Re: [PATCH 3/3] KVM: MMU: Separate trivial NULL check out from rmap_get_next()

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On 03/15/2012 03:41 PM, Takuya Yoshikawa wrote:
> > What I mean is, modern cpus effectively inline simple function calls by
> > predicting the call, and branchs within the function, and the return, so
> > they don't have to stop their pipelines at any of these points.  But
> > again, the numbers talk louder than speculation about cpu architecture.
>
> I need to update my knowledge, thank you!
>
>

You can look at what's happening by doing

  perf record -a -f
  perf report

using the TUI, select 'annotate rmap_get_next'

You should see where the time is spent.

-- 
error compiling committee.c: too many arguments to function

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