From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lgeamrelo13.lge.com (LGEAMRELO13.lge.com [156.147.23.53]) by ml01.01.org (Postfix) with ESMTP id BC676209589C8 for ; Thu, 3 Aug 2017 17:55:39 -0700 (PDT) Date: Fri, 4 Aug 2017 09:57:49 +0900 From: Minchan Kim Subject: Re: [PATCH 0/3] remove rw_page() from brd, pmem and btt Message-ID: <20170804005749.GA8368@bbox> References: <20170728165604.10455-1-ross.zwisler@linux.intel.com> <20170728173143.GE15980@bombadil.infradead.org> <20170802221359.GA20666@linux.intel.com> <20170803001315.GF32020@bbox> <20170803080544.GA19916@lst.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20170803080544.GA19916@lst.de> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: Christoph Hellwig Cc: Jens Axboe , Jerome Marchand , linux-nvdimm@lists.01.org, Dave Chinner , linux-kernel@vger.kernel.org, Matthew Wilcox , seungho1.park@lge.com, Jan Kara , "karam . lee" , Andrew Morton , Nitin Gupta List-ID: On Thu, Aug 03, 2017 at 10:05:44AM +0200, Christoph Hellwig wrote: > FYI, for the read side we should use the on-stack bio unconditionally, > as it will always be a win (or not show up at all). Think about readahead. Unconditional on-stack bio to read around pages with faulted address will cause latency peek. So, I want to use that synchronous IO only if device says "Hey, I'm a synchronous". _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm