Arjan van de Ven <[EMAIL PROTECTED]> writes: > 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.
irqsave is much worse than _irq on P4. However the spinlock already synchronizes the CPU, so some of the cost should be mitigated. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
