Messages in this thread | | | Date | Thu, 27 Nov 2008 03:42:47 -0800 (PST) | Subject | Re: [patch 05/24] perfmon: X86 generic code (x86) | From | David Miller <> |
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From: "stephane eranian" <eranian@googlemail.com> 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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