cvs commit: src/sys/kern vfs_bio.c

[Tor Egge]

tegge       2006-03-08 23:57:07 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_6)
    sys/kern             vfs_bio.c 
  Log:
  MFC: For low memory situations, non-VMIO buffers didnt't release pages back
       to the system when brelse() was called with B_RELBUF set on the buffer.
       This could be a problem when the system was low on memory, had many
       buffers on QUEUE_EMPTYKVA and started to traverse directories.  For
       each getnewbuf(), pages were allocated from the system, driving the
       free reserve downwards. For each brelse(), the system put the buffer
       on QUEUE_CLEAN, with B_INVAL set.
  
       This commit changes the semantics of B_RELBUF to also free pages from
       non-VMIO buffers.
  
  Approved by:    re (mux)
  
  Revision   Changes    Path
  1.491.2.6  +5 -0      src/sys/kern/vfs_bio.c