Messages in this thread | | | Subject | Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation | From | Alan Cox <> | Date | Tue, 13 Dec 2005 13:09:31 +0000 |
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On Maw, 2005-12-13 at 13:47 +0100, Oliver Neukum wrote: > > spinlock to do the cmpxchg. This means that there wont be one single > > global spinlock to emulate cmpxchg, but the mutex's own spinlock can be > > used for it. > > Can't you use the pointer as a hash input?
Some platforms already do this for certain sets of operations like atomic_t. The downside however is that you no longer control the lock contention or cache line bouncing. It becomes a question of luck rather than science as to how well it scales.
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