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From: Matt Dillon <dillon@FreeBSD.ORG>
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Date: Thu, 21 Jan 1999 01:33:09 -0800 (PST)
Message-Id: <199901210933.BAA21202@freefall.freebsd.org>
To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
Subject: cvs commit: src/sys/vm default_pager.c swap_pager.c
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dillon      1999/01/21 01:33:09 PST

  Modified files:
    sys/vm               default_pager.c swap_pager.c 
  Log:
      The default_pager's interaction with the swap_pager has been reorganized,
      and the swap_pager has been completely replaced.
  
      The new swap pager uses the new blist radix-tree based bitmap allocator
      for low level swap allocation and deallocation.   The new allocator
      is effectively O(5) while the old one was O(N), and the new allocator
      allocates all required memory at init time rather then at allocate
      memory on the fly at run time.
  
      Swap metadata is allocated in clusters and stored in a hash table,
      eliminating linearly allocated structures.
  
      Many, many features have been rewritten or added.  Swap space is now
      reallocated on the fly providing a poor-mans auto defragmentation of
      swap space.  Swap space that is no longer needed is freed on a timely
      basis so no garbage collection is necessary.
  
      Swap I/O is marked B_ASYNC and NFS has been fixed to do the right
      thing with it, so NFS-based paging now has around 10x the performance
      as it did before ( previously NFS enforced synchronous I/O for paging ).
  
  Revision  Changes    Path
  1.18      +1 -1      src/sys/vm/default_pager.c
  1.109     +1 -1      src/sys/vm/swap_pager.c

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