[REGRESSION 2.6.30][PATCH 1/1] sched: defer idle accounting till after load update period

Chase Douglas chase.douglas at canonical.com
Thu Apr 1 20:32:15 UTC 2010

On Thu, Apr 1, 2010 at 4:18 PM, Thomas Gleixner <tglx at linutronix.de> wrote:
> Also we need to think about a more clever way than just accounting the
> number of running and uninterruptible tasks. What we really want is to
> use the numbers which the scheduler has handy, i.e how many tasks did
> we run since we did the last loadavg calculation. It was always
> possible (even before the big loadavg changes) to create a task which
> consumes 50% of a CPU and never shows up in the loadavg calculations
> at all.

I'm not sure I follow how knowing how many tasks have been run since
the last LOAD_FREQ expiration will help, or is that just an example of
the kind of data the scheduler has available that may be useful?

-- Chase

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