jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/shared/mutableNUMASpace.hpp@097d78aaf2b5 (annotated)

src/share/vm/gc_implementation/shared/mutableNUMASpace.hpp@097d78aaf2b5 (annotated)

src/share/vm/gc_implementation/shared/mutableNUMASpace.hpp

Thu, 04 Oct 2012 10:40:23 -0700

author: jmasa
date: Thu, 04 Oct 2012 10:40:23 -0700
changeset 4131: 097d78aaf2b5
parent 3900: d2a62e0f25eb
child 4542: db9981fd3124
permissions: -rw-r--r--

7198873: NPG: VM Does not unload classes with UseConcMarkSweepGC
Reviewed-by: johnc, mgerdin, jwilhelm

 /*
  * Copyright (c) 2006, 2012, 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.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLENUMASPACE_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLENUMASPACE_HPP
 #ifndef SERIALGC
 #include "gc_implementation/shared/gcUtil.hpp"
 #include "gc_implementation/shared/mutableSpace.hpp"
 #endif
 /*
  *    The NUMA-aware allocator (MutableNUMASpace) is basically a modification
  * of MutableSpace which preserves interfaces but implements different
  * functionality. The space is split into chunks for each locality group
  * (resizing for adaptive size policy is also supported). For each thread
  * allocations are performed in the chunk corresponding to the home locality
  * group of the thread. Whenever any chunk fills-in the young generation
  * collection occurs.
  *   The chunks can be also be adaptively resized. The idea behind the adaptive
  * sizing is to reduce the loss of the space in the eden due to fragmentation.
  * The main cause of fragmentation is uneven allocation rates of threads.
  * The allocation rate difference between locality groups may be caused either by
  * application specifics or by uneven LWP distribution by the OS. Besides,
  * application can have less threads then the number of locality groups.
  * In order to resize the chunk we measure the allocation rate of the
  * application between collections. After that we reshape the chunks to reflect
  * the allocation rate pattern. The AdaptiveWeightedAverage exponentially
  * decaying average is used to smooth the measurements. The NUMASpaceResizeRate
  * parameter is used to control the adaptation speed by restricting the number of
  * bytes that can be moved during the adaptation phase.
  *   Chunks may contain pages from a wrong locality group. The page-scanner has
  * been introduced to address the problem. Remote pages typically appear due to
  * the memory shortage in the target locality group. Besides Solaris would
  * allocate a large page from the remote locality group even if there are small
  * local pages available. The page-scanner scans the pages right after the
  * collection and frees remote pages in hope that subsequent reallocation would
  * be more successful. This approach proved to be useful on systems with high
  * load where multiple processes are competing for the memory.
  */
 class MutableNUMASpace : public MutableSpace {
   friend class VMStructs;
   class LGRPSpace : public CHeapObj<mtGC> {
     int _lgrp_id;
     MutableSpace* _space;
     MemRegion _invalid_region;
     AdaptiveWeightedAverage *_alloc_rate;
     bool _allocation_failed;
     struct SpaceStats {
       size_t _local_space, _remote_space, _unbiased_space, _uncommited_space;
       size_t _large_pages, _small_pages;
       SpaceStats() {
         _local_space = 0;
         _remote_space = 0;
         _unbiased_space = 0;
         _uncommited_space = 0;
         _large_pages = 0;
         _small_pages = 0;
       }
     };
     SpaceStats _space_stats;
     char* _last_page_scanned;
     char* last_page_scanned()            { return _last_page_scanned; }
     void set_last_page_scanned(char* p)  { _last_page_scanned = p;    }
    public:
     LGRPSpace(int l, size_t alignment) : _lgrp_id(l), _last_page_scanned(NULL), _allocation_failed(false) {
       _space = new MutableSpace(alignment);
       _alloc_rate = new AdaptiveWeightedAverage(NUMAChunkResizeWeight);
     }
     ~LGRPSpace() {
       delete _space;
       delete _alloc_rate;
     }
     void add_invalid_region(MemRegion r) {
       if (!_invalid_region.is_empty()) {
       _invalid_region.set_start(MIN2(_invalid_region.start(), r.start()));
       _invalid_region.set_end(MAX2(_invalid_region.end(), r.end()));
       } else {
       _invalid_region = r;
       }
     }
     static bool equals(void* lgrp_id_value, LGRPSpace* p) {
       return *(int*)lgrp_id_value == p->lgrp_id();
     }
     // Report a failed allocation.
     void set_allocation_failed() { _allocation_failed = true;  }
     void sample() {
       // If there was a failed allocation make allocation rate equal
       // to the size of the whole chunk. This ensures the progress of
       // the adaptation process.
       size_t alloc_rate_sample;
       if (_allocation_failed) {
         alloc_rate_sample = space()->capacity_in_bytes();
         _allocation_failed = false;
       } else {
         alloc_rate_sample = space()->used_in_bytes();
       }
       alloc_rate()->sample(alloc_rate_sample);
     }
     MemRegion invalid_region() const                { return _invalid_region;      }
     void set_invalid_region(MemRegion r)            { _invalid_region = r;         }
     int lgrp_id() const                             { return _lgrp_id;             }
     MutableSpace* space() const                     { return _space;               }
     AdaptiveWeightedAverage* alloc_rate() const     { return _alloc_rate;          }
     void clear_alloc_rate()                         { _alloc_rate->clear();        }
     SpaceStats* space_stats()                       { return &_space_stats;        }
     void clear_space_stats()                        { _space_stats = SpaceStats(); }
     void accumulate_statistics(size_t page_size);
     void scan_pages(size_t page_size, size_t page_count);
   };
   GrowableArray<LGRPSpace*>* _lgrp_spaces;
   size_t _page_size;
   unsigned _adaptation_cycles, _samples_count;
   void set_page_size(size_t psz)                     { _page_size = psz;          }
   size_t page_size() const                           { return _page_size;         }
   unsigned adaptation_cycles()                       { return _adaptation_cycles; }
   void set_adaptation_cycles(int v)                  { _adaptation_cycles = v;    }
   unsigned samples_count()                           { return _samples_count;     }
   void increment_samples_count()                     { ++_samples_count;          }
   size_t _base_space_size;
   void set_base_space_size(size_t v)                 { _base_space_size = v;      }
   size_t base_space_size() const                     { return _base_space_size;   }
   // Check if the NUMA topology has changed. Add and remove spaces if needed.
   // The update can be forced by setting the force parameter equal to true.
   bool update_layout(bool force);
   // Bias region towards the lgrp.
   void bias_region(MemRegion mr, int lgrp_id);
   // Free pages in a given region.
   void free_region(MemRegion mr);
   // Get current chunk size.
   size_t current_chunk_size(int i);
   // Get default chunk size (equally divide the space).
   size_t default_chunk_size();
   // Adapt the chunk size to follow the allocation rate.
   size_t adaptive_chunk_size(int i, size_t limit);
   // Scan and free invalid pages.
   void scan_pages(size_t page_count);
   // Return the bottom_region and the top_region. Align them to page_size() boundary.
   // |------------------new_region---------------------------------|
   // |----bottom_region--|---intersection---|------top_region------|
   void select_tails(MemRegion new_region, MemRegion intersection,
                     MemRegion* bottom_region, MemRegion *top_region);
   // Try to merge the invalid region with the bottom or top region by decreasing
   // the intersection area. Return the invalid_region aligned to the page_size()
   // boundary if it's inside the intersection. Return non-empty invalid_region
   // if it lies inside the intersection (also page-aligned).
   // |------------------new_region---------------------------------|
   // |----------------|-------invalid---|--------------------------|
   // |----bottom_region--|---intersection---|------top_region------|
   void merge_regions(MemRegion new_region, MemRegion* intersection,
                      MemRegion *invalid_region);
  public:
   GrowableArray<LGRPSpace*>* lgrp_spaces() const     { return _lgrp_spaces;       }
   MutableNUMASpace(size_t alignment);
   virtual ~MutableNUMASpace();
   // Space initialization.
   virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space, bool setup_pages = SetupPages);
   // Update space layout if necessary. Do all adaptive resizing job.
   virtual void update();
   // Update allocation rate averages.
   virtual void accumulate_statistics();
   virtual void clear(bool mangle_space);
   virtual void mangle_unused_area() PRODUCT_RETURN;
   virtual void mangle_unused_area_complete() PRODUCT_RETURN;
   virtual void mangle_region(MemRegion mr) PRODUCT_RETURN;
   virtual void check_mangled_unused_area(HeapWord* limit) PRODUCT_RETURN;
   virtual void check_mangled_unused_area_complete() PRODUCT_RETURN;
   virtual void set_top_for_allocations(HeapWord* v) PRODUCT_RETURN;
   virtual void set_top_for_allocations() PRODUCT_RETURN;
   virtual void ensure_parsability();
   virtual size_t used_in_words() const;
   virtual size_t free_in_words() const;
   using MutableSpace::capacity_in_words;
   virtual size_t capacity_in_words(Thread* thr) const;
   virtual size_t tlab_capacity(Thread* thr) const;
   virtual size_t unsafe_max_tlab_alloc(Thread* thr) const;
   // Allocation (return NULL if full)
   virtual HeapWord* allocate(size_t word_size);
   virtual HeapWord* cas_allocate(size_t word_size);
   // Debugging
   virtual void print_on(outputStream* st) const;
   virtual void print_short_on(outputStream* st) const;
   virtual void verify();
   virtual void set_top(HeapWord* value);
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_MUTABLENUMASPACE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/shared/mutableNUMASpace.hpp@097d78aaf2b5 (annotated)

src/share/vm/gc_implementation/shared/mutableNUMASpace.hpp