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runtime: shrink stacks in parallel

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Shrinkstack does not touch normal heap anymore,
so we can shink stacks concurrently with marking.

LGTM=khr
R=golang-codereviews, khr
CC=golang-codereviews, khr, rlh, rsc
https://golang.org/cl/122130043
This commit is contained in:
Dmitriy Vyukov 2014-08-07 12:55:28 +04:00
parent af403c08fc
commit 192bccbf33
1 changed files with 2 additions and 6 deletions
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8
src/pkg/runtime/mgc0.c
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@ -559,6 +559,8 @@ markroot(ParFor *desc, uint32 i)
// needed only to output in traceback
if((gp->status == Gwaiting || gp->status == Gsyscall) && gp->waitsince == 0)
gp->waitsince = work.tstart;
// Shrink a stack if not much of it is being used.
runtime·shrinkstack(gp);
scanstack(gp);
break;
@ -1391,7 +1393,6 @@ gc(struct gc_args *args)
int64 t0, t1, t2, t3, t4;
uint64 heap0, heap1, obj;
GCStats stats;
uint32 i;
if(runtime·debug.allocfreetrace)
runtime·tracegc();
@ -1514,11 +1515,6 @@ gc(struct gc_args *args)
sweep.npausesweep++;
}
// Shrink a stack if not much of it is being used.
// TODO: do in a parfor
for(i = 0; i < runtime·allglen; i++)
runtime·shrinkstack(runtime·allg[i]);
runtime·MProf_GC();
g->m->traceback = 0;
}