Forwarding to the correct mail list... -------- Original Message -------- Subject: [Ltt-dev] MIPS atomic operations, "sync" Date: Fri, 10 Nov 2006 13:36:53 -0500 From: Mathieu Desnoyers <compudj@xxxxxxxxxxxxxxxxxx> To: lkml@xxxxxxxxxxxxxxx, ltt-dev@xxxxxxxxxx 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 OpenPGP public key: http://krystal.dyndns.org:8080/key/compudj.gpg Key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 _______________________________________________ Ltt-dev mailing list Ltt-dev@xxxxxxxxxxxxxxxxxxx http://listserv.shafik.org/mailman/listinfo/ltt-dev
