From: Peter Zijlstra <peterz@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
benh <benh@kernel.crashing.org>, davem <davem@davemloft.net>,
"H. Peter Anvin" <hpa@zytor.com>,
Linux-Arch <linux-arch@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>, dhowells <dhowells@redhat.com>
Subject: Re: on memory barriers and cachelines
Date: Wed, 01 Feb 2012 18:29:16 +0100 [thread overview]
Message-ID: <1328117356.2446.260.camel@twins> (raw)
In-Reply-To: <CA+55aFx2pZtabFS54xfiLRcWnXi2NJjCHxdn-NLzFOqg7HNtmg@mail.gmail.com>
On Wed, 2012-02-01 at 09:17 -0800, Linus Torvalds wrote:
>
> Also, even if you were to find an atomic sub-chunk, if you need a
> "smp_rmb()", what else would guarantee that the CPU core wouldn't
> re-order things to do the second read first, then lose the cacheline,
> re-read it, and then do the first read?
Fair enough.. Thanks!
prev parent reply other threads:[~2012-02-01 17:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-01 9:33 on memory barriers and cachelines Peter Zijlstra
2012-02-01 14:22 ` Paul E. McKenney
2012-02-10 2:51 ` Jamie Lokier
2012-02-10 16:32 ` Paul E. McKenney
2012-02-10 18:13 ` Peter Zijlstra
2012-02-10 18:47 ` Paul E. McKenney
2012-02-01 17:17 ` Linus Torvalds
2012-02-01 17:29 ` Peter Zijlstra [this message]
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