Messages in this thread | | | Date | Thu, 27 Nov 2008 12:49:37 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: [patch 05/24] perfmon: X86 generic code (x86) |
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On Thu, 27 Nov 2008, David Miller wrote:
> 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.
Not arguing about that, I'm just not agreeing with the implementation.
So for the moment we can go w/o the NMI and implement it cleanly after we got the initial lot in.
Thanks,
tglx
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