Re: [PATCH 1/2] nohz: Select VIRT_CPU_ACCOUNTING_GEN from fulldynticks config
From: Ingo Molnar
Date: Sat Apr 27 2013 - 03:19:32 EST
* Frederic Weisbecker <fweisbec@xxxxxxxxx> wrote:
> 2013/4/26 Frederic Weisbecker <fweisbec@xxxxxxxxx>:
> > On Fri, Apr 26, 2013 at 08:39:56AM -0700, Paul E. McKenney wrote:
> >> > config VIRT_CPU_ACCOUNTING_GEN
> >> > bool "Full dynticks CPU time accounting"
> >> > - depends on HAVE_CONTEXT_TRACKING && 64BIT
> >> > + depends on HAVE_CONTEXT_TRACKING && 64BIT && NO_HZ_FULL
> >> Do you really want this change? This prohibits VIRT_CPU_ACCOUNTING_GEN
> >> unless NO_HZ_FULL, which means that it can no longer be used in situations
> >> where it used to be usable. My guess is that you want to leave this
> >> particular line as it was.
> > Hmm, this can make sense. This can be used to perform comparisons between
> > tick-based and tickless cputime accounting easily.
> > I'll respin.
> So Ingo please pull "timers/nohz-v2" instead. It does the same but
> keeps VIRT_CPU_ACCOUNTING_GEN available even without full dynticks
> (could be useful when users need something more precise than tick
> based cputime accounting.)
> HEAD is 8c23b80ec7f1f5405f07bb56c2f8378800ecf401
> If you've already pulled the previous branch I'll make a delta instead.
Pulled, thanks Frederic!
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