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From: "H. Peter Anvin" <h.peter.anvin@intel.com>
To: Ross Zwisler <ross.zwisler@linux.intel.com>,
	linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH v3 2/2] x86: Add support for the clwb instruction
Date: Wed, 11 Feb 2015 14:25:25 -0800	[thread overview]
Message-ID: <54DBD6D5.9060804@intel.com> (raw)
In-Reply-To: <1422377631-8986-3-git-send-email-ross.zwisler@linux.intel.com>

On 01/27/2015 08:53 AM, Ross Zwisler wrote:
> Add support for the new clwb (cache line write back) instruction.  This
> instruction was announced in the document "Intel Architecture
> Instruction Set Extensions Programming Reference" with reference number
> 319433-022.
> 
> https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf
> 
> The clwb instruction is used to write back the contents of dirtied cache
> lines to memory without evicting the cache lines from the processor's
> cache hierarchy.  This should be used in favor of clflushopt or clflush
> in cases where you require the cache line to be written to memory but
> plan to access the data again in the near future.
> 
> One of the main use cases for this is with persistent memory where clwb
> can be used with pcommit to ensure that data has been accepted to memory
> and is durable on the DIMM.

Acked-by: H. Peter Anvin <hpa@linux.intel.com>



  parent reply	other threads:[~2015-02-11 22:25 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-27 16:53 [PATCH v3 0/2] add support for new persistent memory instructions Ross Zwisler
2015-01-27 16:53 ` [PATCH v3 1/2] x86: Add support for the pcommit instruction Ross Zwisler
2015-01-28 10:58   ` Borislav Petkov
2015-01-28 17:10   ` Elliott, Robert (Server Storage)
2015-01-28 17:21     ` Borislav Petkov
2015-01-28 17:27       ` Ross Zwisler
2015-02-11 22:24   ` H. Peter Anvin
2015-02-19  0:29   ` [tip:x86/asm] " tip-bot for Ross Zwisler
2015-02-19  1:15     ` Ingo Molnar
2015-02-19 17:21       ` Ross Zwisler
2015-02-19 17:33         ` Borislav Petkov
2015-02-19 17:41           ` Ross Zwisler
2015-01-27 16:53 ` [PATCH v3 2/2] x86: Add support for the clwb instruction Ross Zwisler
2015-01-28 10:58   ` Borislav Petkov
2015-02-11 22:25   ` H. Peter Anvin [this message]
2015-02-19  0:29   ` [tip:x86/asm] " tip-bot for Ross Zwisler
2015-04-02 20:31     ` Ross Zwisler
2015-04-03  5:04       ` Ingo Molnar
2015-04-03  5:10   ` [tip:x86/asm] x86/asm: Add support for the CLWB instruction tip-bot for Ross Zwisler
2015-02-05 16:24 ` [PATCH v3 0/2] add support for new persistent memory instructions Ross Zwisler

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