| From | Andi Kleen <> | Subject | Re: [rfc 00/45] [RFC] CPU ops and a rework of per cpu data handling on x86_64 | Date | Tue, 20 Nov 2007 04:25:34 +0100 |
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> Although we have a per-cpu area base in a fixed global register > for addressing, the above isn't beneficial on sparc64 because > the atomic is much slower than doing a: > > local_irq_disable(); > nonatomic_percpu_memory_op(); > local_irq_enable();
Again might be pointing out the obvious, but you need of course save_flags()/restore_flags(), not disable/enable().
If it was just disable/enable x86 could do it much faster too and Christoph probably would never felt the need to approach this project for his SLUB fast path.
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