src/share/vm/gc/shared/plab.cpp

*** 1,7 ****
  /*
!  * Copyright (c) 2001, 2016, 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.
--- 1,7 ----
  /*
!  * Copyright (c) 2001, 2017, 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.
*** 152,161 ****
--- 152,172 ----
    }
  
    assert(is_object_aligned(max_size()) && min_size() <= max_size(),
           "PLAB clipping computation may be incorrect");
  
+   size_t plab_sz = adjust_desired_plab_sz_helper();
+   // Take historical weighted average
+   _filter.sample(plab_sz);
+   _desired_net_plab_sz = MAX2(min_size(), (size_t)_filter.average());
+ 
+   log_sizing(plab_sz, _desired_net_plab_sz);
+   // Clear accumulators for next round
+   reset();
+ }
+ 
+ size_t PLABStats::adjust_desired_plab_sz_helper() {
    if (_allocated == 0) {
      assert(_unused == 0,
             "Inconsistency in PLAB stats: "
             "_allocated: " SIZE_FORMAT ", "
             "_wasted: " SIZE_FORMAT ", "
*** 171,183 ****
      target_refills = 1;
    }
    size_t used = _allocated - _wasted - _unused;
    // Assumed to have 1 gc worker thread
    size_t recent_plab_sz = used / target_refills;
!   // Take historical weighted average
!   _filter.sample(recent_plab_sz);
!   _desired_net_plab_sz = MAX2(min_size(), (size_t)_filter.average());
! 
!   log_sizing(recent_plab_sz, _desired_net_plab_sz);
! 
!   reset();
  }
--- 182,188 ----
      target_refills = 1;
    }
    size_t used = _allocated - _wasted - _unused;
    // Assumed to have 1 gc worker thread
    size_t recent_plab_sz = used / target_refills;
!   return recent_plab_sz;
  }