82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Per-P malloc cache for small objects.
|
|
//
|
|
// See malloc.h for an overview.
|
|
|
|
#include "runtime.h"
|
|
#include "arch.h"
|
|
#include "malloc.h"
|
|
|
|
void
|
|
runtime_MCache_Refill(MCache *c, int32 sizeclass)
|
|
{
|
|
MCacheList *l;
|
|
|
|
// Replenish using central lists.
|
|
l = &c->list[sizeclass];
|
|
if(l->list)
|
|
runtime_throw("MCache_Refill: the list is not empty");
|
|
l->nlist = runtime_MCentral_AllocList(&runtime_mheap.central[sizeclass], &l->list);
|
|
if(l->list == nil)
|
|
runtime_throw("out of memory");
|
|
}
|
|
|
|
// Take n elements off l and return them to the central free list.
|
|
static void
|
|
ReleaseN(MCacheList *l, int32 n, int32 sizeclass)
|
|
{
|
|
MLink *first, **lp;
|
|
int32 i;
|
|
|
|
// Cut off first n elements.
|
|
first = l->list;
|
|
lp = &l->list;
|
|
for(i=0; i<n; i++)
|
|
lp = &(*lp)->next;
|
|
l->list = *lp;
|
|
*lp = nil;
|
|
l->nlist -= n;
|
|
|
|
// Return them to central free list.
|
|
runtime_MCentral_FreeList(&runtime_mheap.central[sizeclass], first);
|
|
}
|
|
|
|
void
|
|
runtime_MCache_Free(MCache *c, void *v, int32 sizeclass, uintptr size)
|
|
{
|
|
MCacheList *l;
|
|
MLink *p;
|
|
|
|
// Put back on list.
|
|
l = &c->list[sizeclass];
|
|
p = v;
|
|
p->next = l->list;
|
|
l->list = p;
|
|
l->nlist++;
|
|
c->local_cachealloc -= size;
|
|
|
|
// We transfer span at a time from MCentral to MCache,
|
|
// if we have 2 times more than that, release a half back.
|
|
if(l->nlist >= 2*(runtime_class_to_allocnpages[sizeclass]<<PageShift)/size)
|
|
ReleaseN(l, l->nlist/2, sizeclass);
|
|
}
|
|
|
|
void
|
|
runtime_MCache_ReleaseAll(MCache *c)
|
|
{
|
|
int32 i;
|
|
MCacheList *l;
|
|
|
|
for(i=0; i<NumSizeClasses; i++) {
|
|
l = &c->list[i];
|
|
if(l->list) {
|
|
runtime_MCentral_FreeList(&runtime_mheap.central[i], l->list);
|
|
l->list = nil;
|
|
l->nlist = 0;
|
|
}
|
|
}
|
|
}
|