[GHC] #15414: Why both gen and gen_no in bdescr?

[GHC]

#15414: Why both gen and gen_no in bdescr?
-------------------------------------+-------------------------------------
        Reporter:  bgamari           |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Runtime System    |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by bgamari):

 In principle you could also drop `start` since it is somewhat easily
 computed from the bdescr address. This would all serve to trade-off some
 amount of false-sharing for improved cache utilization.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15414#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler