Messages in this thread | | | Date | Thu, 1 Jul 2010 17:53:33 +0200 | From | Frederic Weisbecker <> | Subject | Re: [RFC PATCH 3/6] perf: Generalize some arch callchain code |
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On Thu, Jul 01, 2010 at 05:51:22PM +0200, Peter Zijlstra wrote: > On Thu, 2010-07-01 at 17:49 +0200, Frederic Weisbecker wrote: > > 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. > > Right, but they could interrupt a software event or the like.
Yeah indeed.
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