Re: [patch] lockless, scalable get_pid(), for_each_process() elimination, 2.5.35-BK

From: William Lee Irwin III (
Date: Tue Sep 17 2002 - 21:22:42 EST

From: William Lee Irwin III <>
> The issues addressed here are extremely important for the workloads I
> must support.

On Tue, Sep 17, 2002 at 06:27:22PM -0700, David S. Miller wrote:
> Have you published test tools that emulate your workload?
> These would be very useful, probably to find problems even
> outside the scope of pid lookups.

By and large I've been using existing tools, for instance, multiple
tiobench instances to obtain a large task count. The test cases I've
had to construct by hand are generally meant to trigger pagetable OOM,
which I've been assigned to do something about. In general, I attempt
to simulate the VM and I/O characteristics of databases. Sometimes I
have to get a bit inventive, e.g. recent 2*dbench 512 on tmpfs test.

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