Messages in this thread | | | Subject | RE: [PATCH] lock stat for -rt 2.6.20-rc2-rt2.2.lock_stat.patch | Date | Wed, 3 Jan 2007 16:25:46 -0800 | From | "Chen, Tim C" <> |
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Bill Huey (hui) wrote: > > Good to know that. What did the output reveal ? > > What's your intended use again summarized ? futex contention ? I'll > read the first posting again. >
Earlier I used latency_trace and figured that there was read contention on mm->mmap_sem during call to _rt_down_read by java threads when I was running volanomark. That caused the slowdown of the rt kernel compared to non-rt kernel. The output from lock_stat confirm that mm->map_sem was indeed the most heavily contended lock.
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