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From: Robert Watson <rwatson@FreeBSD.org>
Date: Fri, 23 Jul 2004 14:11:04 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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Subject: cvs commit: src/sys/kern sys_pipe.c
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rwatson     2004-07-23 14:11:04 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             sys_pipe.c 
  Log:
  Don't perform pipe endpoint locking during pipe_create(), as the pipe
  can't yet be referenced by other threads.
  
  In microbenchmarks, this appears to reduce the cost of
  pipe();close();close() on UP by 10%, and SMP by 7%.  The vast majority
  of the cost of allocating a pipe remains VM magic.
  
  Suggested by:   silby
  
  Revision  Changes    Path
  1.173     +20 -11    src/sys/kern/sys_pipe.c