Messages in this thread | | | Subject | Re: [RFC PATCH v3 5/5] sched: activate active load balancing in new idle cpus | From | Peter Zijlstra <> | Date | Tue, 11 Nov 2008 14:47:15 +0100 |
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On Tue, 2008-11-11 at 00:03 +0530, Vaidyanathan Srinivasan wrote: > Active load balancing is a process by which migration thread > is woken up on the target CPU in order to pull current > running task on another package into this newly idle > package. > > This method is already in use with normal load_balance(), > this patch introduces this method to new idle cpus when > sched_mc is set to POWERSAVINGS_BALANCE_WAKEUP. > > This logic provides effective consolidation of short running > daemon jobs in a almost idle system > > The side effect of this patch may be ping-ponging of tasks > if the system is moderately utilised. May need to adjust the > iterations before triggering.
OK, I'm so not getting this patch..
if normal newly idle balancing fails that means the other runqueue has only a single task on it (or some other really stubborn stuff), so then you go move that one task that is already running, from one cpu to another.
_why_?
The only answer I can come up with is that you prefer one cpu's idle-ness over another - which makes sense, as you try to get whole packages idle.
But I'm not seeing where that package logic is hidden..
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