Re: [patch 05/24] perfmon: X86 generic code (x86)

[David Miller]

From: "stephane eranian" <eranian@xxxxxxxxxxxxxx>
Date: Thu, 27 Nov 2008 12:35:54 +0100

> I am still wondering how Oprofile handles the case where multiple
> processes or threads access the same file descriptor.

There's only one profiling buffer active on a given cpu,
so it's pure per-cpu value insertion.

In any event I think that NMI profiling is a must, especially
for the kernel.  You get total unusable crap otherwise.  I
just learned this the hard way having gotten an NMI'ish scheme
working on sparc64 just the other day.
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