On Thu, 2010-01-14 at 15:11 +0200, Avi Kivity wrote:
> > Strangely, autotest only caught this on AMD and even it took a while.
> > Lucas, can you integrate something like the following into autotest,
> > so we exercise the preemption code harder?
All right Avi, just added it to our TODO list, thanks!
> > #!/usr/bin/python
> >
> > import sys, os, re, random, ctypes, time
> >
> > tasks = sys.argv[1:]
> >
> > threads = [int(t)
> > for k in tasks
> > for t in os.listdir('/proc/%s/task' % (k,))]
> >
> > cpus = [int(c[3:])
> > for c in os.listdir('/sys/devices/system/cpu')
> > if re.match(r'cpu[0-9]+', c)]
> >
> > rand = random.Random()
> >
> > sched_setaffinity = ctypes.CDLL('libc.so.6').sched_setaffinity
> >
> > while True:
> > pid = rand.choice(threads)
> > cpu = rand.choice(cpus)
> > mask = 1 << cpu
> > sched_setaffinity(ctypes.c_int(pid), ctypes.c_size_t(4),
> > ctypes.byref(ctypes.c_int(mask)))
> > try:
> > time.sleep(0.01)
> > except:
> > break
> >
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