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From: "H. Peter Anvin" <h.peter.anvin@intel.com>
To: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH v2 0/2] add support for new persistent memory instructions
Date: Mon, 26 Jan 2015 12:05:13 -0800	[thread overview]
Message-ID: <54C69DF9.1090702@intel.com> (raw)
In-Reply-To: <1422301899.13382.2.camel@theros.lm.intel.com>

On 01/26/2015 11:51 AM, Ross Zwisler wrote:
> 
> This is fine, but now you've got two fences in a row.  Another slightly more
> messy choice would be to include the fence in the pcommit assembly, so
> you either get pcommit + sfence or a pair of NOPs.
> 

If that is the required usage pattern, it should be part of the clwb()
inline at least.

	-hpa


      reply	other threads:[~2015-01-26 20:05 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-23 20:40 [PATCH v2 0/2] add support for new persistent memory instructions Ross Zwisler
2015-01-23 20:40 ` [PATCH v2 1/2] x86: Add support for the pcommit instruction Ross Zwisler
2015-01-23 20:40 ` [PATCH v2 2/2] x86: Add support for the clwb instruction Ross Zwisler
2015-01-23 23:03 ` [PATCH v2 0/2] add support for new persistent memory instructions H. Peter Anvin
2015-01-24 11:14   ` Borislav Petkov
2015-01-26 19:59     ` Ross Zwisler
2015-01-26 21:34       ` Borislav Petkov
2015-01-26 21:50         ` Ross Zwisler
2015-01-26 22:39           ` Borislav Petkov
2015-01-26 23:14             ` Ross Zwisler
2015-01-26 19:51   ` Ross Zwisler
2015-01-26 20:05     ` H. Peter Anvin [this message]

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