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    SubjectRe: [PATCH -v5][RFC]: mutex: implement adaptive spinning

    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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