From: Michal Hocko <mhocko@kernel.org>
To: Baoquan He <bhe@redhat.com>
Cc: nicolas.pitre@linaro.org, brijesh.singh@amd.com,
devicetree@vger.kernel.org, airlied@linux.ie,
linux-pci@vger.kernel.org, richard.weiyang@gmail.com,
keith.busch@intel.com, jcmvbkbc@gmail.com,
baiyaowei@cmss.chinamobile.com, kys@microsoft.com,
frowand.list@gmail.com, dan.j.williams@intel.com,
lorenzo.pieralisi@arm.com, sthemmin@microsoft.com,
linux-nvdimm@lists.01.org, patrik.r.jakobsson@gmail.com,
andy.shevchenko@gmail.com, linux-input@vger.kernel.org,
gustavo@padovan.org, bp@suse.de, dyoung@redhat.com,
vgoyal@redhat.com, thomas.lendacky@amd.com,
haiyangz@microsoft.com, maarten.lankhorst@linux.intel.com,
josh@joshtriplett.org, jglisse@redhat.com, robh+dt@kernel.org,
seanpaul@chromium.org, bhelgaas@google.com, tglx@linutronix.de,
yinghai@kernel.org, jonathan.derrick@intel.com, chris@zankel.net,
monstr@monstr.eu, linux-parisc@vger.kernel.org,
gregkh@linuxfoundation.org, dmitry.torokhov@gmail.com,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
ebiederm@xmission.com, devel@linuxdriverproject.org,
Andrew Morton <akpm@linux-foundation.org>,
fengguang.wu@intel.com, linuxppc-dev@lists.ozlabs.org,
davem@davemloft.net
Subject: Re: [PATCH v7 4/4] kexec_file: Load kernel at top of system RAM if required
Date: Mon, 23 Jul 2018 16:34:43 +0200 [thread overview]
Message-ID: <20180723143443.GD18181@dhcp22.suse.cz> (raw)
In-Reply-To: <20180719151753.GB7147@localhost.localdomain>
On Thu 19-07-18 23:17:53, Baoquan He wrote:
> Kexec has been a formal feature in our distro, and customers owning
> those kind of very large machine can make use of this feature to speed
> up the reboot process. On uefi machine, the kexec_file loading will
> search place to put kernel under 4G from top to down. As we know, the
> 1st 4G space is DMA32 ZONE, dma, pci mmcfg, bios etc all try to consume
> it. It may have possibility to not be able to find a usable space for
> kernel/initrd. From the top down of the whole memory space, we don't
> have this worry.
I do not have the full context here but let me note that you should be
careful when doing top-down reservation because you can easily get into
hotplugable memory and break the hotremove usecase. We even warn when
this is done. See memblock_find_in_range_node
--
Michal Hocko
SUSE Labs
_______________________________________________
kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2018-07-23 14:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180718024944.577-1-bhe@redhat.com>
2018-07-18 2:49 ` [PATCH v7 4/4] kexec_file: Load kernel at top of system RAM if required Baoquan He
2018-07-18 22:33 ` Andrew Morton
2018-07-19 15:17 ` Baoquan He
2018-07-19 19:44 ` Andrew Morton
2018-07-25 2:21 ` Baoquan He
2018-07-23 14:34 ` Michal Hocko [this message]
2018-07-25 6:48 ` Baoquan He
2018-07-26 12:59 ` Michal Hocko
2018-07-26 13:09 ` Baoquan He
2018-07-26 13:12 ` Michal Hocko
2018-07-26 13:14 ` Michal Hocko
2018-07-26 13:37 ` Baoquan He
2018-07-26 14:01 ` Michal Hocko
2018-07-26 15:10 ` Baoquan He
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180723143443.GD18181@dhcp22.suse.cz \
--to=mhocko@kernel.org \
--cc=airlied@linux.ie \
--cc=akpm@linux-foundation.org \
--cc=andy.shevchenko@gmail.com \
--cc=baiyaowei@cmss.chinamobile.com \
--cc=bhe@redhat.com \
--cc=bhelgaas@google.com \
--cc=bp@suse.de \
--cc=brijesh.singh@amd.com \
--cc=chris@zankel.net \
--cc=dan.j.williams@intel.com \
--cc=davem@davemloft.net \
--cc=devel@linuxdriverproject.org \
--cc=devicetree@vger.kernel.org \
--cc=dmitry.torokhov@gmail.com \
--cc=dyoung@redhat.com \
--cc=ebiederm@xmission.com \
--cc=fengguang.wu@intel.com \
--cc=frowand.list@gmail.com \
--cc=gregkh@linuxfoundation.org \
--cc=gustavo@padovan.org \
--cc=haiyangz@microsoft.com \
--cc=jcmvbkbc@gmail.com \
--cc=jglisse@redhat.com \
--cc=jonathan.derrick@intel.com \
--cc=josh@joshtriplett.org \
--cc=keith.busch@intel.com \
--cc=kexec@lists.infradead.org \
--cc=kys@microsoft.com \
--cc=linux-input@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nvdimm@lists.01.org \
--cc=linux-parisc@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=maarten.lankhorst@linux.intel.com \
--cc=monstr@monstr.eu \
--cc=nicolas.pitre@linaro.org \
--cc=patrik.r.jakobsson@gmail.com \
--cc=richard.weiyang@gmail.com \
--cc=robh+dt@kernel.org \
--cc=seanpaul@chromium.org \
--cc=sthemmin@microsoft.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=vgoyal@redhat.com \
--cc=yinghai@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox