code review 69870055: runtime: fix runaway memory usage

src/pkg/runtime/mcache.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_GOARCH.h"
@@ skipping 79 matching lines @@
 void
 runtime·MCache_Free(MCache *c, MLink *p, int32 sizeclass, uintptr size)
 {
         MCacheList *l;
 
         // Put on free list.
         l = &c->free[sizeclass];
         p->next = l->list;
         l->list = p;
         l->nlist++;
-        c->local_cachealloc -= size;
 
         // We transfer a span at a time from MCentral to MCache,
         // so we'll do the same in the other direction.
         if(l->nlist >= (runtime·class_to_allocnpages[sizeclass]<<PageShift)/size) {
                 runtime·MCentral_FreeList(&runtime·mheap.central[sizeclass], l->list);
                 l->list = nil;
                 l->nlist = 0;
         }
 }
 
@@ skipping 11 matching lines @@
                         c->alloc[i] = &emptymspan;
                 }
                 l = &c->free[i];
                 if(l->nlist > 0) {
                         runtime·MCentral_FreeList(&runtime·mheap.central[i], l->list);
                         l->list = nil;
                         l->nlist = 0;
                 }
         }
 }