From 671814b9044bebd9f5801cf83df74acbdf31d732 Mon Sep 17 00:00:00 2001
From: Dmitriy Vyukov <dvyukov@google.com>
Date: Tue, 28 May 2013 22:04:34 +0400
Subject: runtime: allocate page table lazily This removes the 256MB memory
 allocation at startup, which conflicts with ulimit. Also will allow to
 eliminate an unnecessary memory dereference in GC, because the page table is
 usually mapped at known address. Update #5049. Update #5236.

R=golang-dev, khr, r, khr, rsc
CC=golang-dev
https://golang.org/cl/9791044
---
 src/pkg/runtime/malloc.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/pkg/runtime/malloc.h')

diff --git a/src/pkg/runtime/malloc.h b/src/pkg/runtime/malloc.h
index b4edf7cbef..2131a7e51c 100644
--- a/src/pkg/runtime/malloc.h
+++ b/src/pkg/runtime/malloc.h
@@ -411,7 +411,8 @@ struct MHeap
 	uint32	nspancap;
 
 	// span lookup
-	MSpan *map[1<<MHeapMap_Bits];
+	MSpan**	map;
+	uintptr	spans_mapped;
 
 	// range of addresses we might see in the heap
 	byte *bitmap;
@@ -442,6 +443,7 @@ MSpan*	runtime·MHeap_LookupMaybe(MHeap *h, void *v);
 void	runtime·MGetSizeClassInfo(int32 sizeclass, uintptr *size, int32 *npages, int32 *nobj);
 void*	runtime·MHeap_SysAlloc(MHeap *h, uintptr n);
 void	runtime·MHeap_MapBits(MHeap *h);
+void	runtime·MHeap_MapSpans(MHeap *h);
 void	runtime·MHeap_Scavenger(void);
 
 void*	runtime·mallocgc(uintptr size, uint32 flag, int32 dogc, int32 zeroed);
-- 
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