On Wed, Sep 09, 2009 at 03:37:07PM +0000, tip-bot for Mike Galbraith wrote: > Commit-ID: 2bba22c50b06abe9fd0d23933b1e64d35b419262 > Gitweb: http://git.kernel.org/tip/2bba22c50b06abe9fd0d23933b1e64d35b419262 > Author: Mike Galbraith <efault@xxxxxx> > AuthorDate: Wed, 9 Sep 2009 15:41:37 +0200 > Committer: Ingo Molnar <mingo@xxxxxxx> > CommitDate: Wed, 9 Sep 2009 17:30:05 +0200 > > sched: Turn off child_runs_first > > Set child_runs_first default to off. > > It hurts 'optimal' make -j<NR_CPUS> workloads as make jobs > get preempted by child tasks, reducing parallelism. Wasn't one of the reasons why we historically did child_runs_first was so that for fork/exit workloads, the child has a chance to exec the new process? If the parent runs first, then more pages will probably need to be COW'ed. - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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