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From: Paolo Bonzini <pbonzini@redhat.com>
To: "Emilio G. Cota" <cota@braap.org>, Richard Henderson <rth@twiddle.net>
Cc: "MTTCG Devel" <mttcg@greensocs.com>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"QEMU Developers" <qemu-devel@nongnu.org>,
	"Sergey Fedorov" <serge.fdrv@gmail.com>
Subject: Re: [Qemu-devel] [PATCH 1/2] atomics: do not use __atomic primitives for RCU atomics
Date: Tue, 24 May 2016 09:08:01 +0200	[thread overview]
Message-ID: <ecc59b16-8496-db4d-3df8-cfe1e6b0357a@redhat.com> (raw)
In-Reply-To: <20160523170912.GA16390@flamenco>



On 23/05/2016 19:09, Emilio G. Cota wrote:
> 		E.
> 
> PS. And really equating smp_wmb/rmb to release/acquire as we have under
> #ifdef __ATOMIC is hard to justify, other than to please tsan.

That only makes a difference on arm64, right?

	acquire		release		rmb		wmb
x86	--		--		--		--
power	lwsync		lwsync		lwsync		lwsync
armv7	dmb		dmb		dmb		dmb
arm64	dmb ishld	dmb ish		dmb ishld	dmb ishst
ia64	--		--		--		--

Thanks,

Paolo

  reply	other threads:[~2016-05-24  7:08 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-21 20:42 [Qemu-devel] [PATCH 0/2] atomics: fix small RCU perf. regression + update documentation Emilio G. Cota
2016-05-21 20:42 ` [Qemu-devel] [PATCH 1/2] atomics: do not use __atomic primitives for RCU atomics Emilio G. Cota
2016-05-22  7:58   ` Alex Bennée
2016-05-24 18:42     ` Emilio G. Cota
2016-05-23 14:21   ` Paolo Bonzini
2016-05-23 15:55     ` Emilio G. Cota
2016-05-23 16:53   ` Richard Henderson
2016-05-23 17:09     ` Emilio G. Cota
2016-05-24  7:08       ` Paolo Bonzini [this message]
2016-05-24 19:56         ` Emilio G. Cota
2016-05-24 19:59           ` Sergey Fedorov
2016-05-25  8:52             ` Alex Bennée
2016-05-25 11:02               ` Sergey Fedorov
2016-05-21 20:42 ` [Qemu-devel] [PATCH 2/2] docs/atomics: update atomic_read/set comparison with Linux Emilio G. Cota

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