Messages in this thread | | | Date | Tue, 14 Aug 2007 14:15:12 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c |
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On Tue, 14 Aug 2007, Andi Kleen wrote:
> > Hmmmm... The spinlock is its own flag. > > Yes, but it's not CPU local. Taking the spinlock from another CPU's > interrupt handler is perfectly safe, just not from the local CPU. > If you use the spinlock as flag you would need to lock out everybody.
So every spinlock would have an array of chars sized to NR_CPUS and set the flag when the lock is taken?
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