lkml.org 
[lkml]   [2006]   [Jul]   [26]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
    /
    DateWed, 26 Jul 2006 15:14:02 +1000
    FromPeter Williams <>
    SubjectRe: [ANNOUNCE][RFC] PlugSched-6.4 for 2.6.18-rc2
    Al Boldi wrote:
    > Peter Williams wrote:
    >> Al Boldi wrote:
    >>> Peter Williams wrote:
    >>>> Al Boldi wrote:
    >>>>> Peter Williams wrote:
    >>>>>> Al Boldi wrote:
    >> [bits deleted]
    >>
    >>>>>>> It may be really great, to allow schedulers perPid parent, thus
    >>>>>>> allowing the stacking of different scheduler semantics.  This could
    >>>>>>> aid flexibility a lot.
    >>>>>> I'm don't understand what you mean here.  Could you elaborate?
    >>>>> i.e:  Boot the kernel with spa_no_frills, then start X with spa_ws.
    >>>> It's probably not a good idea to have different schedulers managing the
    >>>> same resource.  The way to do different scheduling per process is to
    >>>> use the scheduling policy mechanism i.e. SCHED_FIFO, SCHED_RR, etc.
    >>>> (possibly extended) within each scheduler.  On the other hand, on an
    >>>> SMP system, having a different scheduler on each run queue (or sub set
    >>>> of queues) might be interesting :-).
    >>> What's wrong with multiple run-queues on UP?
    >> A really high likelihood of starvation of some tasks.
    > 
    > Maybe you are thinking of running independent run-queues, in which case it 
    > would probably be unwise to run multiple RQs on a single CPU.
    
    No.  I'm thinking about different schedulers on a single run queue.  I 
    don't think that it's a good idea.
    
    > 
    > But I was more thinking of a run-queue of run-queues, with the masterRQ 
    > scheduling slaveRQs, each RQ possible running its own scheduling semantic.
    
    I think that you need to think a bit harder about the consequences of 
    such a system.  The word "chaos" springs to mind.
    
    Peter
    -- 
    Peter Williams                                   pwil3058@bigpond.net.au
    
    "Learning, n. The kind of ignorance distinguishing the studious."
      -- Ambrose Bierce
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at  http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at  http://www.tux.org/lkml/
    
    
    \
     
     \ /
      Last update: 2006-07-26 07:17    [from the cache]
    ©2003-2008