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    SubjectRe: aio stress panic on 2.6.11-mm1
    On Wed, 2005-03-09 at 16:34 +0530, Suparna Bhattacharya wrote:
    > Any sense of how costly it is to use spin_lock_irq's vs spin_lock
    > (across different architectures)

    on x86 it makes a difference of maybe a few cycles. At most.
    However please consider using spin_lock_irqsave(); the _irq() variant,
    while it can be used correctly, is a major source of bugs since it
    unconditionally enables interrupts on unlock.

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