K 10
svn:author
V 4
jeff
K 8
svn:date
V 27
2003-09-30T08:11:36.000000Z
K 7
svn:log
V 542
 - On my Pentium4-M laptop, invalpg takes ~1100 cycles if the page is found in
   the TLB and ~1600 if it is not.  Therefore, it is more effecient to
   invalidate the TLB after operations that use CMAP rather than before.
 - So that the tlb is invalidated prior to switching off of a processor, we
   must change the switchin functions to switchout functions.
 - Remove td_switchout from the thread and move it to the x86 pcb.
 - Move the code that calls switchout into swtch.s.  These changes make this
   optimization truely x86 specific.

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