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runtime: simpler heap map, memory allocation

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The old heap maps used a multilevel table, but that
was overkill: there are only 1M entries on a 32-bit
machine and we can arrange to use a dense address
range on a 64-bit machine.

The heap map is in bss.  The assumption is that if
we don't touch the pages they won't be mapped in.

Also moved some duplicated memory allocation
code out of the OS-specific files.

R=r
CC=golang-dev
https://golang.org/cl/4118042
This commit is contained in:
Russ Cox 2011-01-28 15:03:26 -05:00
parent 50f574515c
commit 4608feb18b
26 changed files with 236 additions and 459 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/pkg/runtime/Makefile
View File

@ -30,7 +30,6 @@ GOFILES=\
hashmap_defs.go\
iface_defs.go\
malloc_defs.go\
mheapmap$(SIZE)_defs.go\
runtime_defs.go\
$(GOOS)/runtime_defs.go\
@ -70,7 +69,6 @@ OFILES=\
mfixalloc.$O\
mgc0.$O\
mheap.$O\
mheapmap$(SIZE).$O\
mprof.$O\
msize.$O\
print.$O\

4
src/pkg/runtime/amd64/traceback.c
View File

@ -60,7 +60,7 @@ gentraceback(byte *pc0, byte *sp, G *g, int32 skip, uintptr *pcbuf, int32 m)
// The 0x48 byte is only on amd64.
p = (byte*)pc;
// We check p < p+8 to avoid wrapping and faulting if we lose track.
if(runtime·mheap.min < p && p < p+8 && p+8 < runtime·mheap.max && // pointer in allocated memory
if(runtime·mheap.arena_start < p && p < p+8 && p+8 < runtime·mheap.arena_used && // pointer in allocated memory
(sizeof(uintptr) != 8 || *p++ == 0x48) && // skip 0x48 byte on amd64
p[0] == 0x81 && p[1] == 0xc4 && p[6] == 0xc3) {
sp += *(uint32*)(p+2);
@ -154,7 +154,7 @@ isclosureentry(uintptr pc)
int32 i, siz;
p = (byte*)pc;
if(p < runtime·mheap.min || p+32 > runtime·mheap.max)
if(p < runtime·mheap.arena_start || p+32 > runtime·mheap.arena_used)
return 0;
// SUBQ $siz, SP

2
src/pkg/runtime/darwin/386/sys.s
View File

@ -138,7 +138,7 @@ TEXT runtime·bsdthread_create(SB),7,$32
MOVL $0x1000000, 20(SP) // flags = PTHREAD_START_CUSTOM
INT $0x80
JAE 3(PC)
MOVL $-1, AX
NEGL AX
RET
MOVL $0, AX
RET

2
src/pkg/runtime/darwin/amd64/sys.s
View File

@ -141,7 +141,7 @@ TEXT runtime·bsdthread_create(SB),7,$0
MOVQ $(0x2000000+360), AX // bsdthread_create
SYSCALL
JCC 3(PC)
MOVL $-1, AX
NEGL AX
RET
MOVL $0, AX
RET

19
src/pkg/runtime/darwin/mem.c
View File

@ -10,10 +10,8 @@ runtime·SysAlloc(uintptr n)
mstats.sys += n;
v = runtime·mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
if(v < (void*)4096) {
runtime·printf("mmap: errno=%p\n", v);
runtime·throw("mmap");
}
if(v < (void*)4096)
return nil;
return v;
}
@ -32,8 +30,19 @@ runtime·SysFree(void *v, uintptr n)
runtime·munmap(v, n);
}
void*
runtime·SysReserve(void *v, uintptr n)
{
return runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
}
void
runtime·SysMemInit(void)
runtime·SysMap(void *v, uintptr n)
{
void *p;
mstats.sys += n;
p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0);
if(p != v)
runtime·throw("runtime: cannot map pages in arena address space");
}

8
src/pkg/runtime/darwin/thread.c
View File

@ -157,13 +157,17 @@ runtime·goenvs(void)
void
runtime·newosproc(M *m, G *g, void *stk, void (*fn)(void))
{
int32 errno;
m->tls[0] = m->id; // so 386 asm can find it
if(0){
runtime·printf("newosproc stk=%p m=%p g=%p fn=%p id=%d/%d ostk=%p\n",
stk, m, g, fn, m->id, m->tls[0], &m);
}
if(runtime·bsdthread_create(stk, m, g, fn) < 0)
runtime·throw("cannot create new OS thread");
if((errno = runtime·bsdthread_create(stk, m, g, fn)) < 0) {
runtime·printf("runtime: failed to create new OS thread (have %d already; errno=%d)\n", runtime·mcount(), -errno);
runtime·throw("runtime.newosproc");
}
}
// Called to initialize a new m (including the bootstrap m).

1
src/pkg/runtime/debug.go
View File

@ -57,7 +57,6 @@ type MemStatsType struct {
MSpanSys uint64
MCacheInuse uint64 // mcache structures
MCacheSys uint64
MHeapMapSys uint64 // heap map
BuckHashSys uint64 // profiling bucket hash table
// Garbage collector statistics.

19
src/pkg/runtime/freebsd/mem.c
View File

@ -10,10 +10,8 @@ runtime·SysAlloc(uintptr n)
mstats.sys += n;
v = runtime·mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
if(v < (void*)4096) {
runtime·printf("mmap: errno=%p\n", v);
runtime·throw("mmap");
}
if(v < (void*)4096)
return nil;
return v;
}
@ -32,8 +30,19 @@ runtime·SysFree(void *v, uintptr n)
runtime·munmap(v, n);
}
void*
runtime·SysReserve(void *v, uintptr n)
{
return runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
}
void
runtime·SysMemInit(void)
runtime·SysMap(void *v, uintptr n)
{
void *p;
mstats.sys += n;
p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0);
if(p != v)
runtime·throw("runtime: cannot map pages in arena address space");
}

23
src/pkg/runtime/linux/mem.c
View File

@ -12,12 +12,11 @@ runtime·SysAlloc(uintptr n)
p = runtime·mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
if(p < (void*)4096) {
if(p == (void*)EACCES) {
runtime·printf("mmap: access denied\n");
runtime·printf("If you're running SELinux, enable execmem for this process.\n");
runtime·printf("runtime: mmap: access denied\n");
runtime·printf("if you're running SELinux, enable execmem for this process.\n");
runtime·exit(2);
}
runtime·printf("mmap: errno=%p\n", p);
runtime·throw("mmap");
return nil;
}
return p;
}
@ -37,7 +36,19 @@ runtime·SysFree(void *v, uintptr n)
runtime·munmap(v, n);
}
void
runtime·SysMemInit(void)
void*
runtime·SysReserve(void *v, uintptr n)
{
return runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
}
void
runtime·SysMap(void *v, uintptr n)
{
void *p;
mstats.sys += n;
p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0);
if(p != v)
runtime·throw("runtime: cannot map pages in arena address space");
}

67
src/pkg/runtime/malloc.goc
View File

@ -175,7 +175,7 @@ runtime·mlookup(void *v, byte **base, uintptr *size, MSpan **sp, uint32 **ref)
MSpan *s;
mstats.nlookup++;
s = runtime·MHeap_LookupMaybe(&runtime·mheap, (uintptr)v>>PageShift);
s = runtime·MHeap_LookupMaybe(&runtime·mheap, v);
if(sp)
*sp = s;
if(s == nil) {
@ -249,8 +249,45 @@ int32 runtime·sizeof_C_MStats = sizeof(MStats);
void
runtime·mallocinit(void)
{
runtime·SysMemInit();
byte *p;
uintptr arena_size;
runtime·InitSizes();
if(sizeof(void*) == 8) {
// On a 64-bit machine, allocate from a single contiguous reservation.
// 16 GB should be big enough for now.
//
// The code will work with the reservation at any address, but ask
// SysReserve to use 0x000000f800000000 if possible.
// Allocating a 16 GB region takes away 36 bits, and the amd64
// doesn't let us choose the top 17 bits, so that leaves the 11 bits
// in the middle of 0x00f8 for us to choose. Choosing 0x00f8 means
// that the valid memory addresses will begin 0x00f8, 0x00f9, 0x00fa, 0x00fb.
// None of the bytes f8 f9 fa fb can appear in valid UTF-8, and
// they are otherwise as far from ff (likely a common byte) as possible.
// Choosing 0x00 for the leading 6 bits was more arbitrary, but it
// is not a common ASCII code point either. Using 0x11f8 instead
// caused out of memory errors on OS X during thread allocations.
// These choices are both for debuggability and to reduce the
// odds of the conservative garbage collector not collecting memory
// because some non-pointer block of memory had a bit pattern
// that matched a memory address.
arena_size = 16LL<<30;
p = runtime·SysReserve((void*)(0x00f8ULL<<32), arena_size);
if(p == nil)
runtime·throw("runtime: cannot reserve arena virtual address space");
runtime·mheap.arena_start = p;
runtime·mheap.arena_used = p;
runtime·mheap.arena_end = p + arena_size;
} else {
// On a 32-bit machine, we'll take what we can get for each allocation
// and maintain arena_start and arena_end as min, max we've seen.
runtime·mheap.arena_start = (byte*)0xffffffff;
runtime·mheap.arena_end = 0;
}
// Initialize the rest of the allocator.
runtime·MHeap_Init(&runtime·mheap, runtime·SysAlloc);
m->mcache = runtime·allocmcache();
@ -258,6 +295,32 @@ runtime·mallocinit(void)
runtime·free(runtime·malloc(1));
}
void*
runtime·MHeap_SysAlloc(MHeap *h, uintptr n)
{
byte *p;
if(sizeof(void*) == 8) {
// Keep taking from our reservation.
if(h->arena_end - h->arena_used < n)
return nil;
p = h->arena_used;
runtime·SysMap(p, n);
h->arena_used += n;
return p;
} else {
// Take what we can get from the OS.
p = runtime·SysAlloc(n);
if(p == nil)
return nil;
if(p+n > h->arena_used)
h->arena_used = p+n;
if(p > h->arena_end)
h->arena_end = p;
return p;
}
}
// Runtime stubs.
void*

42
src/pkg/runtime/malloc.h
View File

@ -19,7 +19,6 @@
// used to manage storage used by the allocator.
// MHeap: the malloc heap, managed at page (4096-byte) granularity.
// MSpan: a run of pages managed by the MHeap.
// MHeapMap: a mapping from page IDs to MSpans.
// MCentral: a shared free list for a given size class.
// MCache: a per-thread (in Go, per-M) cache for small objects.
// MStats: allocation statistics.
@ -84,7 +83,6 @@
typedef struct FixAlloc FixAlloc;
typedef struct MCentral MCentral;
typedef struct MHeap MHeap;
typedef struct MHeapMap MHeapMap;
typedef struct MSpan MSpan;
typedef struct MStats MStats;
typedef struct MLink MLink;
@ -108,13 +106,16 @@ enum
MaxMCacheSize = 2<<20, // Maximum bytes in one MCache
MaxMHeapList = 1<<(20 - PageShift), // Maximum page length for fixed-size list in MHeap.
HeapAllocChunk = 1<<20, // Chunk size for heap growth
};
// Number of bits in page to span calculations (4k pages).
// On 64-bit, we limit the arena to 16G, so 22 bits suffices.
// On 32-bit, we don't bother limiting anything: 20 bits for 4G.
#ifdef _64BIT
#include "mheapmap64.h"
MHeapMap_Bits = 22,
#else
#include "mheapmap32.h"
MHeapMap_Bits = 20,
#endif
};
// A generic linked list of blocks. (Typically the block is bigger than sizeof(MLink).)
struct MLink
@ -124,7 +125,8 @@ struct MLink
// SysAlloc obtains a large chunk of zeroed memory from the
// operating system, typically on the order of a hundred kilobytes
// or a megabyte.
// or a megabyte. If the pointer argument is non-nil, the caller
// wants a mapping there or nowhere.
//
// SysUnused notifies the operating system that the contents
// of the memory region are no longer needed and can be reused
@ -134,11 +136,19 @@ struct MLink
// SysFree returns it unconditionally; this is only used if
// an out-of-memory error has been detected midway through
// an allocation. It is okay if SysFree is a no-op.
//
// SysReserve reserves address space without allocating memory.
// If the pointer passed to it is non-nil, the caller wants the
// reservation there, but SysReserve can still choose another
// location if that one is unavailable.
//
// SysMap maps previously reserved address space for use.
void* runtime·SysAlloc(uintptr nbytes);
void runtime·SysFree(void *v, uintptr nbytes);
void runtime·SysUnused(void *v, uintptr nbytes);
void runtime·SysMemInit(void);
void runtime·SysMap(void *v, uintptr nbytes);
void* runtime·SysReserve(void *v, uintptr nbytes);
// FixAlloc is a simple free-list allocator for fixed size objects.
// Malloc uses a FixAlloc wrapped around SysAlloc to manages its
@ -194,7 +204,6 @@ struct MStats
uint64 mspan_sys;
uint64 mcache_inuse; // MCache structures
uint64 mcache_sys;
uint64 heapmap_sys; // heap map
uint64 buckhash_sys; // profiling bucket hash table
// Statistics about garbage collector.
@ -323,11 +332,13 @@ struct MHeap
MSpan *allspans;
// span lookup
MHeapMap map;
MSpan *map[1<<MHeapMap_Bits];
// range of addresses we might see in the heap
byte *min;
byte *max;
byte *bitmap;
byte *arena_start;
byte *arena_used;
byte *arena_end;
// central free lists for small size classes.
// the union makes sure that the MCentrals are
@ -346,18 +357,15 @@ extern MHeap runtime·mheap;
void runtime·MHeap_Init(MHeap *h, void *(*allocator)(uintptr));
MSpan* runtime·MHeap_Alloc(MHeap *h, uintptr npage, int32 sizeclass, int32 acct);
void runtime·MHeap_Free(MHeap *h, MSpan *s, int32 acct);
MSpan* runtime·MHeap_Lookup(MHeap *h, PageID p);
MSpan* runtime·MHeap_LookupMaybe(MHeap *h, PageID p);
MSpan* runtime·MHeap_Lookup(MHeap *h, void *v);
MSpan* runtime·MHeap_LookupMaybe(MHeap *h, void *v);
void runtime·MGetSizeClassInfo(int32 sizeclass, int32 *size, int32 *npages, int32 *nobj);
void* runtime·MHeap_SysAlloc(MHeap *h, uintptr n);
void* runtime·mallocgc(uintptr size, uint32 flag, int32 dogc, int32 zeroed);
int32 runtime·mlookup(void *v, byte **base, uintptr *size, MSpan **s, uint32 **ref);
void runtime·gc(int32 force);
void* runtime·SysAlloc(uintptr);
void runtime·SysUnused(void*, uintptr);
void runtime·SysFree(void*, uintptr);
enum
{
RefcountOverhead = 4, // one uint32 per object

1
src/pkg/runtime/malloc_defs.go
View File

@ -88,7 +88,6 @@ type mHeap struct {
free [maxMHeapList]mSpan
large mSpan
allspans *mSpan
map_ mHeapMap
min *byte
max *byte
closure_min *byte

3
src/pkg/runtime/mcentral.c
View File

@ -118,8 +118,7 @@ MCentral_Free(MCentral *c, void *v)
int32 size;
// Find span for v.
page = (uintptr)v >> PageShift;
s = runtime·MHeap_Lookup(&runtime·mheap, page);
s = runtime·MHeap_Lookup(&runtime·mheap, v);
if(s == nil || s->ref == 0)
runtime·throw("invalid free");

2
src/pkg/runtime/mgc0.c
View File

@ -76,7 +76,7 @@ scanblock(byte *b, int64 n)
obj = vp[i];
if(obj == nil)
continue;
if(runtime·mheap.min <= (byte*)obj && (byte*)obj < runtime·mheap.max) {
if(runtime·mheap.arena_start <= (byte*)obj && (byte*)obj < runtime·mheap.arena_end) {
if(runtime·mlookup(obj, &obj, &size, nil, &refp)) {
ref = *refp;
switch(ref & ~RefFlags) {

96
src/pkg/runtime/mheap.c
View File

@ -41,7 +41,6 @@ runtime·MHeap_Init(MHeap *h, void *(*alloc)(uintptr))
runtime·FixAlloc_Init(&h->spanalloc, sizeof(MSpan), alloc, RecordSpan, h);
runtime·FixAlloc_Init(&h->cachealloc, sizeof(MCache), alloc, nil, nil);
runtime·MHeapMap_Init(&h->map, alloc);
// h->mapcache needs no init
for(i=0; i<nelem(h->free); i++)
runtime·MSpanList_Init(&h->free[i]);
@ -79,6 +78,7 @@ MHeap_AllocLocked(MHeap *h, uintptr npage, int32 sizeclass)
{
uintptr n;
MSpan *s, *t;
PageID p;
// Try in fixed-size lists up to max.
for(n=npage; n < nelem(h->free); n++) {
@ -112,18 +112,29 @@ HaveSpan:
mstats.mspan_sys = h->spanalloc.sys;
runtime·MSpan_Init(t, s->start + npage, s->npages - npage);
s->npages = npage;
runtime·MHeapMap_Set(&h->map, t->start - 1, s);
runtime·MHeapMap_Set(&h->map, t->start, t);
runtime·MHeapMap_Set(&h->map, t->start + t->npages - 1, t);
p = t->start;
if(sizeof(void*) == 8)
p -= ((uintptr)h->arena_start>>PageShift);
if(p > 0)
h->map[p-1] = s;
h->map[p] = t;
h->map[p+t->npages-1] = t;
*(uintptr*)(t->start<<PageShift) = *(uintptr*)(s->start<<PageShift); // copy "needs zeroing" mark
t->state = MSpanInUse;
MHeap_FreeLocked(h, t);
}
if(*(uintptr*)(s->start<<PageShift) != 0)
runtime·memclr((byte*)(s->start<<PageShift), s->npages<<PageShift);
// Record span info, because gc needs to be
// able to map interior pointer to containing span.
s->sizeclass = sizeclass;
p = s->start;
if(sizeof(void*) == 8)
p -= ((uintptr)h->arena_start>>PageShift);
for(n=0; n<npage; n++)
runtime·MHeapMap_Set(&h->map, s->start+n, s);
h->map[p+n] = s;
return s;
}
@ -161,6 +172,7 @@ MHeap_Grow(MHeap *h, uintptr npage)
uintptr ask;
void *v;
MSpan *s;
PageID p;
// Ask for a big chunk, to reduce the number of mappings
// the operating system needs to track; also amortizes
@ -171,29 +183,21 @@ MHeap_Grow(MHeap *h, uintptr npage)
if(ask < HeapAllocChunk)
ask = HeapAllocChunk;
v = runtime·SysAlloc(ask);
v = runtime·MHeap_SysAlloc(h, ask);
if(v == nil) {
if(ask > (npage<<PageShift)) {
ask = npage<<PageShift;
v = runtime·SysAlloc(ask);
v = runtime·MHeap_SysAlloc(h, ask);
}
if(v == nil)
return false;
}
mstats.heap_sys += ask;
if((byte*)v < h->min || h->min == nil)
h->min = v;
if((byte*)v+ask > h->max)
h->max = (byte*)v+ask;
// NOTE(rsc): In tcmalloc, if we've accumulated enough
// system allocations, the heap map gets entirely allocated
// in 32-bit mode. (In 64-bit mode that's not practical.)
if(!runtime·MHeapMap_Preallocate(&h->map, ((uintptr)v>>PageShift) - 1, (ask>>PageShift) + 2)) {
runtime·SysFree(v, ask);
return false;
}
if((byte*)v < h->arena_start || h->arena_start == nil)
h->arena_start = v;
if((byte*)v+ask > h->arena_end)
h->arena_end = (byte*)v+ask;
// Create a fake "in use" span and free it, so that the
// right coalescing happens.
@ -201,35 +205,50 @@ MHeap_Grow(MHeap *h, uintptr npage)
mstats.mspan_inuse = h->spanalloc.inuse;
mstats.mspan_sys = h->spanalloc.sys;
runtime·MSpan_Init(s, (uintptr)v>>PageShift, ask>>PageShift);
runtime·MHeapMap_Set(&h->map, s->start, s);
runtime·MHeapMap_Set(&h->map, s->start + s->npages - 1, s);
p = s->start;
if(sizeof(void*) == 8)
p -= ((uintptr)h->arena_start>>PageShift);
h->map[p] = s;
h->map[p + s->npages - 1] = s;
s->state = MSpanInUse;
MHeap_FreeLocked(h, s);
return true;
}
// Look up the span at the given page number.
// Page number is guaranteed to be in map
// Look up the span at the given address.
// Address is guaranteed to be in map
// and is guaranteed to be start or end of span.
MSpan*
runtime·MHeap_Lookup(MHeap *h, PageID p)
runtime·MHeap_Lookup(MHeap *h, void *v)
{
return runtime·MHeapMap_Get(&h->map, p);
uintptr p;
p = (uintptr)v;
if(sizeof(void*) == 8)
p -= (uintptr)h->arena_start;
return h->map[p >> PageShift];
}
// Look up the span at the given page number.
// Page number is *not* guaranteed to be in map
// Look up the span at the given address.
// Address is *not* guaranteed to be in map
// and may be anywhere in the span.
// Map entries for the middle of a span are only
// valid for allocated spans. Free spans may have
// other garbage in their middles, so we have to
// check for that.
MSpan*
runtime·MHeap_LookupMaybe(MHeap *h, PageID p)
runtime·MHeap_LookupMaybe(MHeap *h, void *v)
{
MSpan *s;
PageID p, q;
s = runtime·MHeapMap_GetMaybe(&h->map, p);
if((byte*)v < h->arena_start || (byte*)v >= h->arena_used)
return nil;
p = (uintptr)v>>PageShift;
q = p;
if(sizeof(void*) == 8)
q -= (uintptr)h->arena_start >> PageShift;
s = h->map[q];
if(s == nil || p < s->start || p - s->start >= s->npages)
return nil;
if(s->state != MSpanInUse)
@ -258,7 +277,9 @@ runtime·MHeap_Free(MHeap *h, MSpan *s, int32 acct)
static void
MHeap_FreeLocked(MHeap *h, MSpan *s)
{
uintptr *sp, *tp;
MSpan *t;
PageID p;
if(s->state != MSpanInUse || s->ref != 0) {
runtime·printf("MHeap_FreeLocked - span %p ptr %p state %d ref %d\n", s, s->start<<PageShift, s->state, s->ref);
@ -266,21 +287,30 @@ MHeap_FreeLocked(MHeap *h, MSpan *s)
}
s->state = MSpanFree;
runtime·MSpanList_Remove(s);
sp = (uintptr*)(s->start<<PageShift);
// Coalesce with earlier, later spans.
if((t = runtime·MHeapMap_Get(&h->map, s->start - 1)) != nil && t->state != MSpanInUse) {
p = s->start;
if(sizeof(void*) == 8)
p -= (uintptr)h->arena_start >> PageShift;
if(p > 0 && (t = h->map[p-1]) != nil && t->state != MSpanInUse) {
tp = (uintptr*)(t->start<<PageShift);
*tp |= *sp; // propagate "needs zeroing" mark
s->start = t->start;
s->npages += t->npages;
runtime·MHeapMap_Set(&h->map, s->start, s);
p -= t->npages;
h->map[p] = s;
runtime·MSpanList_Remove(t);
t->state = MSpanDead;
runtime·FixAlloc_Free(&h->spanalloc, t);
mstats.mspan_inuse = h->spanalloc.inuse;
mstats.mspan_sys = h->spanalloc.sys;
}
if((t = runtime·MHeapMap_Get(&h->map, s->start + s->npages)) != nil && t->state != MSpanInUse) {
if(p+s->npages < nelem(h->map) && (t = h->map[p+s->npages]) != nil && t->state != MSpanInUse) {
tp = (uintptr*)(t->start<<PageShift);
*sp |= *tp; // propagate "needs zeroing" mark
s->npages += t->npages;
runtime·MHeapMap_Set(&h->map, s->start + s->npages - 1, s);
h->map[p + s->npages - 1] = s;
runtime·MSpanList_Remove(t);
t->state = MSpanDead;
runtime·FixAlloc_Free(&h->spanalloc, t);

96
src/pkg/runtime/mheapmap32.c
View File

@ -1,96 +0,0 @@
// 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.
// Heap map, 32-bit version
// See malloc.h and mheap.c for overview.
#include "runtime.h"
#include "malloc.h"
// 3-level radix tree mapping page ids to Span*.
void
runtime·MHeapMap_Init(MHeapMap *m, void *(*allocator)(uintptr))
{
m->allocator = allocator;
}
MSpan*
runtime·MHeapMap_Get(MHeapMap *m, PageID k)
{
int32 i1, i2;
i2 = k & MHeapMap_Level2Mask;
k >>= MHeapMap_Level2Bits;
i1 = k & MHeapMap_Level1Mask;
k >>= MHeapMap_Level1Bits;
if(k != 0)
runtime·throw("MHeapMap_Get");
return m->p[i1]->s[i2];
}
MSpan*
runtime·MHeapMap_GetMaybe(MHeapMap *m, PageID k)
{
int32 i1, i2;
MHeapMapNode2 *p2;
i2 = k & MHeapMap_Level2Mask;
k >>= MHeapMap_Level2Bits;
i1 = k & MHeapMap_Level1Mask;
k >>= MHeapMap_Level1Bits;
if(k != 0)
runtime·throw("MHeapMap_Get");
p2 = m->p[i1];
if(p2 == nil)
return nil;
return p2->s[i2];
}
void
runtime·MHeapMap_Set(MHeapMap *m, PageID k, MSpan *s)
{
int32 i1, i2;
i2 = k & MHeapMap_Level2Mask;
k >>= MHeapMap_Level2Bits;
i1 = k & MHeapMap_Level1Mask;
k >>= MHeapMap_Level1Bits;
if(k != 0)
runtime·throw("MHeapMap_Set");
m->p[i1]->s[i2] = s;
}
// Allocate the storage required for entries [k, k+1, ..., k+len-1]
// so that Get and Set calls need not check for nil pointers.
bool
runtime·MHeapMap_Preallocate(MHeapMap *m, PageID k, uintptr len)
{
uintptr end;
int32 i1;
MHeapMapNode2 *p2;
end = k+len;
while(k < end) {
if((k >> MHeapMap_TotalBits) != 0)
return false;
i1 = (k >> MHeapMap_Level2Bits) & MHeapMap_Level1Mask;
// first-level pointer
if(m->p[i1] == nil) {
p2 = m->allocator(sizeof *p2);
if(p2 == nil)
return false;
mstats.heapmap_sys += sizeof *p2;
m->p[i1] = p2;
}
// advance key past this leaf node
k = ((k >> MHeapMap_Level2Bits) + 1) << MHeapMap_Level2Bits;
}
return true;
}

41
src/pkg/runtime/mheapmap32.h
View File

@ -1,41 +0,0 @@
// 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.
// Free(v) must be able to determine the MSpan containing v.
// The MHeapMap is a 2-level radix tree mapping page numbers to MSpans.
typedef struct MHeapMapNode2 MHeapMapNode2;
enum
{
// 32 bit address - 12 bit page size = 20 bits to map
MHeapMap_Level1Bits = 10,
MHeapMap_Level2Bits = 10,
MHeapMap_TotalBits =
MHeapMap_Level1Bits +
MHeapMap_Level2Bits,
MHeapMap_Level1Mask = (1<<MHeapMap_Level1Bits) - 1,
MHeapMap_Level2Mask = (1<<MHeapMap_Level2Bits) - 1,
};
struct MHeapMap
{
void *(*allocator)(uintptr);
MHeapMapNode2 *p[1<<MHeapMap_Level1Bits];
};
struct MHeapMapNode2
{
MSpan *s[1<<MHeapMap_Level2Bits];
};
void runtime·MHeapMap_Init(MHeapMap *m, void *(*allocator)(uintptr));
bool runtime·MHeapMap_Preallocate(MHeapMap *m, PageID k, uintptr npages);
MSpan* runtime·MHeapMap_Get(MHeapMap *m, PageID k);
MSpan* runtime·MHeapMap_GetMaybe(MHeapMap *m, PageID k);
void runtime·MHeapMap_Set(MHeapMap *m, PageID k, MSpan *v);

23
src/pkg/runtime/mheapmap32_defs.go
View File

@ -1,23 +0,0 @@
// Copyright 2010 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.
package runtime
const (
mHeapMap_Level1Bits = 10
mHeapMap_Level2Bits = 10
mHeapMap_TotalBits = mHeapMap_Level1Bits + mHeapMap_Level2Bits
mHeapMap_Level1Mask = (1 << mHeapMap_Level1Bits) - 1
mHeapMap_Level2Mask = (1 << mHeapMap_Level2Bits) - 1
)
type mHeapMap struct {
allocator func(uintptr)
p [1 << mHeapMap_Level1Bits]*mHeapMapNode2
}
type mHeapMapNode2 struct {
s [1 << mHeapMap_Level2Bits]*mSpan
}

117
src/pkg/runtime/mheapmap64.c
View File

@ -1,117 +0,0 @@
// 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.
// Heap map, 64-bit version
// See malloc.h and mheap.c for overview.
#include "runtime.h"
#include "malloc.h"
// 3-level radix tree mapping page ids to Span*.
void
runtime·MHeapMap_Init(MHeapMap *m, void *(*allocator)(uintptr))
{
m->allocator = allocator;
}
MSpan*
runtime·MHeapMap_Get(MHeapMap *m, PageID k)
{
int32 i1, i2, i3;
i3 = k & MHeapMap_Level3Mask;
k >>= MHeapMap_Level3Bits;
i2 = k & MHeapMap_Level2Mask;
k >>= MHeapMap_Level2Bits;
i1 = k & MHeapMap_Level1Mask;
k >>= MHeapMap_Level1Bits;
if(k != 0)
runtime·throw("MHeapMap_Get");
return m->p[i1]->p[i2]->s[i3];
}
MSpan*
runtime·MHeapMap_GetMaybe(MHeapMap *m, PageID k)
{
int32 i1, i2, i3;
MHeapMapNode2 *p2;
MHeapMapNode3 *p3;
i3 = k & MHeapMap_Level3Mask;
k >>= MHeapMap_Level3Bits;
i2 = k & MHeapMap_Level2Mask;
k >>= MHeapMap_Level2Bits;
i1 = k & MHeapMap_Level1Mask;
k >>= MHeapMap_Level1Bits;
if(k != 0)
runtime·throw("MHeapMap_Get");
p2 = m->p[i1];
if(p2 == nil)
return nil;
p3 = p2->p[i2];
if(p3 == nil)
return nil;
return p3->s[i3];
}
void
runtime·MHeapMap_Set(MHeapMap *m, PageID k, MSpan *s)
{
int32 i1, i2, i3;
i3 = k & MHeapMap_Level3Mask;
k >>= MHeapMap_Level3Bits;
i2 = k & MHeapMap_Level2Mask;
k >>= MHeapMap_Level2Bits;
i1 = k & MHeapMap_Level1Mask;
k >>= MHeapMap_Level1Bits;
if(k != 0)
runtime·throw("MHeapMap_Set");
m->p[i1]->p[i2]->s[i3] = s;
}
// Allocate the storage required for entries [k, k+1, ..., k+len-1]
// so that Get and Set calls need not check for nil pointers.
bool
runtime·MHeapMap_Preallocate(MHeapMap *m, PageID k, uintptr len)
{
uintptr end;
int32 i1, i2;
MHeapMapNode2 *p2;
MHeapMapNode3 *p3;
end = k+len;
while(k < end) {
if((k >> MHeapMap_TotalBits) != 0)
return false;
i2 = (k >> MHeapMap_Level3Bits) & MHeapMap_Level2Mask;
i1 = (k >> (MHeapMap_Level3Bits + MHeapMap_Level2Bits)) & MHeapMap_Level1Mask;
// first-level pointer
if((p2 = m->p[i1]) == nil) {
p2 = m->allocator(sizeof *p2);
if(p2 == nil)
return false;
mstats.heapmap_sys += sizeof *p2;
m->p[i1] = p2;
}
// second-level pointer
if(p2->p[i2] == nil) {
p3 = m->allocator(sizeof *p3);
if(p3 == nil)
return false;
mstats.heapmap_sys += sizeof *p3;
p2->p[i2] = p3;
}
// advance key past this leaf node
k = ((k >> MHeapMap_Level3Bits) + 1) << MHeapMap_Level3Bits;
}
return true;
}

60
src/pkg/runtime/mheapmap64.h
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@ -1,60 +0,0 @@
// 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.
// Free(v) must be able to determine the MSpan containing v.
// The MHeapMap is a 3-level radix tree mapping page numbers to MSpans.
//
// NOTE(rsc): On a 32-bit platform (= 20-bit page numbers),
// we can swap in a 2-level radix tree.
//
// NOTE(rsc): We use a 3-level tree because tcmalloc does, but
// having only three levels requires approximately 1 MB per node
// in the tree, making the minimum map footprint 3 MB.
// Using a 4-level tree would cut the minimum footprint to 256 kB.
// On the other hand, it's just virtual address space: most of
// the memory is never going to be touched, thus never paged in.
typedef struct MHeapMapNode2 MHeapMapNode2;
typedef struct MHeapMapNode3 MHeapMapNode3;
enum
{
// 64 bit address - 12 bit page size = 52 bits to map
MHeapMap_Level1Bits = 18,
MHeapMap_Level2Bits = 18,
MHeapMap_Level3Bits = 16,
MHeapMap_TotalBits =
MHeapMap_Level1Bits +
MHeapMap_Level2Bits +
MHeapMap_Level3Bits,
MHeapMap_Level1Mask = (1<<MHeapMap_Level1Bits) - 1,
MHeapMap_Level2Mask = (1<<MHeapMap_Level2Bits) - 1,
MHeapMap_Level3Mask = (1<<MHeapMap_Level3Bits) - 1,
};
struct MHeapMap
{
void *(*allocator)(uintptr);
MHeapMapNode2 *p[1<<MHeapMap_Level1Bits];
};
struct MHeapMapNode2
{
MHeapMapNode3 *p[1<<MHeapMap_Level2Bits];
};
struct MHeapMapNode3
{
MSpan *s[1<<MHeapMap_Level3Bits];
};
void runtime·MHeapMap_Init(MHeapMap *m, void *(*allocator)(uintptr));
bool runtime·MHeapMap_Preallocate(MHeapMap *m, PageID k, uintptr npages);
MSpan* runtime·MHeapMap_Get(MHeapMap *m, PageID k);
MSpan* runtime·MHeapMap_GetMaybe(MHeapMap *m, PageID k);
void runtime·MHeapMap_Set(MHeapMap *m, PageID k, MSpan *v);

31
src/pkg/runtime/mheapmap64_defs.go
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@ -1,31 +0,0 @@
// Copyright 2010 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.
package runtime
const (
mHeapMap_Level1Bits = 18
mHeapMap_Level2Bits = 18
mHeapMap_Level3Bits = 16
mHeapMap_TotalBits = mHeapMap_Level1Bits + mHeapMap_Level2Bits + mHeapMap_Level3Bits
mHeapMap_Level1Mask = (1 << mHeapMap_Level1Bits) - 1
mHeapMap_Level2Mask = (1 << mHeapMap_Level2Bits) - 1
mHeapMap_Level3Mask = (1 << mHeapMap_Level3Bits) - 1
)
type mHeapMap struct {
allocator func(uintptr)
p [1 << mHeapMap_Level1Bits]*mHeapMapNode2
}
type mHeapMapNode2 struct {
p [1 << mHeapMap_Level2Bits]*mHeapMapNode3
}
type mHeapMapNode3 struct {
s [1 << mHeapMap_Level3Bits]*mSpan
}

1
src/pkg/runtime/pprof/pprof.go
View File

@ -88,7 +88,6 @@ func WriteHeapProfile(w io.Writer) os.Error {
fmt.Fprintf(b, "# Stack = %d / %d\n", s.StackInuse, s.StackSys)
fmt.Fprintf(b, "# MSpan = %d / %d\n", s.MSpanInuse, s.MSpanSys)
fmt.Fprintf(b, "# MCache = %d / %d\n", s.MCacheInuse, s.MCacheSys)
fmt.Fprintf(b, "# MHeapMapSys = %d\n", s.MHeapMapSys)
fmt.Fprintf(b, "# BuckHashSys = %d\n", s.BuckHashSys)
fmt.Fprintf(b, "# NextGC = %d\n", s.NextGC)

6
src/pkg/runtime/proc.c
View File

@ -1190,3 +1190,9 @@ runtime·Goroutines(int32 ret)
ret = runtime·sched.gcount;
FLUSH(&ret);
}
int32
runtime·mcount(void)
{
return runtime·sched.mcount;
}

1
src/pkg/runtime/runtime.h
View File

@ -436,6 +436,7 @@ void runtime·addfinalizer(void*, void(*fn)(void*), int32);
void runtime·walkfintab(void (*fn)(void*));
void runtime·runpanic(Panic*);
void* runtime·getcallersp(void*);
int32 runtime·mcount(void);
void runtime·exit(int32);
void runtime·breakpoint(void);

24
src/pkg/runtime/windows/mem.c
View File

@ -33,12 +33,8 @@ extern void *runtime·VirtualFree;
void*
runtime·SysAlloc(uintptr n)
{
void *v;
v = runtime·stdcall(runtime·VirtualAlloc, 4, nil, n, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
if(v == 0)
abort("VirtualAlloc");
return v;
mstats.sys += n;
return runtime·stdcall(runtime·VirtualAlloc, 4, v, n, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
}
void
@ -53,13 +49,25 @@ runtime·SysFree(void *v, uintptr n)
{
uintptr r;
USED(n);
mstats.sys -= n;
r = (uintptr)runtime·stdcall(runtime·VirtualFree, 3, v, 0, MEM_RELEASE);
if(r == 0)
abort("VirtualFree");
}
void
runtime·SysMemInit(void)
runtime·SysReserve(void *v, uintptr n)
{
return runtime·stdcall(runtime·VirtualAlloc, 4, v, n, MEM_RESERVE, 0);
}
void
runtime·SysMap(void *v, uintptr n)
{
void *p;
mstats.sys += n;
p = runtime·stdcall(runtime·VirtualAlloc, 4, v, n, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
if(p != v)
runtime·throw("runtime: cannot map pages in arena address space");
}

4
test/run
View File

@ -42,7 +42,9 @@ TMP2FILE=/tmp/gotest2-$$-$USER
# don't run the machine out of memory: limit individual processes to 4GB.
# on thresher, 3GB suffices to run the tests; with 2GB, peano fails.
ulimit -v 4000000
# Linux charges reserved but not mapped addresses to ulimit -v
# so we have to use ulimit -m.
ulimit -m 4000000
# no core files please
ulimit -c 0