Re: [PATCH] cpuset and sched domains: sched_load_balance flag

[Paul Jackson]

Nick wrote:
> So if a new pdflush is spawned, it get's moved to some cpuset? That
> probably isn't something these realtime systems want to do (ie. the
> non-realtime portion probably doesn't want to have any sort of scheduler
> or even worry about cpusets at all).

No - the new pdflush is put in the same cpuset as its parent, with a
patch that I sent in early this year.  See the following code in
mm/pdflush.c:

        /*
         * Some configs put our parent kthread in a limited cpuset,
         * which kthread() overrides, forcing cpus_allowed == CPU_MASK_ALL.
         * Our needs are more modest - cut back to our cpusets cpus_allowed.
         * This is needed as pdflush's are dynamically created and destroyed.
         * The boottime pdflush's are easily placed w/o these 2 lines.
         */
        cpus_allowed = cpuset_cpus_allowed(current);
        set_cpus_allowed(current, cpus_allowed);

        return __pdflush(&my_work);

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@xxxxxxx> 1.925.600.0401
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