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    SubjectRe: [PATCH RFC tip/core/rcu 11/11] rcu: move TREE_RCU from softirq to kthread
    On Wed, 23 Feb 2011, Paul E. McKenney wrote:

    > These do introduce redundant preempt_disable()/preempt_enable() calls, but
    > this is not on a fastpath, so should be OK, and the improved readability
    > is certainly nice. The read and the write do need to happen on the same
    > CPU, FWIW.

    this_cpu_xxx only use preempt_enable/disable() on platforms that do not
    support per cpu atomic instructions. On x86 no preempt enable/disable will
    be inserted.

    You can also use the __this_cpu_xxx operations which never add preempt
    disable/enable because they expect the caller to deal with preemption.

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      Last update: 2011-02-23 20:25    [W:0.026 / U:2.808 seconds]
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