Messages in this thread | | | From | "Kleen, Andi" <> | Date | Mon, 26 Jul 2010 10:40:28 +0100 | Subject | RE: [PATCH] Don't apply for write lock on tasklist_lock if parent doesn't ptrace other processes |
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> 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
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