DragonFly BSD
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cvs commit: src/sys/i386/i386 pmap.c

From: Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 26 May 2004 16:34:25 -0700 (PDT)

dillon      2004/05/26 16:34:25 PDT

DragonFly src repository

  Modified files:
    sys/i386/i386        pmap.c 
  Mask bits properly for pte_prot() in case it is called with additional
  VM_PROT_ bits.
  Fix a wired memory leak bug in pmap_enter().  If a page wiring change is
  made and the page has already been faulted in for read access, and a
  write-fault occurs, pmap_enter() was losing track of the wiring count in
  the pmap when it tried to optimize the RO->RW case in the page table.
  This prevented the page table page from being freed and led to a memory leak.
  The case is easily reproducable if you attempt to wire the data/bss crossover
  page in a program (typically just declare a global variable in a small program
  and mlock() its page, then exit without munlock()ing).  4K is lost each time
  the program is run.
  Revision  Changes    Path
  1.41      +6 -9      src/sys/i386/i386/pmap.c


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