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From: Mark Murray <markm@FreeBSD.org>
Date: Sun, 25 Jun 2000 01:32:39 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/dev/nulldev nulldev.c
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markm       2000/06/25 01:32:39 PDT

  Added files:
    sys/dev/nulldev      nulldev.c 
  Log:
  New machine independant /dev/null and /dev/zero driver. This device is
  severely stripped down compared with its predecessor, and is measurably
  a _lot_ faster.
  
  Many thanks to Jeroen van Gelderen for lots of good ideas.
  
  There is still a problem with this; it is written as a mudule, and as
  such is theoretically unloadable. However, there is no refcounting done
  as I would prefer to do that a'la device_busy(9), rather than some
  "home-rolled" scheme. The point is pretty moot, as /dev/null is
  effectively compulsory.
  
  Reviewed by:	dfr



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