Messages in this thread | | | Date | Fri, 10 Nov 2006 13:40:49 -0500 | From | Mathieu Desnoyers <> | Subject | MIPS atomic operations, "sync" |
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Hi,
I am currently creating a "LOCK" prefix free and memory barrier free version of atomic.h to fulfill my tracer (LTTng) needs, which is to atomically update per-cpu data and have a minimal performance loss.
I just came across the MIPS atomic.h and system.h implementations in 2.6.18 which brings a question :
Why are the primitives in include/asm-mips/atomic.h using the "sync" instruction even in the UP case ? system.h cmpxchg only uses the sync in the SMP case.
Mathieu
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