Don't apply for write lock on tasklist_lock if parent doesn't ptrace other processes
in [Kernel]
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From: Kleen, Andi on 26 Jul 2010 05:50 > The only difference is that we are doing the function call + > list_empty() > under tasklist, just a few instructions compared to "do a lot more > work" > in forget_original_parent(). > > How this can make the 2% difference ? This looks like a noise to me, > or do you think I missed something? It could be a cache miss or something like that. Instructions are not all the same cost. Only detailed profiling with different performance counters could give you more information. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |