mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-24 12:09:58 +00:00
dc2b651a0b
Render block nodes graph with help of graphviz. This new function is for debugging, so there is no sense to put it into qemu.py as a method of QEMUMachine. Let's instead put it separately. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Acked-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 20181221170909.25584-3-vsementsov@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
121 lines
3.6 KiB
Python
Executable File
121 lines
3.6 KiB
Python
Executable File
#!/usr/bin/env python
|
|
#
|
|
# Render Qemu Block Graph
|
|
#
|
|
# Copyright (c) 2018 Virtuozzo International GmbH. All rights reserved.
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
#
|
|
|
|
import os
|
|
import sys
|
|
import subprocess
|
|
import json
|
|
from graphviz import Digraph
|
|
from qemu import MonitorResponseError
|
|
|
|
|
|
def perm(arr):
|
|
s = 'w' if 'write' in arr else '_'
|
|
s += 'r' if 'consistent-read' in arr else '_'
|
|
s += 'u' if 'write-unchanged' in arr else '_'
|
|
s += 'g' if 'graph-mod' in arr else '_'
|
|
s += 's' if 'resize' in arr else '_'
|
|
return s
|
|
|
|
|
|
def render_block_graph(qmp, filename, format='png'):
|
|
'''
|
|
Render graph in text (dot) representation into "@filename" and
|
|
representation in @format into "@filename.@format"
|
|
'''
|
|
|
|
bds_nodes = qmp.command('query-named-block-nodes')
|
|
bds_nodes = {n['node-name']: n for n in bds_nodes}
|
|
|
|
job_nodes = qmp.command('query-block-jobs')
|
|
job_nodes = {n['device']: n for n in job_nodes}
|
|
|
|
block_graph = qmp.command('x-debug-query-block-graph')
|
|
|
|
graph = Digraph(comment='Block Nodes Graph')
|
|
graph.format = format
|
|
graph.node('permission symbols:\l'
|
|
' w - Write\l'
|
|
' r - consistent-Read\l'
|
|
' u - write - Unchanged\l'
|
|
' g - Graph-mod\l'
|
|
' s - reSize\l'
|
|
'edge label scheme:\l'
|
|
' <child type>\l'
|
|
' <perm>\l'
|
|
' <shared_perm>\l', shape='none')
|
|
|
|
for n in block_graph['nodes']:
|
|
if n['type'] == 'block-driver':
|
|
info = bds_nodes[n['name']]
|
|
label = n['name'] + ' [' + info['drv'] + ']'
|
|
if info['drv'] == 'file':
|
|
label += '\n' + os.path.basename(info['file'])
|
|
shape = 'ellipse'
|
|
elif n['type'] == 'block-job':
|
|
info = job_nodes[n['name']]
|
|
label = info['type'] + ' job (' + n['name'] + ')'
|
|
shape = 'box'
|
|
else:
|
|
assert n['type'] == 'block-backend'
|
|
label = n['name'] if n['name'] else 'unnamed blk'
|
|
shape = 'box'
|
|
|
|
graph.node(str(n['id']), label, shape=shape)
|
|
|
|
for e in block_graph['edges']:
|
|
label = '%s\l%s\l%s\l' % (e['name'], perm(e['perm']),
|
|
perm(e['shared-perm']))
|
|
graph.edge(str(e['parent']), str(e['child']), label=label)
|
|
|
|
graph.render(filename)
|
|
|
|
|
|
class LibvirtGuest():
|
|
def __init__(self, name):
|
|
self.name = name
|
|
|
|
def command(self, cmd):
|
|
# only supports qmp commands without parameters
|
|
m = {'execute': cmd}
|
|
ar = ['virsh', 'qemu-monitor-command', self.name, json.dumps(m)]
|
|
|
|
reply = json.loads(subprocess.check_output(ar))
|
|
|
|
if 'error' in reply:
|
|
raise MonitorResponseError(reply)
|
|
|
|
return reply['return']
|
|
|
|
|
|
if __name__ == '__main__':
|
|
obj = sys.argv[1]
|
|
out = sys.argv[2]
|
|
|
|
if os.path.exists(obj):
|
|
# assume unix socket
|
|
qmp = QEMUMonitorProtocol(obj)
|
|
qmp.connect()
|
|
else:
|
|
# assume libvirt guest name
|
|
qmp = LibvirtGuest(obj)
|
|
|
|
render_block_graph(qmp, out)
|