On Thu, 2008-07-24 at 02:32 -0700, David Miller wrote:

From: Peter Zijlstra <redacted>
Date: Thu, 24 Jul 2008 11:27:05 +0200

quoted

Well, not only lockdep, taking a very large number of locks is expensive
as well.

Right now it would be on the order of 16 or 32 for
real hardware.

Much less than the scheduler currently takes on some
of my systems, so currently you are the pot calling the
kettle black. :-)

One nit, and then I'll let this issue rest :-)

The scheduler has a long lock dependancy chain (nr_cpu_ids rq locks),
but it never takes all of them at the same time. Any one code path will
at most hold two rq locks.



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