Messages in this thread | | | Date | Wed, 7 Jan 2009 18:49:45 -0500 (EST) | From | Steven Rostedt <> | Subject | Re: [PATCH -v5][RFC]: mutex: implement adaptive spinning |
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On Wed, 7 Jan 2009, Linus Torvalds wrote: > On Wed, 7 Jan 2009, Dave Kleikamp wrote: > > > > Do you need to even do that if CONFIG_DEBUG_PAGEALLOC is unset? > > No. > > > Something like: > > > > #ifdef CONFIG_DEBUG_PAGEALLOC > > /* > > * Need to access the cpu field knowing that > > * DEBUG_PAGEALLOC could have unmapped it if > > * the mutex owner just released it and exited. > > */ > > if (probe_kernel_address(&thread->cpu, cpu)) > > break; > > #else > > cpu = thread->cpu; > > #endif > > yes. That would work fine.
What about memory hotplug as Ingo mentioned?
Should that be:
#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_MEMORY_HOTPLUG)
??
-- Steve
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