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From: Pingfan Liu <>
To: Dave Young <>
Cc: Andrew Morton <>,
	Baoquan He <>,,,,
Subject: Re: [PATCH 1/2] kdump/x86: crashkernel=X try to reserve below 896M first then below 4G and MAXMEM
Date: Wed, 31 Oct 2018 14:16:50 +0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Hi, I encounter a case where crashkernel=384M, and kaslr is enabled.
During the test, sometimes, the system may fail to reserve region for
crash kernel, although there is much free space above 896MB. It is
caused by the truncation of the candidate region by kaslr kernel. It
raises confusion to the end user that sometimes crashkernel=X works
while sometimes fails.
So can we have this patch to fix the issue?

On Mon, May 7, 2018 at 10:49 AM Dave Young <> wrote:
> On 04/27/18 at 05:14pm, Dave Young wrote:
> > Hi,
> >
> > This is a resend of below patches:
> >
> >
> > I dropped the original patch 1 since Baoquan is not happy with it.
> > For patch 2 (the 1st patch in this series), there is some improvement
> > comment from Baoquan to create some generic memblock iteration function.
> > But nobody has time to work on it for the time being.  According to
> > offline discussion with him.  That can be done in the future if someone
> > is interested.  We can go with the current kdump only fixes.
> >
> > Other than above,  the patches are just same.
> Hi Andrew, do you have concerns about the patches?  It has been used for
> long time in Red Hat kernel, since people do not object them, could you
> pick them if no other concerns?
> Thanks
> Dave

      reply	other threads:[~2018-10-31  6:17 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-27  9:00 dyoung
2018-04-27  9:00 ` [PATCH 2/2] kdump: round up the total memory size to 128M for crashkernel reservation dyoung
2018-04-27  9:14 ` [PATCH 1/2] kdump/x86: crashkernel=X try to reserve below 896M first then below 4G and MAXMEM Dave Young
2018-04-27 23:28   ` Baoquan He
2018-05-07  2:48   ` Dave Young
2018-10-31  6:16     ` Pingfan Liu [this message]

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