Messages in this thread |  | | | Date | Wed, 8 Jun 2011 12:58:16 -0700 | | From | "Paul E. McKenney" <> | | Subject | Re: [PATCH 2/4] sched: Isolate preempt counting in its own config option |
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On Wed, Jun 08, 2011 at 09:47:14PM +0200, Peter Zijlstra wrote: > On Wed, 2011-06-08 at 19:48 +0200, Frederic Weisbecker wrote: > > > > Create a new CONFIG_PREEMPT_COUNT that handles the inc/dec > > of preempt count offset independently. So that the offset > > can be updated by preempt_disable() and preempt_enable() > > even without the need for CONFIG_PREEMPT beeing set. > > > > This prepares to make CONFIG_DEBUG_SPINLOCK_SLEEP working > > with !CONFIG_PREEMPT where it currently doesn't detect > > code that sleeps inside explicit preemption disabled > > sections. > > The last time this got proposed it got shot down due to the extra > inc/dec stuff all over the place increasing overhead significantly.
Even given that the extra inc/dec stuff only happens in kernels built with DEBUG_SPINLOCK_SLEEP=y (DEBUG_ATOMIC_SLEEP=y after patch 4/4)?
Thanx, Paul
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