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runtime: prefetch next block in mallocgc

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cputime                  99600000     98600000      -1.00%
time                    100005493     98859693      -1.15%

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cputime                  15760000     15440000      -2.03%
time                     15791759     15471701      -2.03%

LGTM=khr
R=golang-codereviews, gobot, khr, dave
CC=bradfitz, golang-codereviews, iant
https://golang.org/cl/57310043
This commit is contained in:
Dmitriy Vyukov 2014-01-28 22:38:39 +04:00
parent d409e44cfb
commit d176e3d7c5
1 changed files with 9 additions and 3 deletions
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12
src/pkg/runtime/malloc.goc
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@ -40,7 +40,7 @@ runtime·mallocgc(uintptr size, uintptr typ, uint32 flag)
intgo rate;
MCache *c;
MCacheList *l;
MLink *v;
MLink *v, *next;
byte *tiny;
if(size == 0) {
@ -120,7 +120,10 @@ runtime·mallocgc(uintptr size, uintptr typ, uint32 flag)
if(l->list == nil)
runtime·MCache_Refill(c, TinySizeClass);
v = l->list;
l->list = v->next;
next = v->next;
if(next != nil) // prefetching nil leads to a DTLB miss
PREFETCH(next);
l->list = next;
l->nlist--;
((uint64*)v)[0] = 0;
((uint64*)v)[1] = 0;
@ -144,7 +147,10 @@ runtime·mallocgc(uintptr size, uintptr typ, uint32 flag)
if(l->list == nil)
runtime·MCache_Refill(c, sizeclass);
v = l->list;
l->list = v->next;
next = v->next;
if(next != nil) // prefetching nil leads to a DTLB miss
PREFETCH(next);
l->list = next;
l->nlist--;
if(!(flag & FlagNoZero)) {
v->next = nil;