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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Question about the tools/misc/xen-hptool
Hi,
I'm trying to use the xen-hptool to make one memory page offline. I
tried to search around to see how to use this tool but didn't find any
manual/tutorial about it.
I had a look at the code of xen-hptool.c and tried the command
'xen-hptool mem-offline' but it does not work (probably because of
incorrect system configuration IMO). I really appreciate if anyone
could guide me a little bit on how to use this tool. (Maybe a wiki
page about how to use this tool will be beneficial?)
I used the latest Xen code in staging branch of xen repository. I
created a guest PV domain vm1 on Xen with credit scheduler.
I first find on page of dom1 which is mfn=0x16c47a by using xen-mfndump tool.
# xen-mfndump dump-p2m 1
--- Dumping P2M for domain 1 ---
Guest Width: 8, PT Levels: 4 P2M size: = 262144
...(omit the output of other pfn entries)
pfn=0x1a ==> mfn=0x16c47a (type 0x0)
...(omit the output of other pfn entries)
I want to make mfn 0x16c47a offline, so I issue this following command:
# xen-hptool mem-offline 0x16c47a
Prepare to offline MEMORY mfn 16c47a
DOM1: No suspend port, try live migration
Failed to suspend guest 1 for mfn 16c47a
I checked the output of 'xenstore-ls', and found that dom1 does not
set up the suspend channel.
This is the part of output of xenstore-ls for dom1
device = ""
suspend = ""
event-channel = ""
I'm guessing this is the reason why xen-hptool mem-offline does not work.
===My question are:===
1) How should I set up the dom1 so that the xen-hptool mem-offline
could work and solve this above issue? In other words, how should I
configure the suspend event-channel for dom1?
(I'm not so familiar with the event channel mechanism in Xen. Any
advice/help on how to make this work is really appreciated.)
2) Can I use the libxl_domain_suspend(ctx, domid, fd, 0, NULL) to
suspend the domain instead of using the event channel?
3) Do I have to suspend the guest domain before making one page of the
domain offline? Can I just pause the domain and make the page offline?
===========
Below is the output of the command `xenstore-ls` in case you need
more information.
local = ""
domain = ""
0 = ""
domid = "0"
name = "Domain-0"
device-model = ""
0 = ""
state = "running"
libxl = ""
disable_udev = "1"
backend = ""
vbd = ""
1 = ""
51712 = ""
frontend = "/local/domain/1/device/vbd/51712"
params = "/home/pennpanda/Research/rt-xen/images/vm1.img"
script = "/etc/xen/scripts/block"
frontend-id = "1"
online = "1"
removable = "0"
bootable = "1"
state = "4"
dev = "xvda"
type = "phy"
mode = "w"
device-type = "disk"
discard-enable = "1"
node = "/dev/loop0"
physical-device = "7:0"
hotplug-status = "connected"
feature-flush-cache = "1"
discard-granularity = "4096"
discard-alignment = "0"
discard-secure = "0"
feature-discard = "1"
feature-barrier = "1"
feature-persistent = "1"
feature-max-indirect-segments = "256"
sectors = "52428800"
info = "0"
sector-size = "512"
physical-sector-size = "512"
console = ""
1 = ""
0 = ""
frontend = "/local/domain/1/console"
frontend-id = "1"
online = "1"
state = "1"
protocol = "vt100"
vif = ""
1 = ""
0 = ""
frontend = "/local/domain/1/device/vif/0"
frontend-id = "1"
online = "1"
state = "4"
script = "/etc/xen/scripts/vif-bridge"
mac = "00:16:3e:0f:49:33"
bridge = "xenbr0"
handle = "0"
type = "vif"
feature-sg = "1"
feature-gso-tcpv4 = "1"
feature-rx-copy = "1"
feature-rx-flip = "0"
feature-split-event-channels = "1"
hotplug-status = "connected"
1 = ""
vm = "/vm/72df1959-a67e-4606-8a0b-cc18a9864f31"
name = "vm1"
cpu = ""
0 = ""
availability = "online"
1 = ""
availability = "online"
memory = ""
static-max = "1048576"
target = "1048576"
videoram = "0"
device = ""
suspend = ""
event-channel = ""
vbd = ""
51712 = ""
backend = "/local/domain/0/backend/vbd/1/51712"
backend-id = "0"
state = "4"
virtual-device = "51712"
device-type = "disk"
protocol = "x86_64-abi"
ring-ref = "8"
event-channel = "15"
vif = ""
0 = ""
backend = "/local/domain/0/backend/vif/1/0"
backend-id = "0"
state = "4"
handle = "0"
mac = "00:16:3e:0f:49:33"
tx-ring-ref = "768"
rx-ring-ref = "769"
event-channel = "16"
request-rx-copy = "1"
feature-rx-notify = "1"
feature-sg = "1"
feature-gso-tcpv4 = "1"
control = ""
shutdown = ""
platform-feature-multiprocessor-suspend = "1"
platform-feature-xs_reset_watches = "1"
data = ""
domid = "1"
store = ""
port = "1"
ring-ref = "890009"
console = ""
backend = "/local/domain/0/backend/console/1/0"
backend-id = "0"
limit = "1048576"
type = "xenconsoled"
output = "pty"
tty = "/dev/pts/2"
port = "2"
ring-ref = "890008"
vm = ""
72df1959-a67e-4606-8a0b-cc18a9864f31 = ""
name = "vm1"
uuid = "72df1959-a67e-4606-8a0b-cc18a9864f31"
image = ""
ostype = "linux"
kernel = "/var/run/xen/bootloader.1.d/boot_kernel.LnHjpE"
ramdisk = "/var/run/xen/bootloader.1.d/boot_ramdisk.WvGsmT"
cmdline = "root=UUID=396d8dd9-b4b3-4353-9377-9b1030119fea ro
quiet splash $vt_handoff"
start_time = "1429294893.15"
libxl = ""
1 = ""
dm-version = "qemu_xen"
Thank you very much and best regards!
Meng
-----------
Meng Xu
PhD Student in Computer and Information Science
University of Pennsylvania
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