Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH 10/18] 2.6.17.9 perfmon2 patch for review: PMU context switch support | Date | Fri, 25 Aug 2006 15:17:30 +0200 |
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On Friday 25 August 2006 14:56, Stephane Eranian wrote: > On Fri, Aug 25, 2006 at 02:20:31PM +0200, Andi Kleen wrote: > > On Friday 25 August 2006 13:56, Stephane Eranian wrote: > > > > > > I suppose some of those functions must be marked __kprobes > > > > > > > Are there any guidelines as to why some functions must be ignored > > > by kprobes? I assume if meaans they cannot be instrumented. > > > > It does yes. > > > > In general anything that could cause kprobes to recurse is forbidden. > > In the case of the PMU context switch, are you saying that you may > context switch as a consequence of hitting a (K)probe?
I hope not, but at least the current __switch_to is marked __kprobes and I assume there was some reason for it and it will likely apply to callees too. For details ask Prasanna (cc'ed).
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