2.3.51: this doesn't look right

From: Dimitris Michailidis (dimitris@cthulhu.engr.sgi.com)
Date: Sat Mar 11 2000 - 21:22:58 EST

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    The following was added to exit.c in 2.3.51:

    + /*
    + * Potentially available timeslices are retrieved
    + * here - this way the parent does not get penalized
    + * for creating too many processes.
    + *
    + * (this cannot be used to artificially 'generate'
    + * timeslices, because any timeslice recovered here
    + * was given away by the parent in the first place.)
    + */
    + current->counter += p->counter;
    + if (current->counter > current->priority)
    + current->counter = current->priority;

    Because of counter recalculation current->counter may be > current->priority
    before the above is executed. In this case not only does the parent not get
    any of the child's ticks, it loses some of its own. This tick reclamation
    looks questionable if the parent's counter has been renewed since the fork().
    In that case, contrary to the comment, the above can be used to artificially
    'generate' timeslices. 

    -- 
Dimitris Michailidis                    dimitris@engr.sgi.com

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