[Xen-devel] Re: Xen-devel Digest, Vol 52, Issue 178

Hi, all

I want to reduce the checkpoint size of a VM by memory exclusion. I try to find out all the free pages by reference count at VMM-level, As they declared that:

/* Page is on a free list: ((count_info & PGC_count_mask) == 0). */ , in struct page_info which is defined in /xen/include/asm-x86/mm.h, but unfortunately, all the pages in a idle VM accords with this condition. I prints out the reference count of all memory pages, all of them are equal to or bigger than 2. Anyone can tell me the reason? and how can I find out the free pages in a guest OS?

best regards

haikun liu

2009-07-16

发件人： xen-devel-request@xxxxxxxxxxxxxxxxxxx

发送时间： 2009-06-17 19:45:40

收件人： xen-devel@xxxxxxxxxxxxxxxxxxx

抄送：

主题： Xen-devel Digest, Vol 52, Issue 178

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Today's Topics:

1. Qemu nic rate limit (=?gb2312?B?yfLG9MH6?=)

2. [PATCH] xend: pci: find_parent: should return string rather

than int (Cui, Dexuan)

3. Re: [PATCH] xend: pci: find_parent: should return string

rather than int (Simon Horman)

4. RE: [PATCH] xend: pci: find_parent: should return string

rather than int (Cui, Dexuan)

----------------------------------------------------------------------

Message: 1

Date: Wed, 17 Jun 2009 17:40:35 +0800

From: =?gb2312?B?yfLG9MH6?= <shen.qilong@xxxxxxxxxxxx >

Subject: [Xen-devel] Qemu nic rate limit

To: <xen-devel@xxxxxxxxxxxxxxxxxxx >

Message-ID: <002801c9ef2f$aa158c10$0138a8c0@freecloud >

Content-Type: text/plain; charset="gb2312"

I want to limit my NIC rate in DomU. I had found some paper and done some

test. Now I can limit NIC rate in DomU which had installed PV driver, but I

can’t limit NIC rate in DomU which had the NIC emulated by qemu.

Can anyone help me to limit the nic (qemu created) rate in domU.

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Message: 2

Date: Wed, 17 Jun 2009 19:02:27 +0800

From: "Cui, Dexuan" <dexuan.cui@xxxxxxxxx >

Subject: [Xen-devel] [PATCH] xend: pci: find_parent: should return

string rather than int

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx >, Simon Horman

<horms@xxxxxxxxxxxx >

Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx >

Message-ID:

<EADF0A36011179459010BDF5142A457501C9E2AFB5@xxxxxxxxxxxxxxxxxxxxxxxxxxxx >

Content-Type: text/plain; charset="gb2312"

Using changeset 19783: 61ec78692b13, device assignment can't work:

e.g., in find_the_uppermost_pci_bridge(),

parent = dev_parent.find_parent()

...

dev_parent = PciDevice(parent),

we can see parent['domain'] is int and in PciDevice's __init__, int(dev['domain'], 16) would fail:

TypeError: int() can't convert non-string with explicit base

The patch fixes the issue.

Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx >

diff -r 61ec78692b13 tools/python/xen/util/pci.py

--- a/tools/python/xen/util/pci.py Wed Jun 17 07:39:27 2009 +0100

+++ b/tools/python/xen/util/pci.py Wed Jun 17 18:35:31 2009 +0800

@@ -547,12 +547,12 @@ class PciDevice:

else:

dev = {}

lst = parent.split(':')

- dev['domain'] = int(lst[0], 16)

- dev['bus'] = int(lst[1], 16)

+ dev['domain'] = '%04x' % int(lst[0], 16)

+ dev['bus'] = '%02x' % int(lst[1], 16)

lst = lst[2]

lst = lst.split('.')

- dev['slot'] = int(lst[0], 16)

- dev['func'] = int(lst[1], 16)

+ dev['slot'] = '%02x' % int(lst[0], 16)

+ dev['func'] = '%x' % int(lst[1], 16)

return dev

except OSError, (errno, strerr):

raise PciDeviceParseError('Can not locate the parent of %s',

------------------------------

Message: 3

Date: Wed, 17 Jun 2009 21:31:08 +1000

From: Simon Horman <horms@xxxxxxxxxxxx >

Subject: [Xen-devel] Re: [PATCH] xend: pci: find_parent: should return

string rather than int

To: "Cui, Dexuan" <dexuan.cui@xxxxxxxxx >

Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx >,

Keir Fraser <keir.fraser@xxxxxxxxxxxxx >

Message-ID: <20090617113102.GA3504@xxxxxxxxxxxx >

Content-Type: text/plain; charset=us-ascii

On Wed, Jun 17, 2009 at 07:02:27PM +0800, Cui, Dexuan wrote:

> Using changeset 19783: 61ec78692b13, device assignment can't work:

> e.g., in find_the_uppermost_pci_bridge(),

> parent = dev_parent.find_parent()

> ...

> dev_parent = PciDevice(parent),

> we can see parent['domain'] is int and in PciDevice's __init__, int(dev['domain'], 16) would fail:

> TypeError: int() can't convert non-string with explicit base

> The patch fixes the issue.

Hi Dexuan,

sorry about that. The fix looks good to me.

Could you tell me a bit about what config/command you

ran to produce this problem? I'd like to add something

to the tests that I run.

Acked-by: Simon Horman <horms@xxxxxxxxxxxx >

> diff -r 61ec78692b13 tools/python/xen/util/pci.py

> --- a/tools/python/xen/util/pci.py Wed Jun 17 07:39:27 2009 +0100

> +++ b/tools/python/xen/util/pci.py Wed Jun 17 18:35:31 2009 +0800

> @@ -547,12 +547,12 @@ class PciDevice:

> else:

> dev = {}

> lst = parent.split(':')

> - dev['domain'] = int(lst[0], 16)

> - dev['bus'] = int(lst[1], 16)

> + dev['domain'] = '%04x' % int(lst[0], 16)

> + dev['bus'] = '%02x' % int(lst[1], 16)

> lst = lst[2]

> lst = lst.split('.')

> - dev['slot'] = int(lst[0], 16)

> - dev['func'] = int(lst[1], 16)

> + dev['slot'] = '%02x' % int(lst[0], 16)

> + dev['func'] = '%x' % int(lst[1], 16)

> return dev

> except OSError, (errno, strerr):

> raise PciDeviceParseError('Can not locate the parent of %s',

------------------------------

Message: 4

Date: Wed, 17 Jun 2009 19:40:47 +0800

From: "Cui, Dexuan" <dexuan.cui@xxxxxxxxx >

Subject: [Xen-devel] RE: [PATCH] xend: pci: find_parent: should return

string rather than int

To: Simon Horman <horms@xxxxxxxxxxxx >

Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx >,

Keir Fraser <keir.fraser@xxxxxxxxxxxxx >

Message-ID:

<EADF0A36011179459010BDF5142A457501C9E2AFB7@xxxxxxxxxxxxxxxxxxxxxxxxxxxx >

Content-Type: text/plain; charset="us-ascii"

Hi Simon,

Attached is my host info of 'lspci'.

I pciback.hide 01:00.0 and 00:1b.0 and when I tried to statically assign 01:00.0 to guest, I got the " TypeError: int() can't convert non-string with explicit base".

Thanks,

-- Dexuan

-----Original Message-----

From: Simon Horman [mailto:horms@xxxxxxxxxxxx]

Sent: 2009?6?17? 19:31

To: Cui, Dexuan

Cc: Keir Fraser; xen-devel@xxxxxxxxxxxxxxxxxxx

Subject: Re: [PATCH] xend: pci: find_parent: should return string rather than int

On Wed, Jun 17, 2009 at 07:02:27PM +0800, Cui, Dexuan wrote:

> Using changeset 19783: 61ec78692b13, device assignment can't work:

> e.g., in find_the_uppermost_pci_bridge(),

> parent = dev_parent.find_parent()

> ...

> dev_parent = PciDevice(parent),

> we can see parent['domain'] is int and in PciDevice's __init__, int(dev['domain'], 16) would fail:

> TypeError: int() can't convert non-string with explicit base

> The patch fixes the issue.

Hi Dexuan,

sorry about that. The fix looks good to me.

Could you tell me a bit about what config/command you

ran to produce this problem? I'd like to add something

to the tests that I run.

Acked-by: Simon Horman <horms@xxxxxxxxxxxx >

> diff -r 61ec78692b13 tools/python/xen/util/pci.py

> --- a/tools/python/xen/util/pci.py Wed Jun 17 07:39:27 2009 +0100

> +++ b/tools/python/xen/util/pci.py Wed Jun 17 18:35:31 2009 +0800

> @@ -547,12 +547,12 @@ class PciDevice:

> else:

> dev = {}

> lst = parent.split(':')

> - dev['domain'] = int(lst[0], 16)

> - dev['bus'] = int(lst[1], 16)

> + dev['domain'] = '%04x' % int(lst[0], 16)

> + dev['bus'] = '%02x' % int(lst[1], 16)

> lst = lst[2]

> lst = lst.split('.')

> - dev['slot'] = int(lst[0], 16)

> - dev['func'] = int(lst[1], 16)

> + dev['slot'] = '%02x' % int(lst[0], 16)

> + dev['func'] = '%x' % int(lst[1], 16)

> return dev

> except OSError, (errno, strerr):

> raise PciDeviceParseError('Can not locate the parent of %s',

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[Xen-devel] Re: Xen-devel Digest, Vol 52, Issue 178