From mboxrd@z Thu Jan  1 00:00:00 1970
Return-path: <kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org>
Received: from mx1.redhat.com ([209.132.183.28])
 by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux))
 id 1VZQX3-00035J-W4
 for kexec@lists.infradead.org; Thu, 24 Oct 2013 19:25:23 +0000
Date: Thu, 24 Oct 2013 15:24:46 -0400
From: Vivek Goyal <vgoyal@redhat.com>
Subject: Re: [PATCH] x86, kdump: crashkernel=X try to reserve below 896M
 first, then try below 4G, then MAXMEM
Message-ID: <20131024192446.GF2322@redhat.com>
References: <1381751200-27376-1-git-send-email-chaowang@redhat.com>
 <CAE9FiQUNMDuVZtqud3LBbAmE0SL8ZWLFnc+CSYZm4UfTvNUaOA@mail.gmail.com>
 <20131015144810.GI31215@redhat.com>
 <CAE9FiQXVCx__SuhAdO9_CNaRncW2HB2tv3UjZrQcbsTV35QWow@mail.gmail.com>
 <20131018123837.GB2277@redhat.com>
 <CAE9FiQWdMmSseDk6J=TOXT9ZahJUBf2BOU+VHJRXeeMofgH=EQ@mail.gmail.com>
 <20131021151643.GA20669@redhat.com>
 <CAE9FiQVfeUdugFRMt1DGjtqW2FAb2gfnGjXENHjoJ=JVAYbYgw@mail.gmail.com>
 <20131024110117.GB3033@dhcp16-109.nay.redhat.com>
 <CAE9FiQW=WLvBKgdWkKNaka=ZC1FLxYAtXc2W2zqNEKhHR2VSNQ@mail.gmail.com>
MIME-Version: 1.0
Content-Disposition: inline
In-Reply-To: <CAE9FiQW=WLvBKgdWkKNaka=ZC1FLxYAtXc2W2zqNEKhHR2VSNQ@mail.gmail.com>
List-Id: <kexec.lists.infradead.org>
List-Unsubscribe: <http://lists.infradead.org/mailman/options/kexec>,
 <mailto:kexec-request@lists.infradead.org?subject=unsubscribe>
List-Archive: <http://lists.infradead.org/pipermail/kexec/>
List-Post: <mailto:kexec@lists.infradead.org>
List-Help: <mailto:kexec-request@lists.infradead.org?subject=help>
List-Subscribe: <http://lists.infradead.org/mailman/listinfo/kexec>,
 <mailto:kexec-request@lists.infradead.org?subject=subscribe>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Sender: "kexec" <kexec-bounces@lists.infradead.org>
Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org
To: Yinghai Lu <yinghai@kernel.org>
Cc: "kexec@lists.infradead.org" <kexec@lists.infradead.org>, Jacob Shin <jacob.shin@amd.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Pekka Enberg <penberg@kernel.org>, Ingo Molnar <mingo@redhat.com>, "Eric W. Biederman" <ebiederm@xmission.com>, "H. Peter Anvin" <hpa@zytor.com>, Thomas Gleixner <tglx@linutronix.de>, Andrew Morton <akpm@linux-foundation.org>, WANG Chao <chaowang@redhat.com>

On Thu, Oct 24, 2013 at 12:13:41PM -0700, Yinghai Lu wrote:

[..]
> old kexec-tools could work cross 892M in some case.
> That will confuse the user,

If it could work beyong 892MB, then why are you limiting user to 896MB
only. That sounds wrong.

> as it works some time on some setup, but does
> not work on other setup.

If it can work above 896MB, then those other setup should be fixed.

All the existing users of crashkernel=xM *will not* be affected by this
change. Memory reservation will still be below 892MB.

Memory reservation will gove above 896MB, only if user chooses to reserve
more memory. If kexec works in that case, its a win-win situation. If it
does not and fails, then it is status quo is maintained.

Thanks
Vivek

_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec