#!/usr/bin/env python
import os
from optparse import OptionParser
parser = OptionParser()
parser.add_option("-v", "--verbose", dest="verbose",
help="print verbose messages. Try -vv, -vvv for \
more verbose messages", action="count")
(options, args) = parser.parse_args()
verbose = 0
if options.verbose is not None:
verbose = options.verbose
vmbus_sys_path = '/sys/bus/vmbus/devices'
if not os.path.isdir(vmbus_sys_path):
print "%s doesn't exist: exiting..." % vmbus_sys_path
exit(-1)
vmbus_dev_dict = {
'{0e0b6031-5213-4934-818b-38d90ced39db}' : '[Operating system shutdown]',
'{9527e630-d0ae-497b-adce-e80ab0175caf}' : '[Time Synchronization]',
'{57164f39-9115-4e78-ab55-382f3bd5422d}' : '[Heartbeat]',
'{a9a0f4e7-5a45-4d96-b827-8a841e8c03e6}' : '[Data Exchange]',
'{35fa2e29-ea23-4236-96ae-3a6ebacba440}' : '[Backup (volume checkpoint)]',
'{34d14be3-dee4-41c8-9ae7-6b174977c192}' : '[Guest services]',
'{525074dc-8985-46e2-8057-a307dc18a502}' : '[Dynamic Memory]',
'{cfa8b69e-5b4a-4cc0-b98b-8ba1a1f3f95a}' : 'Synthetic mouse',
'{f912ad6d-2b17-48ea-bd65-f927a61c7684}' : 'Synthetic keyboard',
'{da0a7802-e377-4aac-8e77-0558eb1073f8}' : 'Synthetic framebuffer adapter',
'{f8615163-df3e-46c5-913f-f2d2f965ed0e}' : 'Synthetic network adapter',
'{32412632-86cb-44a2-9b5c-50d1417354f5}' : 'Synthetic IDE Controller',
'{ba6163d9-04a1-4d29-b605-72e2ffb1dc7f}' : 'Synthetic SCSI Controller',
'{2f9bcc4a-0069-4af3-b76b-6fd0be528cda}' : 'Synthetic fiber channel adapter',
'{8c2eaf3d-32a7-4b09-ab99-bd1f1c86b501}' : 'Synthetic RDMA adapter',
'{44c4f61d-4444-4400-9d52-802e27ede19f}' : 'PCI Express pass-through',
'{276aacf4-ac15-426c-98dd-7521ad3f01fe}' : '[Reserved system device]',
'{f8e65716-3cb3-4a06-9a60-1889c5cccab5}' : '[Reserved system device]',
'{3375baf4-9e15-4b30-b765-67acb10d607b}' : '[Reserved system device]',
}
def get_vmbus_dev_attr(dev_name, attr):
try:
f = open('%s/%s/%s' % (vmbus_sys_path, dev_name, attr), 'r')
lines = f.readlines()
f.close()
except IOError:
lines = []
return lines
class VMBus_Dev:
pass
vmbus_dev_list = []
for f in os.listdir(vmbus_sys_path):
vmbus_id = get_vmbus_dev_attr(f, 'id')[0].strip()
class_id = get_vmbus_dev_attr(f, 'class_id')[0].strip()
device_id = get_vmbus_dev_attr(f, 'device_id')[0].strip()
dev_desc = vmbus_dev_dict.get(class_id, 'Unknown')
chn_vp_mapping = get_vmbus_dev_attr(f, 'channel_vp_mapping')
chn_vp_mapping = [c.strip() for c in chn_vp_mapping]
chn_vp_mapping = sorted(chn_vp_mapping,
key = lambda c : int(c.split(':')[0]))
chn_vp_mapping = ['\tRel_ID=%s, target_cpu=%s' %
(c.split(':')[0], c.split(':')[1])
for c in chn_vp_mapping]
d = VMBus_Dev()
d.sysfs_path = '%s/%s' % (vmbus_sys_path, f)
d.vmbus_id = vmbus_id
d.class_id = class_id
d.device_id = device_id
d.dev_desc = dev_desc
d.chn_vp_mapping = '\n'.join(chn_vp_mapping)
if d.chn_vp_mapping:
d.chn_vp_mapping += '\n'
vmbus_dev_list.append(d)
vmbus_dev_list = sorted(vmbus_dev_list, key = lambda d : int(d.vmbus_id))
format0 = '%2s: %s'
format1 = '%2s: Class_ID = %s - %s\n%s'
format2 = '%2s: Class_ID = %s - %s\n\tDevice_ID = %s\n\tSysfs path: %s\n%s'
for d in vmbus_dev_list:
if verbose == 0:
print ('VMBUS ID ' + format0) % (d.vmbus_id, d.dev_desc)
elif verbose == 1:
print ('VMBUS ID ' + format1) % \
(d.vmbus_id, d.class_id, d.dev_desc, d.chn_vp_mapping)
else:
print ('VMBUS ID ' + format2) % \
(d.vmbus_id, d.class_id, d.dev_desc, \
d.device_id, d.sysfs_path, d.chn_vp_mapping)
e'/>tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is
pinned to a single CPU and will move to the next CPU after each period of
running. If the user modifies the migration thread's affinity, it will not
change after that happens.
The original code created the thread at the first instance it was called,
but later was changed to destroy the thread after the tracer was finished,
and would not be created until the next instance of the tracer was
established. The code that initialized the affinity was only called on the
initial instantiation of the tracer. After that, it was not initialized, and
the previous affinity did not match the current newly created one, making
it appear that the user modified the thread's affinity when it did not, and
the thread failed to migrate again.
Cc: stable@vger.kernel.org
Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>