RE: [PATCH] lock stat for -rt 2.6.20-rc2-rt2.2.lock_stat.patch

[Chen, Tim C]

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.

Tim
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