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MIPS atomic operations, "sync"]

Fwd: Sergei Shtylyov 1 participant 1 message Nov 10, 2006 MIPS

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-------- Original Message --------
Subject: [Ltt-dev] MIPS atomic operations, "sync"
Date: Fri, 10 Nov 2006 13:36:53 -0500
From: Mathieu Desnoyers <[email protected]>
To: [email protected], [email protected]

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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