Messages in this thread | | | Date | Mon, 27 Nov 2006 16:56:43 +0000 | From | Christoph Hellwig <> | Subject | Re: [PATCH 4/16] LTTng 0.6.36 for 2.6.18 : atomic UP operations on SMP |
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On Fri, Nov 24, 2006 at 04:55:18PM -0500, Mathieu Desnoyers wrote: > This patch adds a UP flavor of SMP operations which is intended to provide > atomic modification of per-cpu data without suffering from the LOCK of memory > barrier performance cost. Note that extreme care must be taken when accessing > this data from different CPUs : smp_wmb() and smp_rmb() must be used > explicitely. As this last scenario happens very rarely in LTTng, it provides a
We already have local_t in asm/local.h for this purposed. Unfortunately several architecture implementations are rather suboptimal, but I'm sure the architecture maintainers would be interested in patches to optimize the various implementations.
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