On Mon, 29 Jan 2007, Peter Zijlstra wrote:

Ladder locking would end up:

lock A0
lock B1
unlock A0 -> a new operation can start
lock C2
unlock B1
lock D5
unlock C2
** we do stuff to D5
unlock D5

Instead of taking one lock we would need to take 4? Wont doing so cause 
significant locking overhead? We probably would want to run some 
benchmarks. Maybe disable the scheme for systems with a small number of 
processors?


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