1#
2# Migration test main engine
3#
4# Copyright (c) 2016 Red Hat, Inc.
5#
6# This library is free software; you can redistribute it and/or
7# modify it under the terms of the GNU Lesser General Public
8# License as published by the Free Software Foundation; either
9# version 2.1 of the License, or (at your option) any later version.
10#
11# This library is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14# Lesser General Public License for more details.
15#
16# You should have received a copy of the GNU Lesser General Public
17# License along with this library; if not, see <http://www.gnu.org/licenses/>.
18#
19
20
21import os
22import re
23import sys
24import time
25
26from guestperf.progress import Progress, ProgressStats
27from guestperf.report import Report
28from guestperf.timings import TimingRecord, Timings
29
30sys.path.append(os.path.join(os.path.dirname(__file__),
31                             '..', '..', '..', 'python'))
32from qemu.machine import QEMUMachine
33
34
35class Engine(object):
36
37    def __init__(self, binary, dst_host, kernel, initrd, transport="tcp",
38                 sleep=15, verbose=False, debug=False):
39
40        self._binary = binary # Path to QEMU binary
41        self._dst_host = dst_host # Hostname of target host
42        self._kernel = kernel # Path to kernel image
43        self._initrd = initrd # Path to stress initrd
44        self._transport = transport # 'unix' or 'tcp' or 'rdma'
45        self._sleep = sleep
46        self._verbose = verbose
47        self._debug = debug
48
49        if debug:
50            self._verbose = debug
51
52    def _vcpu_timing(self, pid, tid_list):
53        records = []
54        now = time.time()
55
56        jiffies_per_sec = os.sysconf(os.sysconf_names['SC_CLK_TCK'])
57        for tid in tid_list:
58            statfile = "/proc/%d/task/%d/stat" % (pid, tid)
59            with open(statfile, "r") as fh:
60                stat = fh.readline()
61                fields = stat.split(" ")
62                stime = int(fields[13])
63                utime = int(fields[14])
64                records.append(TimingRecord(tid, now, 1000 * (stime + utime) / jiffies_per_sec))
65        return records
66
67    def _cpu_timing(self, pid):
68        records = []
69        now = time.time()
70
71        jiffies_per_sec = os.sysconf(os.sysconf_names['SC_CLK_TCK'])
72        statfile = "/proc/%d/stat" % pid
73        with open(statfile, "r") as fh:
74            stat = fh.readline()
75            fields = stat.split(" ")
76            stime = int(fields[13])
77            utime = int(fields[14])
78            return TimingRecord(pid, now, 1000 * (stime + utime) / jiffies_per_sec)
79
80    def _migrate_progress(self, vm):
81        info = vm.command("query-migrate")
82
83        if "ram" not in info:
84            info["ram"] = {}
85
86        return Progress(
87            info.get("status", "active"),
88            ProgressStats(
89                info["ram"].get("transferred", 0),
90                info["ram"].get("remaining", 0),
91                info["ram"].get("total", 0),
92                info["ram"].get("duplicate", 0),
93                info["ram"].get("skipped", 0),
94                info["ram"].get("normal", 0),
95                info["ram"].get("normal-bytes", 0),
96                info["ram"].get("dirty-pages-rate", 0),
97                info["ram"].get("mbps", 0),
98                info["ram"].get("dirty-sync-count", 0)
99            ),
100            time.time(),
101            info.get("total-time", 0),
102            info.get("downtime", 0),
103            info.get("expected-downtime", 0),
104            info.get("setup-time", 0),
105            info.get("cpu-throttle-percentage", 0),
106        )
107
108    def _migrate(self, hardware, scenario, src, dst, connect_uri):
109        src_qemu_time = []
110        src_vcpu_time = []
111        src_pid = src.get_pid()
112
113        vcpus = src.command("query-cpus-fast")
114        src_threads = []
115        for vcpu in vcpus:
116            src_threads.append(vcpu["thread_id"])
117
118        # XXX how to get dst timings on remote host ?
119
120        if self._verbose:
121            print("Sleeping %d seconds for initial guest workload run" % self._sleep)
122        sleep_secs = self._sleep
123        while sleep_secs > 1:
124            src_qemu_time.append(self._cpu_timing(src_pid))
125            src_vcpu_time.extend(self._vcpu_timing(src_pid, src_threads))
126            time.sleep(1)
127            sleep_secs -= 1
128
129        if self._verbose:
130            print("Starting migration")
131        if scenario._auto_converge:
132            resp = src.command("migrate-set-capabilities",
133                               capabilities = [
134                                   { "capability": "auto-converge",
135                                     "state": True }
136                               ])
137            resp = src.command("migrate-set-parameters",
138                               cpu_throttle_increment=scenario._auto_converge_step)
139
140        if scenario._post_copy:
141            resp = src.command("migrate-set-capabilities",
142                               capabilities = [
143                                   { "capability": "postcopy-ram",
144                                     "state": True }
145                               ])
146            resp = dst.command("migrate-set-capabilities",
147                               capabilities = [
148                                   { "capability": "postcopy-ram",
149                                     "state": True }
150                               ])
151
152        resp = src.command("migrate-set-parameters",
153                           max_bandwidth=scenario._bandwidth * 1024 * 1024)
154
155        resp = src.command("migrate-set-parameters",
156                           downtime_limit=scenario._downtime / 1024.0)
157
158        if scenario._compression_mt:
159            resp = src.command("migrate-set-capabilities",
160                               capabilities = [
161                                   { "capability": "compress",
162                                     "state": True }
163                               ])
164            resp = src.command("migrate-set-parameters",
165                               compress_threads=scenario._compression_mt_threads)
166            resp = dst.command("migrate-set-capabilities",
167                               capabilities = [
168                                   { "capability": "compress",
169                                     "state": True }
170                               ])
171            resp = dst.command("migrate-set-parameters",
172                               decompress_threads=scenario._compression_mt_threads)
173
174        if scenario._compression_xbzrle:
175            resp = src.command("migrate-set-capabilities",
176                               capabilities = [
177                                   { "capability": "xbzrle",
178                                     "state": True }
179                               ])
180            resp = dst.command("migrate-set-capabilities",
181                               capabilities = [
182                                   { "capability": "xbzrle",
183                                     "state": True }
184                               ])
185            resp = src.command("migrate-set-parameters",
186                               xbzrle_cache_size=(
187                                   hardware._mem *
188                                   1024 * 1024 * 1024 / 100 *
189                                   scenario._compression_xbzrle_cache))
190
191        if scenario._multifd:
192            resp = src.command("migrate-set-capabilities",
193                               capabilities = [
194                                   { "capability": "multifd",
195                                     "state": True }
196                               ])
197            resp = src.command("migrate-set-parameters",
198                               multifd_channels=scenario._multifd_channels)
199            resp = dst.command("migrate-set-capabilities",
200                               capabilities = [
201                                   { "capability": "multifd",
202                                     "state": True }
203                               ])
204            resp = dst.command("migrate-set-parameters",
205                               multifd_channels=scenario._multifd_channels)
206
207        resp = src.command("migrate", uri=connect_uri)
208
209        post_copy = False
210        paused = False
211
212        progress_history = []
213
214        start = time.time()
215        loop = 0
216        while True:
217            loop = loop + 1
218            time.sleep(0.05)
219
220            progress = self._migrate_progress(src)
221            if (loop % 20) == 0:
222                src_qemu_time.append(self._cpu_timing(src_pid))
223                src_vcpu_time.extend(self._vcpu_timing(src_pid, src_threads))
224
225            if (len(progress_history) == 0 or
226                (progress_history[-1]._ram._iterations <
227                 progress._ram._iterations)):
228                progress_history.append(progress)
229
230            if progress._status in ("completed", "failed", "cancelled"):
231                if progress._status == "completed" and paused:
232                    dst.command("cont")
233                if progress_history[-1] != progress:
234                    progress_history.append(progress)
235
236                if progress._status == "completed":
237                    if self._verbose:
238                        print("Sleeping %d seconds for final guest workload run" % self._sleep)
239                    sleep_secs = self._sleep
240                    while sleep_secs > 1:
241                        time.sleep(1)
242                        src_qemu_time.append(self._cpu_timing(src_pid))
243                        src_vcpu_time.extend(self._vcpu_timing(src_pid, src_threads))
244                        sleep_secs -= 1
245
246                return [progress_history, src_qemu_time, src_vcpu_time]
247
248            if self._verbose and (loop % 20) == 0:
249                print("Iter %d: remain %5dMB of %5dMB (total %5dMB @ %5dMb/sec)" % (
250                    progress._ram._iterations,
251                    progress._ram._remaining_bytes / (1024 * 1024),
252                    progress._ram._total_bytes / (1024 * 1024),
253                    progress._ram._transferred_bytes / (1024 * 1024),
254                    progress._ram._transfer_rate_mbs,
255                ))
256
257            if progress._ram._iterations > scenario._max_iters:
258                if self._verbose:
259                    print("No completion after %d iterations over RAM" % scenario._max_iters)
260                src.command("migrate_cancel")
261                continue
262
263            if time.time() > (start + scenario._max_time):
264                if self._verbose:
265                    print("No completion after %d seconds" % scenario._max_time)
266                src.command("migrate_cancel")
267                continue
268
269            if (scenario._post_copy and
270                progress._ram._iterations >= scenario._post_copy_iters and
271                not post_copy):
272                if self._verbose:
273                    print("Switching to post-copy after %d iterations" % scenario._post_copy_iters)
274                resp = src.command("migrate-start-postcopy")
275                post_copy = True
276
277            if (scenario._pause and
278                progress._ram._iterations >= scenario._pause_iters and
279                not paused):
280                if self._verbose:
281                    print("Pausing VM after %d iterations" % scenario._pause_iters)
282                resp = src.command("stop")
283                paused = True
284
285    def _get_common_args(self, hardware, tunnelled=False):
286        args = [
287            "noapic",
288            "edd=off",
289            "printk.time=1",
290            "noreplace-smp",
291            "cgroup_disable=memory",
292            "pci=noearly",
293            "console=ttyS0",
294        ]
295        if self._debug:
296            args.append("debug")
297        else:
298            args.append("quiet")
299
300        args.append("ramsize=%s" % hardware._mem)
301
302        cmdline = " ".join(args)
303        if tunnelled:
304            cmdline = "'" + cmdline + "'"
305
306        argv = [
307            "-accel", "kvm",
308            "-cpu", "host",
309            "-kernel", self._kernel,
310            "-initrd", self._initrd,
311            "-append", cmdline,
312            "-chardev", "stdio,id=cdev0",
313            "-device", "isa-serial,chardev=cdev0",
314            "-m", str((hardware._mem * 1024) + 512),
315            "-smp", str(hardware._cpus),
316        ]
317
318        if self._debug:
319            argv.extend(["-device", "sga"])
320
321        if hardware._prealloc_pages:
322            argv_source += ["-mem-path", "/dev/shm",
323                            "-mem-prealloc"]
324        if hardware._locked_pages:
325            argv_source += ["-overcommit", "mem-lock=on"]
326        if hardware._huge_pages:
327            pass
328
329        return argv
330
331    def _get_src_args(self, hardware):
332        return self._get_common_args(hardware)
333
334    def _get_dst_args(self, hardware, uri):
335        tunnelled = False
336        if self._dst_host != "localhost":
337            tunnelled = True
338        argv = self._get_common_args(hardware, tunnelled)
339        return argv + ["-incoming", uri]
340
341    @staticmethod
342    def _get_common_wrapper(cpu_bind, mem_bind):
343        wrapper = []
344        if len(cpu_bind) > 0 or len(mem_bind) > 0:
345            wrapper.append("numactl")
346            if cpu_bind:
347                wrapper.append("--physcpubind=%s" % ",".join(cpu_bind))
348            if mem_bind:
349                wrapper.append("--membind=%s" % ",".join(mem_bind))
350
351        return wrapper
352
353    def _get_src_wrapper(self, hardware):
354        return self._get_common_wrapper(hardware._src_cpu_bind, hardware._src_mem_bind)
355
356    def _get_dst_wrapper(self, hardware):
357        wrapper = self._get_common_wrapper(hardware._dst_cpu_bind, hardware._dst_mem_bind)
358        if self._dst_host != "localhost":
359            return ["ssh",
360                    "-R", "9001:localhost:9001",
361                    self._dst_host] + wrapper
362        else:
363            return wrapper
364
365    def _get_timings(self, vm):
366        log = vm.get_log()
367        if not log:
368            return []
369        if self._debug:
370            print(log)
371
372        regex = r"[^\s]+\s\((\d+)\):\sINFO:\s(\d+)ms\scopied\s\d+\sGB\sin\s(\d+)ms"
373        matcher = re.compile(regex)
374        records = []
375        for line in log.split("\n"):
376            match = matcher.match(line)
377            if match:
378                records.append(TimingRecord(int(match.group(1)),
379                                            int(match.group(2)) / 1000.0,
380                                            int(match.group(3))))
381        return records
382
383    def run(self, hardware, scenario, result_dir=os.getcwd()):
384        abs_result_dir = os.path.join(result_dir, scenario._name)
385
386        if self._transport == "tcp":
387            uri = "tcp:%s:9000" % self._dst_host
388        elif self._transport == "rdma":
389            uri = "rdma:%s:9000" % self._dst_host
390        elif self._transport == "unix":
391            if self._dst_host != "localhost":
392                raise Exception("Running use unix migration transport for non-local host")
393            uri = "unix:/var/tmp/qemu-migrate-%d.migrate" % os.getpid()
394            try:
395                os.remove(uri[5:])
396                os.remove(monaddr)
397            except:
398                pass
399
400        if self._dst_host != "localhost":
401            dstmonaddr = ("localhost", 9001)
402        else:
403            dstmonaddr = "/var/tmp/qemu-dst-%d-monitor.sock" % os.getpid()
404        srcmonaddr = "/var/tmp/qemu-src-%d-monitor.sock" % os.getpid()
405
406        src = QEMUMachine(self._binary,
407                          args=self._get_src_args(hardware),
408                          wrapper=self._get_src_wrapper(hardware),
409                          name="qemu-src-%d" % os.getpid(),
410                          monitor_address=srcmonaddr)
411
412        dst = QEMUMachine(self._binary,
413                          args=self._get_dst_args(hardware, uri),
414                          wrapper=self._get_dst_wrapper(hardware),
415                          name="qemu-dst-%d" % os.getpid(),
416                          monitor_address=dstmonaddr)
417
418        try:
419            src.launch()
420            dst.launch()
421
422            ret = self._migrate(hardware, scenario, src, dst, uri)
423            progress_history = ret[0]
424            qemu_timings = ret[1]
425            vcpu_timings = ret[2]
426            if uri[0:5] == "unix:":
427                os.remove(uri[5:])
428
429            if os.path.exists(srcmonaddr):
430                os.remove(srcmonaddr)
431
432            if self._dst_host == "localhost" and os.path.exists(dstmonaddr):
433                os.remove(dstmonaddr)
434
435            if self._verbose:
436                print("Finished migration")
437
438            src.shutdown()
439            dst.shutdown()
440
441            return Report(hardware, scenario, progress_history,
442                          Timings(self._get_timings(src) + self._get_timings(dst)),
443                          Timings(qemu_timings),
444                          Timings(vcpu_timings),
445                          self._binary, self._dst_host, self._kernel,
446                          self._initrd, self._transport, self._sleep)
447        except Exception as e:
448            if self._debug:
449                print("Failed: %s" % str(e))
450            try:
451                src.shutdown()
452            except:
453                pass
454            try:
455                dst.shutdown()
456            except:
457                pass
458
459            if self._debug:
460                print(src.get_log())
461                print(dst.get_log())
462            raise
463
464