linux-kernel - Re: [RFC v9 PATCH 00/21] memory-hotplug: hot-remove physical memory

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Date:	Thu, 27 Sep 2012 12:35:58 +0200
From:	Vasilis Liaskovitis <vasilis.liaskovitis@...fitbricks.com>
To:	Wen Congyang <wency@...fujitsu.com>
Cc:	x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
	linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-ia64@...r.kernel.org, cmetcalf@...era.com,
	sparclinux@...r.kernel.org, rientjes@...gle.com, liuj97@...il.com,
	len.brown@...el.com, benh@...nel.crashing.org, paulus@...ba.org,
	cl@...ux.com, minchan.kim@...il.com, akpm@...ux-foundation.org,
	kosaki.motohiro@...fujitsu.com, isimatu.yasuaki@...fujitsu.com
Subject: Re: [RFC v9 PATCH 00/21] memory-hotplug: hot-remove physical memory

On Thu, Sep 27, 2012 at 02:37:14PM +0800, Wen Congyang wrote:
> Hi Vasilis Liaskovitis
> 
> At 09/27/2012 12:46 AM, Vasilis Liaskovitis Wrote:
> > Hi,
> > 
> > I am testing 3.6.0-rc7 with this v9 patchset plus more recent fixes [1],[2],[3]
> > Running in a guest (qemu+seabios from [4]). 
> > CONFIG_SLAB=y
> > CONFIG_DEBUG_SLAB=y
> > 
> > After succesfull hot-add and online, I am doing a hot-remove with "echo 1 > /sys/bus/acpi/devices/PNP/eject"
> > When I do the OSPM-eject, I often get slab corruption in "acpi-state" cache, or in other caches
> 
> I can't reproduce this problem. Can you provide the following information:
> 1. config file
> 2. qemu's command line
> 
> You said you did OSPM-eject. Do you mean write 1 to /sys/bus/acpi/devices/PNP0C80:XX/eject?
yes.

example qemu command line with one dimm:

"/opt/qemu-kvm-memhp/bin/qemu-system-x86_64 -bios
/opt/extra/vliaskov/devel/seabios-upstream/out/bios.bin -enable-kvm -M pc -smp
4,maxcpus=8 -cpu host -m 2048 -drive file=/opt/extra/debian-template.raw,if=none,id=drive-virtio-disk0,format=raw
-device virtio-blk-pci,bus=pci.0,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-vga cirrus -netdev type=tap,id=guest0,vhost=on -device virtio-net-pci,netdev=guest0
-monitor unix:/tmp/qemu.monitor11,server,nowait -chardev stdio,id=seabios  -device
isa-debugcon,iobase=0x402,chardev=seabios
-dimm id=n0,size=512M,node=0"

or last line with 2 numa nodes:
"-dimm id=n0,size=512M,node=0 -dimm id=n1,size=512M,node=1 -numa node,nodeid=0 -numa node,nodeid=1"

attached config. Tree is at:
https://github.com/vliaskov/linux/commits/memhp-fujitsu

thanks,
- Vasilis

View attachment "config-3.6.0-rc7-guest" of type "text/plain" (87661 bytes)