From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Cc: compudj@krystal.dyndns.org, tt-dev@shafik.org
Subject: [Fwd: [Ltt-dev] MIPS atomic operations, "sync"]
Date: Fri, 10 Nov 2006 21:39:44 +0300 [thread overview]
Message-ID: <4554C770.10106@ru.mvista.com> (raw)
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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 <compudj@krystal.dyndns.org>
To: lkml@vger.kernel.org, ltt-dev@shafik.org
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
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next reply other threads:[~2006-11-10 18:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-10 18:39 Sergei Shtylyov [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-11-10 21:51 [Fwd: [Ltt-dev] MIPS atomic operations, "sync"] Kaz Kylheku
2006-11-10 21:51 ` Kaz Kylheku
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