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6819061: G1: eliminate serial Other times that are proportional to the collection set length

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6871109: G1: remove the concept of the scan only prefix

Removed scan only regions and associated code. The young portion of the collection set is now constructed incrementally - when a young region is retired as the current allocation region it is added to the collection set.

Reviewed-by: apetrusenko, iveresov, tonyp
This commit is contained in:
John Cuthbertson 2010-04-22 10:02:38 -07:00
parent db6aad1e4e
commit b1867e0dd5
12 changed files with 895 additions and 1013 deletions
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42
hotspot/src/share/vm/gc_implementation/g1/heapRegion.hpp
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@ -1,5 +1,5 @@
/*
* Copyright 2001-2009 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 2001-2010 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -247,7 +247,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
enum YoungType {
NotYoung, // a region is not young
ScanOnly, // a region is young and scan-only
Young, // a region is young
Survivor // a region is young and it contains
// survivor
@ -292,6 +291,20 @@ class HeapRegion: public G1OffsetTableContigSpace {
_young_type = new_type;
}
// Cached attributes used in the collection set policy information
// The RSet length that was added to the total value
// for the collection set.
size_t _recorded_rs_length;
// The predicted elapsed time that was added to total value
// for the collection set.
double _predicted_elapsed_time_ms;
// The predicted number of bytes to copy that was added to
// the total value for the collection set.
size_t _predicted_bytes_to_copy;
public:
// If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros.
HeapRegion(G1BlockOffsetSharedArray* sharedOffsetArray,
@ -614,7 +627,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
// </PREDICTION>
bool is_young() const { return _young_type != NotYoung; }
bool is_scan_only() const { return _young_type == ScanOnly; }
bool is_survivor() const { return _young_type == Survivor; }
int young_index_in_cset() const { return _young_index_in_cset; }
@ -629,12 +641,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
return _surv_rate_group->age_in_group(_age_index);
}
void recalculate_age_in_surv_rate_group() {
assert( _surv_rate_group != NULL, "pre-condition" );
assert( _age_index > -1, "pre-condition" );
_age_index = _surv_rate_group->recalculate_age_index(_age_index);
}
void record_surv_words_in_group(size_t words_survived) {
assert( _surv_rate_group != NULL, "pre-condition" );
assert( _age_index > -1, "pre-condition" );
@ -676,8 +682,6 @@ class HeapRegion: public G1OffsetTableContigSpace {
void set_young() { set_young_type(Young); }
void set_scan_only() { set_young_type(ScanOnly); }
void set_survivor() { set_young_type(Survivor); }
void set_not_young() { set_young_type(NotYoung); }
@ -775,6 +779,22 @@ class HeapRegion: public G1OffsetTableContigSpace {
_zero_filler = NULL;
}
size_t recorded_rs_length() const { return _recorded_rs_length; }
double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; }
size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; }
void set_recorded_rs_length(size_t rs_length) {
_recorded_rs_length = rs_length;
}
void set_predicted_elapsed_time_ms(double ms) {
_predicted_elapsed_time_ms = ms;
}
void set_predicted_bytes_to_copy(size_t bytes) {
_predicted_bytes_to_copy = bytes;
}
#define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \
virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl);
SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL)