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src/share/vm/gc_implementation/g1/g1RegionToSpaceMapper.hpp
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rev 7746 : 8058354: SPECjvm2008-Derby -2.7% performance regression on Solaris-X64 starting with 9-b29
Summary: Allow partial use of large pages for auxiliary data structures in G1.
Reviewed-by:
@@ -1,7 +1,7 @@
/*
- * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2014, 2015 Oracle and/or its affiliates. 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
@@ -49,11 +49,11 @@
size_t _commit_granularity;
size_t _region_granularity;
// Mapping management
BitMap _commit_map;
- G1RegionToSpaceMapper(ReservedSpace rs, size_t commit_granularity, size_t region_granularity, MemoryType type);
+ G1RegionToSpaceMapper(ReservedSpace rs, size_t actual_size, size_t commit_granularity, size_t region_granularity, MemoryType type);
void fire_on_commit(uint start_idx, size_t num_regions, bool zero_filled);
public:
MemRegion reserved() { return _storage.reserved(); }
@@ -69,15 +69,19 @@
virtual void commit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;
virtual void uncommit_regions(uintptr_t start_idx, size_t num_regions = 1) = 0;
// Creates an appropriate G1RegionToSpaceMapper for the given parameters.
+ // The actual space to be used within the given reservation is given by actual_size.
+ // This is because some OSes need to round up the reservation size to guarantee
+ // alignment of os_commit_granularity.
// The byte_translation_factor defines how many bytes in a region correspond to
// a single byte in the data structure this mapper is for.
// Eg. in the card table, this value corresponds to the size a single card
- // table entry corresponds to.
+ // table entry corresponds to in the heap.
static G1RegionToSpaceMapper* create_mapper(ReservedSpace rs,
+ size_t actual_size,
size_t os_commit_granularity,
size_t region_granularity,
size_t byte_translation_factor,
MemoryType type);
};
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