10 @@ runtime·newstack(void)
gp->status = Gwaiting;
gp->waitreason = "stack split";
reflectcall = framesize==1;
if(reflectcall)
framesize = 0;
// For reflectcall the context already points to beginning of reflect·call.
if(!reflectcall)
runtime·rewindmorestack(&gp->sched);
@ -238,9 +241,24 @@ runtime·newstack(void)
runtime·throw("runtime: stack split argsize");
}
reflectcall = framesize==1;
if(reflectcall)
framesize = 0;
if(gp->stackguard0 == StackPreempt) {
if(gp == m->g0)
runtime·throw("runtime: preempt g0");
if(oldstatus == Grunning && (m->p == nil || m->p->status != Prunning))
runtime·throw("runtime: g is running but p is not");
// Be conservative about where we preempt.
// We are interested in preempting user Go code, not runtime code.
if(oldstatus != Grunning || m->locks || m->mallocing || m->gcing) {
// Let the goroutine keep running for now.
// TODO(dvyukov): remember but delay the preemption.
gp->stackguard0 = gp->stackguard;
gp->status = oldstatus;
runtime·gogo(&gp->sched); // never return
}
// Act like goroutine called runtime.Gosched.
gp->status = oldstatus;
runtime·gosched0(gp); // never return
}
if(reflectcall && m->morebuf.sp - sizeof(Stktop) - argsize - 32 > gp->stackguard) {
// special case: called from reflect.call (framesize==1)