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From: Sergey Kandaurov <pluknet@FreeBSD.org>
Date: Thu, 24 Feb 2011 09:22:56 +0000 (UTC)
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Subject: cvs commit: src/lib/libc/sys mmap.2 src/sys/vm vm_mmap.c
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pluknet     2011-02-24 09:22:56 UTC

  FreeBSD src repository

  Modified files:
    lib/libc/sys         mmap.2 
    sys/vm               vm_mmap.c 
  Log:
  SVN rev 218989 on 2011-02-24 09:22:56Z by pluknet
  
  Remove sysctl vm.max_proc_mmap used to protect from KVA space exhaustion.
  As it was pointed out by Alan Cox, that no longer serves its purpose with
  the modern UMA allocator compared to the old one used in 4.x days.
  
  The removal of sysctl eliminates max_proc_mmap type overflow leading to
  the broken mmap(2) seen with large amount of physical memory on arches
  with factually unbound KVA space (such as amd64).  It was found that
  slightly less than 256GB of physmem was enough to trigger the overflow.
  
  Reviewed by:    alc, kib
  Approved by:    avg (mentor)
  MFC after:      2 months
  
  Revision  Changes    Path
  1.63      +0 -3      src/lib/libc/sys/mmap.2
  1.251     +0 -39     src/sys/vm/vm_mmap.c