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Re: kernel profiling artifact: Xspllower the leaf function
On Fri, Jul 12, 2013 at 7:09 AM, David Young <dyoung%pobox.com@localhost> wrote:
> I am profiling a 6-ish kernel with kgmon/gprof. I find that Xspllower
> is quite prominent in my profiles *and* that it looks like a
> "leaf"---that is, like it doesn't call anything.
> I suspect that the reason for Xspllower's prominence and "leafiness"
> is that it enters handlers for deferred interrupts in some "funny"
> way that does not create the type of stack frame that the profiler
> recognizes. So gprof ascribes to Xspllower time that is in fact spent
> running handlers for the deferred interrupts. Could that be?
> More to the point, is there an easy way to produce a more reliable profile?
I plan to improve tprof(8) support. AFAIU it supports only NetBurst now.
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