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From: John Baldwin <jhb@FreeBSD.org>
Date: Mon, 18 Apr 2011 18:55:27 +0000 (UTC)
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X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sys/amd64/amd64 exception.S
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jhb         2011-04-18 18:55:27 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/amd64/amd64      exception.S 
  Log:
  SVN rev 220797 on 2011-04-18 18:55:27Z by jhb
  
  MFC 220430,220431,220452,220460:
  If a system call does not request a full interrupt return, use a fast
  path via the sysretq instruction to return from the system call.  This
  resolves most of the performance regression in system call microbenchmarks
  between 7 and 8 on amd64.
  
  While here, trim an instruction (and memory access) from the doreti path
  and fix a typo in a comment.
  
  Revision    Changes    Path
  1.140.2.12  +37 -4     src/sys/amd64/amd64/exception.S