- To: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
- Subject: Re: [PATCH 11/39] autonuma: CPU follow memory algorithm
- From: Ingo Molnar <mingo@xxxxxxxxxx>
- Date: Tue, 27 Mar 2012 19:09:30 +0200
- Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Hillf Danton <dhillf@xxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Dan Smith <danms@xxxxxxxxxx>, Paul Turner <pjt@xxxxxxxxxx>, Lai Jiangshan <laijs@xxxxxxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Lee Schermerhorn <Lee.Schermerhorn@xxxxxx>, linux-mm@xxxxxxxxx, Suresh Siddha <suresh.b.siddha@xxxxxxxxx>, Mike Galbraith <efault@xxxxxx>, Bharata B Rao <bharata.rao@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Johannes Weiner <hannes@xxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
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* Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:
> You can talk pretty much anything down to O(1) that way. Take
> an algorithm that is O(n) in the number of tasks, since you
> know you have a pid-space constraint of 30bits you can never
> have more than 2^30 (aka 1Gi) tasks, hence your algorithm is
> O(2^30) aka O(1).
We can go even further than that, IIRC all physical states of
this universe fit into a roughly 2^1000 finite state-space, so
every computing problem in this universe is O(2^1000), i.e.
every computing problem we can ever work on is O(1).
Really, I think Andrea is missing the big picture here.
Thanks,
Ingo
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