cvs commit: src/sys/kern sys_pipe.c

[Robert Watson]

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