Messages in this thread | | | Subject | Re: [PATCH] SLUB use cmpxchg_local | From | Peter Zijlstra <> | Date | Tue, 28 Aug 2007 09:12:39 +0200 |
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On Mon, 2007-08-27 at 15:15 -0700, Christoph Lameter wrote: > Hmmmm. One wild idea would be to use a priority futex for the slab lock? > That would make the slow paths interrupt safe without requiring interrupt > disable? Does a futex fit into the page struct?
Very much puzzled at what you propose. in-kernel we use rt_mutex (has PI) or mutex, futexes are user-space. (on -rt spinlock_t == mutex == rt_mutex)
Neither disable interrupts since they are sleeping locks.
That said, on -rt we do not need to disable interrupts in the allocators because its a bug to call an allocator from raw irq context.
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