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simplify heap.cpp by allocating segments pessimistically
This commit is contained in:
Joel Dice
parent
77136e77cb
commit
215a52ba54
8
makefile
8
makefile
@ -17,7 +17,7 @@ classpath = classpath
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test = test
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jscheme = /tmp/jscheme
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input = $(cls)/Switch.class
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input = $(cls)/GC.class
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cxx = g++
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cc = gcc
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@ -129,7 +129,7 @@ classpath-objects = $(classpath-classes) $(jni-library)
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class-name = $(patsubst $(cls)/%.class,%,$(1))
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class-names = $(foreach x,$(1),$(call class-name,$(x)))
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flags = -cp $(cls) -hs 67108864
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flags = -cp $(cls)
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args = $(flags) $(call class-name,$(input))
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.PHONY: build
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@ -147,7 +147,7 @@ debug: $(executable) $(input)
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.PHONY: debug-jscheme
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debug-jscheme: $(executable) $(input)
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LD_LIBRARY_PATH=$(bld) gdb --args $(<) -cp $(cls):$(jscheme) -hs 67108864 \
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LD_LIBRARY_PATH=$(bld) gdb --args $(<) -cp $(cls):$(jscheme) \
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jscheme/REPL
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.PHONY: vg
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@ -156,7 +156,7 @@ vg: $(executable) $(input)
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.PHONY: vg-jscheme
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vg-jscheme: $(executable) $(input)
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LD_LIBRARY_PATH=$(bld) $(vg) $(<) -cp $(cls):$(jscheme) -hs 67108864 \
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LD_LIBRARY_PATH=$(bld) $(vg) $(<) -cp $(cls):$(jscheme) \
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jscheme/REPL
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.PHONY: test
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615
src/heap.cpp
615
src/heap.cpp
@ -2,19 +2,14 @@
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#include "system.h"
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#include "common.h"
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#define CHAIN_HEADER_SIZE ceiling(sizeof(Segment::Chain), BytesPerWord)
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using namespace vm;
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namespace {
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// an object must survive TenureThreshold + 2 garbage collections
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// before being copied to gen2:
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// before being copied to gen2 (muat be at least 1):
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const unsigned TenureThreshold = 3;
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const unsigned MinimumGen1SizeInBytes = 64 * 1024;
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const unsigned MinimumGen2SizeInBytes = 128 * 1024;
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const unsigned Top = ~static_cast<unsigned>(0);
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const bool Verbose = true;
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@ -22,10 +17,11 @@ const bool Debug = false;
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class Context;
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System* system(Context*);
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void NO_RETURN abort(Context*);
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void assert(Context*, bool);
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System* system(Context*);
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inline object
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get(object o, unsigned offsetInWords)
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{
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@ -56,8 +52,6 @@ class Segment {
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public:
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class Map {
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public:
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class Chain;
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class Iterator {
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public:
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Map* map;
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@ -124,8 +118,8 @@ class Segment {
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unsigned scale;
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bool clearNewData;
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Map(Segment* segment, unsigned bitsPerRecord = 1, unsigned scale = 1,
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Map* child = 0, bool clearNewData = true):
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Map(Segment* segment, unsigned bitsPerRecord, unsigned scale,
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Map* child, bool clearNewData):
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segment(segment),
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child(child),
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bitsPerRecord(bitsPerRecord),
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@ -133,10 +127,18 @@ class Segment {
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clearNewData(clearNewData)
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{ }
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void check() {
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void init() {
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assert(segment->context, bitsPerRecord);
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assert(segment->context, scale);
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assert(segment->context, powerOfTwo(scale));
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if (clearNewData) {
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memset(data(), 0, size() * BytesPerWord);
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}
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if (child) {
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child->init();
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}
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}
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void replaceWith(Map* m) {
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@ -159,7 +161,7 @@ class Segment {
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}
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uintptr_t* data() {
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return segment->rear->data() + segment->rear->capacity + offset();
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return segment->data + segment->capacity() + offset();
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}
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unsigned size(unsigned capacity) {
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@ -196,12 +198,6 @@ class Segment {
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}
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}
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void clear() {
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memset(data(), 0, size() * BytesPerWord);
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if (child) child->clear();
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}
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void clearBit(unsigned i) {
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assert(segment->context, wordOf(i) < size());
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@ -275,130 +271,50 @@ class Segment {
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}
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};
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class Chain {
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public:
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Segment* segment;
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unsigned offset;
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unsigned position;
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unsigned capacity;
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Chain* next;
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Chain* previous;
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Chain(Segment* segment, unsigned capacity, Chain* previous):
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segment(segment),
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offset(previous ? previous->offset + previous->position : 0),
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position(0),
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capacity(capacity),
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next(0),
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previous(previous)
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{
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assert(segment->context, sizeof(Chain) % BytesPerWord == 0);
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}
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static Chain* make(Segment* s, unsigned minimum, unsigned desired) {
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assert(s->context, minimum > 0);
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assert(s->context, desired >= minimum);
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void* p = 0;
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unsigned capacity = desired;
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while (p == 0) {
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p = system(s->context)->tryAllocate
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(footprint(capacity, s->rear, s->map) * BytesPerWord);
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if (p == 0) {
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if (capacity > minimum) {
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capacity = avg(minimum, capacity);
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} else {
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abort(s->context);
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}
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}
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}
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return new (p) Chain(s, capacity, s->rear);
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}
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static void dispose(Chain* c) {
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if (c) {
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if (c->next) dispose(c->next);
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system(c->segment->context)->free(c);
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}
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}
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uintptr_t* data() {
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return reinterpret_cast<uintptr_t*>(this) + CHAIN_HEADER_SIZE;
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}
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static unsigned footprint(unsigned capacity, Chain* previous,
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Map* map)
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{
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unsigned n = CHAIN_HEADER_SIZE + capacity;
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if (map) {
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unsigned segmentCapacity = capacity;
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if (previous) {
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segmentCapacity += previous->offset + previous->position;
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}
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n += map->footprint(segmentCapacity);
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}
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return n;
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}
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unsigned footprint() {
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return footprint(capacity, previous, segment->map);
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}
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};
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Context* context;
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Chain* front;
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Chain* rear;
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uintptr_t* data;
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unsigned position_;
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unsigned capacity_;
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Map* map;
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Segment(Context* context, unsigned minimum, unsigned desired, Map* map = 0):
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Segment(Context* context, Map* map, unsigned desired, unsigned minimum):
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context(context),
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front(0),
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rear(0),
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data(0),
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position_(0),
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capacity_(0),
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map(map)
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{
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if (desired) {
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front = rear = Chain::make(this, minimum, desired);
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assert(context, minimum > 0);
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assert(context, desired >= minimum);
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capacity_ = desired;
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while (data == 0) {
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data = static_cast<uintptr_t*>
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(system(context)->tryAllocate
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((capacity_ + map->footprint(capacity_)) * BytesPerWord));
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if (data == 0) {
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if (capacity_ > minimum) {
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capacity_ = avg(minimum, capacity_);
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} else {
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abort(context);
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}
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}
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}
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if (map) {
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map->check();
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if (map->clearNewData) {
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memset(front->data() + front->capacity, 0,
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map->footprint(front->capacity) * BytesPerWord);
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}
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map->init();
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}
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}
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}
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unsigned capacity() {
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return (rear? rear->offset + rear->capacity : 0);
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return capacity_;
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}
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unsigned position() {
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return (rear? rear->offset + rear->position : 0);
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}
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void truncate(unsigned offset) {
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assert(context, offset <= position());
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for (Chain* c = front; c; c = c->next) {
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if (offset >= c->offset
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and offset <= c->offset + c->position)
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{
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c->position = offset - c->offset;
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Chain::dispose(c->next);
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return;
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}
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}
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abort(context);
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}
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unsigned footprint() {
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unsigned n = 0;
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for (Chain* c = front; c; c = c->next) n += c->footprint();
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return n;
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return position_;
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}
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unsigned remaining() {
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@ -406,12 +322,15 @@ class Segment {
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}
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void replaceWith(Segment* s) {
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Chain::dispose(front);
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system(context)->free(data);
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data = s->data;
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s->data = 0;
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front = s->front;
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rear = s->rear;
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position_ = s->position_;
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s->position_ = 0;
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s->front = s->rear = 0;
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capacity_ = s->capacity_;
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s->capacity_ = 0;
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if (s->map) {
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if (map) {
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@ -426,108 +345,39 @@ class Segment {
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}
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bool contains(void* p) {
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for (Chain* c = front; c; c = c->next) {
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if (c->position and p >= c->data() and p < c->data() + c->position) {
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return true;
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}
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}
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return false;
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return position() and p >= data and p < data + position();
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}
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bool almostContains(void* p) {
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return contains(p) or p == rear->data() + rear->position;
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return contains(p) or p == data + position();
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}
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void* get(unsigned offset) {
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for (Chain* c = front; c; c = c->next) {
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if (c->position
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and offset >= c->offset
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and offset < c->offset + c->position)
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{
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return c->data() + (offset - c->offset);
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}
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}
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if (offset == rear->offset + rear->position) {
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return rear->data() + (offset - rear->offset);
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}
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abort(context);
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assert(context, offset <= position());
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return data + offset;
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}
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unsigned indexOf(void* p) {
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for (Chain* c = front; c; c = c->next) {
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if (c->position and p >= c->data() and p < c->data() + c->position) {
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return (static_cast<uintptr_t*>(p) - c->data()) + c->offset;
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}
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}
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if (p == rear->data() + rear->position) {
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return (static_cast<uintptr_t*>(p) - rear->data()) + rear->offset;
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}
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abort(context);
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assert(context, almostContains(p));
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return static_cast<uintptr_t*>(p) - data;
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}
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void* allocate(unsigned size) {
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assert(context, size);
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assert(context, rear->position + size <= rear->capacity);
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void* p = reinterpret_cast<void**>(rear->data()) + rear->position;
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rear->position += size;
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assert(context, position() + size <= capacity());
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void* p = data + position();
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position_ += size;
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return p;
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}
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void ensure(unsigned minimum) {
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if (remaining() < minimum) {
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assert(context, rear->next == 0);
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if (rear->position == 0) {
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Chain* c = rear;
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if (front == rear) {
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front = rear = 0;
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} else {
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rear = rear->previous;
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}
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Chain::dispose(c);
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}
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unsigned desired = capacity() + minimum;
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Chain* c = Chain::make(this, minimum, desired);
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if (map) {
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if (map->clearNewData) {
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memset(c->data() + c->capacity, 0,
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map->footprint(c->offset + c->capacity) * BytesPerWord);
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}
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map->update(c->data() + c->capacity, c->offset + c->capacity);
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}
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if (rear) {
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rear->next = c;
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rear = c;
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} else {
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front = rear = c;
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}
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}
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}
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void dispose() {
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Chain::dispose(front);
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front = rear = 0;
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system(context)->free(data);
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data = 0;
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map = 0;
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}
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};
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enum CollectionMode {
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MinorCollection,
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MajorCollection,
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OverflowCollection,
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Gen2Collection
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};
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class Context {
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public:
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Context(System* system):
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@ -535,21 +385,27 @@ class Context {
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client(0),
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ageMap(&gen1, log(TenureThreshold), 1, 0, false),
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gen1(this, 0, 0, &ageMap),
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gen1(this, &ageMap, 0, 0),
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nextAgeMap(&nextGen1, log(TenureThreshold), 1, 0, false),
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nextGen1(this, 0, 0, &nextAgeMap),
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nextGen1(this, &nextAgeMap, 0, 0),
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pointerMap(&gen2),
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pageMap(&gen2, 1, LikelyPageSizeInBytes / BytesPerWord, &pointerMap),
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heapMap(&gen2, 1, pageMap.scale * 1024, &pageMap),
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gen2(this, 0, 0, &heapMap),
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pointerMap(&gen2, 1, 1, 0, true),
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pageMap(&gen2, 1, LikelyPageSizeInBytes / BytesPerWord, &pointerMap, true),
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heapMap(&gen2, 1, pageMap.scale * 1024, &pageMap, true),
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gen2(this, &heapMap, 0, 0),
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nextPointerMap(&nextGen2),
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nextPointerMap(&nextGen2, 1, 1, 0, true),
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nextPageMap(&nextGen2, 1, LikelyPageSizeInBytes / BytesPerWord,
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&nextPointerMap),
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nextHeapMap(&nextGen2, 1, nextPageMap.scale * 1024, &nextPageMap),
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nextGen2(this, 0, 0, &nextHeapMap)
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&nextPointerMap, true),
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nextHeapMap(&nextGen2, 1, nextPageMap.scale * 1024, &nextPageMap, true),
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nextGen2(this, &nextHeapMap, 0, 0),
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gen2Base(0),
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tenureFootprint(0),
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gen1padding(0),
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gen2padding(0),
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mode(Heap::MinorCollection)
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{ }
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void dispose() {
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@ -580,9 +436,19 @@ class Context {
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unsigned gen2Base;
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CollectionMode mode;
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unsigned tenureFootprint;
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unsigned gen1padding;
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unsigned gen2padding;
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Heap::CollectionType mode;
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};
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inline System*
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system(Context* c)
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{
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return c->system;
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}
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const char*
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segment(Context* c, void* p)
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{
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@ -599,12 +465,6 @@ segment(Context* c, void* p)
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}
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}
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inline System*
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system(Context* c)
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{
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return c->system;
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}
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inline void NO_RETURN
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abort(Context* c)
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{
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@ -617,33 +477,17 @@ assert(Context* c, bool v)
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assert(c->system, v);
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}
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void
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initGen1(Context* c)
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inline void
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initNextGen1(Context* c, unsigned footprint)
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{
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unsigned minimum = MinimumGen1SizeInBytes / BytesPerWord;
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unsigned desired = minimum;
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new (&(c->ageMap)) Segment::Map
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(&(c->gen1), log(TenureThreshold), 1, 0, false);
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new (&(c->gen1)) Segment(c, minimum, desired, &(c->ageMap));
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if (Verbose) {
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fprintf(stderr, "init gen1 to %d bytes\n",
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c->gen1.capacity() * BytesPerWord);
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}
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}
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void
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initNextGen1(Context* c)
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{
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unsigned minimum = MinimumGen1SizeInBytes / BytesPerWord;
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unsigned desired = max(minimum, avg(c->gen1.position(), c->gen1.capacity()));
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new (&(c->nextAgeMap)) Segment::Map
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(&(c->nextGen1), log(TenureThreshold), 1, 0, false);
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|
||||
new (&(c->nextGen1)) Segment(c, minimum, desired, &(c->nextAgeMap));
|
||||
unsigned minimum
|
||||
= (c->gen1.position() - c->tenureFootprint) + footprint + c->gen1padding;
|
||||
unsigned desired = minimum;
|
||||
|
||||
new (&(c->nextGen1)) Segment(c, &(c->nextAgeMap), desired, minimum);
|
||||
|
||||
if (Verbose) {
|
||||
fprintf(stderr, "init nextGen1 to %d bytes\n",
|
||||
@ -651,40 +495,23 @@ initNextGen1(Context* c)
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
initGen2(Context* c)
|
||||
{
|
||||
unsigned minimum = MinimumGen2SizeInBytes / BytesPerWord;
|
||||
unsigned desired = minimum;
|
||||
|
||||
new (&(c->pointerMap)) Segment::Map(&(c->gen2));
|
||||
new (&(c->pageMap)) Segment::Map
|
||||
(&(c->gen2), 1, LikelyPageSizeInBytes / BytesPerWord, &(c->pointerMap));
|
||||
new (&(c->heapMap)) Segment::Map
|
||||
(&(c->gen2), 1, c->pageMap.scale * 1024, &(c->pageMap));
|
||||
|
||||
new (&(c->gen2)) Segment(c, minimum, desired, &(c->heapMap));
|
||||
|
||||
if (Verbose) {
|
||||
fprintf(stderr, "init gen2 to %d bytes\n",
|
||||
c->gen2.capacity() * BytesPerWord);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
inline void
|
||||
initNextGen2(Context* c)
|
||||
{
|
||||
unsigned minimum = MinimumGen2SizeInBytes / BytesPerWord;
|
||||
unsigned desired = max(minimum, avg(c->gen2.position(), c->gen2.capacity()));
|
||||
new (&(c->nextPointerMap)) Segment::Map
|
||||
(&(c->nextGen2), 1, 1, 0, true);
|
||||
|
||||
new (&(c->nextPointerMap)) Segment::Map(&(c->nextGen2));
|
||||
new (&(c->nextPageMap)) Segment::Map
|
||||
(&(c->nextGen2), 1, LikelyPageSizeInBytes / BytesPerWord,
|
||||
&(c->nextPointerMap));
|
||||
new (&(c->nextHeapMap)) Segment::Map
|
||||
(&(c->nextGen2), 1, c->pageMap.scale * 1024, &(c->nextPageMap));
|
||||
&(c->nextPointerMap), true);
|
||||
|
||||
new (&(c->nextGen2)) Segment(c, minimum, desired, &(c->nextHeapMap));
|
||||
new (&(c->nextHeapMap)) Segment::Map
|
||||
(&(c->nextGen2), 1, c->pageMap.scale * 1024, &(c->nextPageMap), true);
|
||||
|
||||
unsigned minimum = c->gen2.position() + c->tenureFootprint + c->gen2padding;
|
||||
unsigned desired = minimum * 2;
|
||||
|
||||
new (&(c->nextGen2)) Segment(c, &(c->nextHeapMap), desired, minimum);
|
||||
|
||||
if (Verbose) {
|
||||
fprintf(stderr, "init nextGen2 to %d bytes\n",
|
||||
@ -730,25 +557,7 @@ bitset(Context* c, object o)
|
||||
inline object
|
||||
copyTo(Context* c, Segment* s, object o, unsigned size)
|
||||
{
|
||||
if (s->remaining() < size) {
|
||||
s->ensure(size);
|
||||
|
||||
if (Verbose) {
|
||||
if (s == &(c->gen2)) {
|
||||
fprintf(stderr, "grow gen2 to %d bytes\n",
|
||||
c->gen2.capacity() * BytesPerWord);
|
||||
} else if (s == &(c->nextGen1)) {
|
||||
fprintf(stderr, "grow nextGen1 to %d bytes\n",
|
||||
c->nextGen1.capacity() * BytesPerWord);
|
||||
} else if (s == &(c->nextGen2)) {
|
||||
fprintf(stderr, "grow nextGen2 to %d bytes\n",
|
||||
c->nextGen2.capacity() * BytesPerWord);
|
||||
} else {
|
||||
abort(c);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
assert(c, s->remaining() >= size);
|
||||
object dst = s->allocate(size);
|
||||
c->client->copy(o, dst);
|
||||
return dst;
|
||||
@ -760,37 +569,31 @@ copy2(Context* c, object o)
|
||||
unsigned size = c->client->copiedSizeInWords(o);
|
||||
|
||||
if (c->gen2.contains(o)) {
|
||||
assert(c, c->mode == MajorCollection
|
||||
or c->mode == Gen2Collection);
|
||||
assert(c, c->mode == Heap::MajorCollection);
|
||||
|
||||
return copyTo(c, &(c->nextGen2), o, size);
|
||||
} else if (c->gen1.contains(o)) {
|
||||
unsigned age = c->ageMap.get(o);
|
||||
if (age == TenureThreshold) {
|
||||
if (c->mode == MinorCollection) {
|
||||
if (c->gen2.front == 0) initGen2(c);
|
||||
if (c->mode == Heap::MinorCollection) {
|
||||
assert(c, c->gen2.remaining() >= size);
|
||||
|
||||
if (c->gen2.remaining() >= size) {
|
||||
if (c->gen2Base == Top) {
|
||||
c->gen2Base = c->gen2.position();
|
||||
}
|
||||
|
||||
return copyTo(c, &(c->gen2), o, size);
|
||||
} else {
|
||||
if (Verbose) {
|
||||
fprintf(stderr, "overflow collection\n");
|
||||
}
|
||||
|
||||
c->mode = OverflowCollection;
|
||||
initNextGen2(c);
|
||||
return copyTo(c, &(c->nextGen2), o, size);
|
||||
}
|
||||
} else {
|
||||
return copyTo(c, &(c->nextGen2), o, size);
|
||||
}
|
||||
} else {
|
||||
o = copyTo(c, &(c->nextGen1), o, size);
|
||||
|
||||
c->nextAgeMap.setOnly(o, age + 1);
|
||||
if (age + 1 == TenureThreshold) {
|
||||
c->tenureFootprint += size;
|
||||
}
|
||||
|
||||
return o;
|
||||
}
|
||||
} else {
|
||||
@ -836,28 +639,10 @@ update3(Context* c, object o, bool* needsVisit)
|
||||
object
|
||||
update2(Context* c, object o, bool* needsVisit)
|
||||
{
|
||||
switch (c->mode) {
|
||||
case MinorCollection:
|
||||
case OverflowCollection:
|
||||
if (c->gen2.contains(o)) {
|
||||
if (c->mode == Heap::MinorCollection and c->gen2.contains(o)) {
|
||||
*needsVisit = false;
|
||||
return o;
|
||||
}
|
||||
break;
|
||||
|
||||
case Gen2Collection:
|
||||
if (c->gen2.contains(o)) {
|
||||
return update3(c, o, needsVisit);
|
||||
} else {
|
||||
assert(c, c->nextGen1.contains(o) or c->nextGen2.contains(o));
|
||||
|
||||
*needsVisit = false;
|
||||
return o;
|
||||
}
|
||||
break;
|
||||
|
||||
default: break;
|
||||
}
|
||||
|
||||
return update3(c, o, needsVisit);
|
||||
}
|
||||
@ -874,7 +659,7 @@ update(Context* c, object* p, bool* needsVisit)
|
||||
|
||||
// update heap map.
|
||||
if (r) {
|
||||
if (c->mode == MinorCollection) {
|
||||
if (c->mode == Heap::MinorCollection) {
|
||||
if (c->gen2.contains(p) and not c->gen2.contains(r)) {
|
||||
if (Debug) {
|
||||
fprintf(stderr, "mark %p (%s) at %p (%s)\n",
|
||||
@ -1204,7 +989,7 @@ collect(Context* c, Segment::Map* map, unsigned start, unsigned end,
|
||||
map->clearOnly(s);
|
||||
bool childDirty = false;
|
||||
collect(c, map->child, s, e, &childDirty, true);
|
||||
if (c->mode != OverflowCollection and childDirty) {
|
||||
if (childDirty) {
|
||||
map->setOnly(s);
|
||||
*dirty = true;
|
||||
}
|
||||
@ -1219,7 +1004,7 @@ collect(Context* c, Segment::Map* map, unsigned start, unsigned end,
|
||||
} else {
|
||||
collect(c, p);
|
||||
|
||||
if (c->mode != OverflowCollection and not c->gen2.contains(*p)) {
|
||||
if (not c->gen2.contains(*p)) {
|
||||
map->setOnly(p);
|
||||
*dirty = true;
|
||||
}
|
||||
@ -1230,78 +1015,19 @@ collect(Context* c, Segment::Map* map, unsigned start, unsigned end,
|
||||
assert(c, wasDirty or not expectDirty);
|
||||
}
|
||||
|
||||
class ObjectSegmentIterator {
|
||||
public:
|
||||
Context* context;
|
||||
Segment::Chain* chain;
|
||||
unsigned index;
|
||||
unsigned end;
|
||||
bool dirty;
|
||||
|
||||
ObjectSegmentIterator(Segment* segment, unsigned end):
|
||||
context(segment->context),
|
||||
chain(segment->front),
|
||||
index(0),
|
||||
end(end),
|
||||
dirty(false)
|
||||
{ }
|
||||
|
||||
bool hasNext() {
|
||||
if (dirty) {
|
||||
dirty = false;
|
||||
uintptr_t* p = chain->data() + index;
|
||||
index += context->client->sizeInWords(p);
|
||||
}
|
||||
|
||||
if (chain and index == chain->position) {
|
||||
chain = chain->next;
|
||||
index = 0;
|
||||
}
|
||||
|
||||
return chain and index + chain->offset < end;
|
||||
}
|
||||
|
||||
object next() {
|
||||
dirty = true;
|
||||
return chain->data() + index;
|
||||
}
|
||||
};
|
||||
|
||||
void
|
||||
collect(Context* c, Segment* s, unsigned limit)
|
||||
{
|
||||
for (ObjectSegmentIterator it(s, limit); it.hasNext();) {
|
||||
object p = it.next();
|
||||
|
||||
class Walker : public Heap::Walker {
|
||||
public:
|
||||
Walker(Context* c, object p): c(c), p(p) { }
|
||||
|
||||
virtual bool visit(unsigned offset) {
|
||||
collect(c, getp(p, offset));
|
||||
return true;
|
||||
}
|
||||
|
||||
Context* c;
|
||||
object p;
|
||||
} walker(c, p);
|
||||
|
||||
c->client->walk(p, &walker);
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
collect2(Context* c)
|
||||
{
|
||||
if (c->mode == MinorCollection and c->gen2.position()) {
|
||||
c->gen2Base = Top;
|
||||
c->tenureFootprint = 0;
|
||||
c->gen1padding = 0;
|
||||
c->gen2padding = 0;
|
||||
|
||||
if (c->mode == Heap::MinorCollection and c->gen2.position()) {
|
||||
unsigned start = 0;
|
||||
unsigned end = start + c->gen2.position();
|
||||
bool dirty;
|
||||
collect(c, &(c->heapMap), start, end, &dirty, false);
|
||||
} else if (c->mode == Gen2Collection) {
|
||||
unsigned ng2Position = c->nextGen2.position();
|
||||
collect(c, &(c->nextGen1), c->nextGen1.position());
|
||||
collect(c, &(c->nextGen2), ng2Position);
|
||||
}
|
||||
|
||||
class Visitor : public Heap::Visitor {
|
||||
@ -1319,58 +1045,30 @@ collect2(Context* c)
|
||||
}
|
||||
|
||||
void
|
||||
collect(Context* c)
|
||||
collect(Context* c, unsigned footprint)
|
||||
{
|
||||
if (c->gen1.front == 0) initGen1(c);
|
||||
|
||||
c->gen2Base = Top;
|
||||
|
||||
switch (c->mode) {
|
||||
case MinorCollection: {
|
||||
initNextGen1(c);
|
||||
if (c->tenureFootprint > c->gen2.remaining()) {
|
||||
c->mode = Heap::MajorCollection;
|
||||
}
|
||||
|
||||
if (Verbose) {
|
||||
if (c->mode == Heap::MajorCollection) {
|
||||
fprintf(stderr, "major collection\n");
|
||||
} else {
|
||||
fprintf(stderr, "minor collection\n");
|
||||
}
|
||||
|
||||
collect2(c);
|
||||
|
||||
if (c->mode == OverflowCollection) {
|
||||
c->mode = Gen2Collection;
|
||||
|
||||
if (Verbose) {
|
||||
fprintf(stderr, "gen2 collection\n");
|
||||
}
|
||||
|
||||
c->gen2Base = Top;
|
||||
|
||||
collect2(c);
|
||||
|
||||
c->gen2.replaceWith(&(c->nextGen2));
|
||||
}
|
||||
|
||||
c->gen1.replaceWith(&(c->nextGen1));
|
||||
} break;
|
||||
|
||||
case MajorCollection: {
|
||||
initNextGen1(c);
|
||||
initNextGen1(c, footprint);
|
||||
if (c->mode == Heap::MajorCollection) {
|
||||
initNextGen2(c);
|
||||
|
||||
if (c->gen2.position()) {
|
||||
c->heapMap.clear();
|
||||
}
|
||||
|
||||
if (Verbose) {
|
||||
fprintf(stderr, "major collection\n");
|
||||
}
|
||||
|
||||
collect2(c);
|
||||
|
||||
c->gen1.replaceWith(&(c->nextGen1));
|
||||
if (c->mode == Heap::MajorCollection) {
|
||||
c->gen2.replaceWith(&(c->nextGen2));
|
||||
} break;
|
||||
|
||||
default: abort(c);
|
||||
}
|
||||
}
|
||||
|
||||
@ -1378,22 +1076,12 @@ class MyHeap: public Heap {
|
||||
public:
|
||||
MyHeap(System* system): c(system) { }
|
||||
|
||||
virtual void collect(CollectionType type, Client* client) {
|
||||
switch (type) {
|
||||
case MinorCollection:
|
||||
c.mode = ::MinorCollection;
|
||||
break;
|
||||
|
||||
case MajorCollection:
|
||||
c.mode = ::MajorCollection;
|
||||
break;
|
||||
|
||||
default: abort(&c);
|
||||
}
|
||||
|
||||
virtual void collect(CollectionType type, Client* client, unsigned footprint)
|
||||
{
|
||||
c.mode = type;
|
||||
c.client = client;
|
||||
|
||||
::collect(&c);
|
||||
::collect(&c, footprint);
|
||||
}
|
||||
|
||||
virtual bool needsMark(void** p) {
|
||||
@ -1409,9 +1097,18 @@ class MyHeap: public Heap {
|
||||
c.heapMap.set(p);
|
||||
}
|
||||
|
||||
virtual void dispose() {
|
||||
c.dispose();
|
||||
c.system->free(this);
|
||||
virtual void pad(void* p, unsigned extra) {
|
||||
if (c.gen1.contains(p)) {
|
||||
if (c.ageMap.get(p) == TenureThreshold) {
|
||||
c.gen2padding += extra;
|
||||
} else {
|
||||
c.gen1padding += extra;
|
||||
}
|
||||
} else if (c.gen2.contains(p)) {
|
||||
c.gen2padding += extra;
|
||||
} else {
|
||||
c.gen1padding += extra;
|
||||
}
|
||||
}
|
||||
|
||||
virtual void* follow(void* p) {
|
||||
@ -1437,8 +1134,7 @@ class MyHeap: public Heap {
|
||||
return Reachable;
|
||||
} else if (c.nextGen2.contains(p)
|
||||
or (c.gen2.contains(p)
|
||||
and (c.mode == ::MinorCollection
|
||||
or c.mode == ::OverflowCollection
|
||||
and (c.mode == Heap::MinorCollection
|
||||
or c.gen2.indexOf(p) >= c.gen2Base)))
|
||||
{
|
||||
return Tenured;
|
||||
@ -1450,11 +1146,12 @@ class MyHeap: public Heap {
|
||||
}
|
||||
|
||||
virtual CollectionType collectionType() {
|
||||
if (c.mode == ::MinorCollection) {
|
||||
return MinorCollection;
|
||||
} else {
|
||||
return MajorCollection;
|
||||
return c.mode;
|
||||
}
|
||||
|
||||
virtual void dispose() {
|
||||
c.dispose();
|
||||
c.system->free(this);
|
||||
}
|
||||
|
||||
Context c;
|
||||
|
||||
@ -42,9 +42,11 @@ class Heap {
|
||||
};
|
||||
|
||||
virtual ~Heap() { }
|
||||
virtual void collect(CollectionType type, Client* client) = 0;
|
||||
virtual void collect(CollectionType type, Client* client, unsigned footprint)
|
||||
= 0;
|
||||
virtual bool needsMark(void** p) = 0;
|
||||
virtual void mark(void** p) = 0;
|
||||
virtual void pad(void* p, unsigned extra) = 0;
|
||||
virtual void* follow(void* p) = 0;
|
||||
virtual Status status(void* p) = 0;
|
||||
virtual CollectionType collectionType() = 0;
|
||||
|
||||
@ -111,6 +111,23 @@ killZombies(Thread* t, Thread* o)
|
||||
}
|
||||
}
|
||||
|
||||
unsigned
|
||||
footprint(Thread* t)
|
||||
{
|
||||
unsigned n = t->heapIndex;
|
||||
|
||||
if (t->large) {
|
||||
n += extendedSize
|
||||
(t, t->large, baseSize(t, t->large, objectClass(t, t->large)));
|
||||
}
|
||||
|
||||
for (Thread* c = t->child; c; c = c->peer) {
|
||||
n += footprint(c);
|
||||
}
|
||||
|
||||
return n;
|
||||
}
|
||||
|
||||
void
|
||||
visitRoots(Thread* t, Heap::Visitor* v)
|
||||
{
|
||||
@ -2498,7 +2515,7 @@ collect(Thread* t, Heap::CollectionType type)
|
||||
} it(m);
|
||||
|
||||
m->unsafe = true;
|
||||
m->heap->collect(type, &it);
|
||||
m->heap->collect(type, &it, footprint(m->rootThread));
|
||||
m->unsafe = false;
|
||||
|
||||
postCollect(m->rootThread);
|
||||
|
||||
@ -1885,6 +1885,9 @@ markHashTaken(Thread* t, object o)
|
||||
{
|
||||
assert(t, not objectExtended(t, o));
|
||||
cast<uintptr_t>(o, 0) |= HashTakenMark;
|
||||
|
||||
ACQUIRE_RAW(t, t->vm->heapLock);
|
||||
t->vm->heap->pad(o, 1);
|
||||
}
|
||||
|
||||
inline uint32_t
|
||||
|
||||
@ -38,7 +38,7 @@ usageAndExit(const char* name)
|
||||
int
|
||||
main(int ac, const char** av)
|
||||
{
|
||||
unsigned heapSize = 4 * 1024 * 1024;
|
||||
unsigned heapSize = 128 * 1024 * 1024;
|
||||
const char* path = ".";
|
||||
const char* class_ = 0;
|
||||
int argc = 0;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user