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

[Thomas Gleixner <tglx@linutronix.de>]

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