git: kernel - Fix swap space leak

Matthew Dillon dillon at
Tue Dec 27 14:18:12 PST 2011

commit 0301c407992b4e73ffebb89e08bfc1efe3c4bec6
Author: Matthew Dillon <dillon at>
Date:   Tue Dec 27 14:15:50 2011 -0800

    kernel - Fix swap space leak
    * swp_pager_meta_free_callback() had a bug where the last swap block
      in the swblock{} structure was not being freed from the swap bitmap.
    * Also fix two rare race conditions.  swp_pager_freeswapspace() can
      block, causing the VM object token to be temporarily unlocked.  Deal
      with the race by not decrementing the swb_count field until after
      swp_pager_freeswapspace() is called.
    Reported-by: sephe

Summary of changes:
 sys/vm/swap_pager.c |   33 ++++++++++++++++++++++++---------
 1 files changed, 24 insertions(+), 9 deletions(-)

DragonFly BSD source repository

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