Re: [PATCH] - Reduce overhead of calc_load

Nick Piggin wrote:

Andrew Morton wrote:

Take a look at (for example) nr_iowait.  We forget to spill the count out
of the departing CPU's runqueue and hence we have to sum it across all

I don't think a departing runqueue should have any iowaiters on it, should it?

No I'm wrong there. Instead of doing all these migrations and having the
ugly nr_iowait and nr_uninterruptible things I would much prefer just to
migrate the stat when the actual task is migrated. This should take care
of cpu hotplug, and also can make everything consistent.

I'll try doing a patch for that sometime.

--
SUSE Labs, Novell Inc.

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• References:
  • [PATCH] - Reduce overhead of calc_load
    • From: Jack Steiner <[email protected]>
  • Re: [PATCH] - Reduce overhead of calc_load
    • From: Ingo Molnar <[email protected]>
  • Re: [PATCH] - Reduce overhead of calc_load
    • From: Jack Steiner <[email protected]>
  • Re: [PATCH] - Reduce overhead of calc_load
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH] - Reduce overhead of calc_load
    • From: Nick Piggin <[email protected]>
  • Re: [PATCH] - Reduce overhead of calc_load
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH] - Reduce overhead of calc_load
    • From: Nick Piggin <[email protected]>
  • Re: [PATCH] - Reduce overhead of calc_load
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH] - Reduce overhead of calc_load
    • From: Nick Piggin <[email protected]>

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