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Re: [Qemu-devel] [PATCH] migration: Make analyze-migration script target
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH] migration: Make analyze-migration script target-page-size aware |
Date: |
Fri, 7 Jul 2017 16:00:11 +0100 |
User-agent: |
Mutt/1.8.3 (2017-05-23) |
* Alexander Graf (address@hidden) wrote:
> The configuration section has a new subsection to transmit the target page
> size along with the migration stream. The analyze migration script needs
> to learn about that to read configuration streams that were triggering
> this subsection to get transmitted.
>
> With this patch applied, I can successfully analyze migration streams
> on AArch64 again.
>
> Signed-off-by: Alexander Graf <address@hidden>
> ---
> scripts/analyze-migration.py | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/scripts/analyze-migration.py b/scripts/analyze-migration.py
> index 1455387..02784f2 100755
> --- a/scripts/analyze-migration.py
> +++ b/scripts/analyze-migration.py
> @@ -254,12 +254,25 @@ class HTABSection(object):
(Note I'm not a particularly python person, so take lightly)
> class ConfigurationSection(object):
> + QEMU_VM_SUBSECTION = 0x05
> +
It's odd, you already have this constant defined twice in this script.
> def __init__(self, file):
> self.file = file
>
> def read(self):
> name_len = self.file.read32()
> name = self.file.readstr(len = name_len)
> + oldpos = self.file.tell()
> + if self.file.read8() == self.QEMU_VM_SUBSECTION:
> + name = self.file.readstr()
> + version_id = self.file.read32()
> + if name == "configuration/target-page-bits":
> + target_page_size = self.file.read32()
All of your other references to target_page_size in the script
are self.TARGET_PAGE_SIZE.
You might want to make the conditional subsection check into a function
somewhere, but that's OK for now.
Dave
> + else:
> + raise Exception("Unknown config subsection: %s" % name)
> + else:
> + # No subsection following, forget that we ever read anything
> + self.file.seek(oldpos)
>
> class VMSDFieldGeneric(object):
> def __init__(self, desc, file):
> --
> 1.8.5.6
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK