Re: [patch] latency tracer, 2.6.15-rc7

[Lee Revell <rlrevell@joe-job.com>]

On Fri, 2005-12-30 at 20:29 -0800, Paul E. McKenney wrote:
> This should help in UP configurations, or in SMP configurations where
> all CPUs are doing call_rcu_bh() very frequently.  I would not expect
> it to help in cases where one of several CPUs is frequently executing
> call_rcu_bh(), but where the other CPUs are either CPU-bound in user
> space or are in a tickful idle state. 

This and net/decnet/dn_route.c are the only two uses of call_rcu_bh in
the kernel.  And this one does not seem to be invoked frequently, it
took ~48 hours to show up in the latency tracer.  Of course a server
workload might call it all the time.

Lee

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