From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from relay3.sgi.com ([192.48.152.1] helo=relay.sgi.com) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1W2hbV-000792-4W for kexec@lists.infradead.org; Mon, 13 Jan 2014 13:30:58 +0000 Date: Mon, 13 Jan 2014 07:30:33 -0600 From: Cliff Wickman Subject: Re: [PATCH 1/2 V2] raw i/o and root device to use less memory Message-ID: <20140113133033.GA917@sgi.com> References: <20140110175830.GA7498@sgi.com> <20140113105831.57412728@holzheu> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20140113105831.57412728@holzheu> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: Michael Holzheu Cc: kumagai-atsushi@mxc.nes.nec.co.jp, d.hatayama@jp.fujitsu.com, kexec@lists.infradead.org On Mon, Jan 13, 2014 at 10:58:31AM +0100, Michael Holzheu wrote: > On Fri, 10 Jan 2014 11:58:30 -0600 > Cliff Wickman wrote: > > [snip] > > > Use O_DIRECT (raw) i/o for the dump and for the bitmaps file, so that writing > > to those files does not allocate kernel memory for page cache. > > Hello Cliff, > > Have you tested O_DIRECT together with the new vmcore mmap interface? > IIRC when we tried O_DIRECT together with mmap for some reason it did > not work. > > Michael Hi Michael, How new of a kernel do I need? i.e. how 'new' of an mmap interface? The latest kernel I used was 3.0.93 (sle11sp3). And makedumpfile was 1.5.5. -Cliff -- Cliff Wickman SGI cpw@sgi.com (651) 683-3824 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec