Re: [RFC PATCH 3/6] perf: Generalize some arch callchain code

[Frederic Weisbecker]

On Thu, Jul 01, 2010 at 05:46:01PM +0200, Peter Zijlstra wrote:
> On Thu, 2010-07-01 at 17:35 +0200, Frederic Weisbecker wrote:
> > - Most archs use one callchain buffer per cpu, except x86 that needs
> >   to deal with NMIs. Provide a default perf_callchain_buffer()
> >   implementation that x86 overrides. 
> 
> sparc and power also have NMI like contexts.


Ah and the comments suggest it's because pmu interrupts can't nest or so.
Anyway, that's notwithstanding the race that 5th patch fixes.

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