#!/usr/bin/env python # # Tests for block device statistics # # Copyright (C) 2015 Igalia, S.L. # Author: Alberto Garcia # # 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 . # import iotests import os interval_length = 10 nsec_per_sec = 1000000000 op_latency = nsec_per_sec / 1000 # See qtest_latency_ns in accounting.c bad_sector = 8192 bad_offset = bad_sector * 512 blkdebug_file = os.path.join(iotests.test_dir, 'blkdebug.conf') class BlockDeviceStatsTestCase(iotests.QMPTestCase): test_img = "null-aio://" total_rd_bytes = 0 total_rd_ops = 0 total_wr_bytes = 0 total_wr_ops = 0 total_wr_merged = 0 total_flush_ops = 0 failed_rd_ops = 0 failed_wr_ops = 0 invalid_rd_ops = 0 invalid_wr_ops = 0 wr_highest_offset = 0 account_invalid = False account_failed = False def blockstats(self, device): result = self.vm.qmp("query-blockstats") for r in result['return']: if r['device'] == device: return r['stats'] raise Exception("Device not found for blockstats: %s" % device) def create_blkdebug_file(self): file = open(blkdebug_file, 'w') file.write(''' [inject-error] event = "read_aio" errno = "5" sector = "%d" [inject-error] event = "write_aio" errno = "5" sector = "%d" ''' % (bad_sector, bad_sector)) file.close() def setUp(self): drive_args = [] drive_args.append("stats-intervals.0=%d" % interval_length) drive_args.append("stats-account-invalid=%s" % (self.account_invalid and "on" or "off")) drive_args.append("stats-account-failed=%s" % (self.account_failed and "on" or "off")) self.create_blkdebug_file() self.vm = iotests.VM().add_drive('blkdebug:%s:%s' % (blkdebug_file, self.test_img), ','.join(drive_args)) self.vm.launch() # Set an initial value for the clock self.vm.qtest("clock_step %d" % nsec_per_sec) def tearDown(self): self.vm.shutdown() os.remove(blkdebug_file) def accounted_ops(self, read = False, write = False, flush = False): ops = 0 if write: ops += self.total_wr_ops if self.account_failed: ops += self.failed_wr_ops if self.account_invalid: ops += self.invalid_wr_ops if read: ops += self.total_rd_ops if self.account_failed: ops += self.failed_rd_ops if self.account_invalid: ops += self.invalid_rd_ops if flush: ops += self.total_flush_ops return ops def accounted_latency(self, read = False, write = False, flush = False): latency = 0 if write: latency += self.total_wr_ops * op_latency if self.account_failed: latency += self.failed_wr_ops * op_latency if read: latency += self.total_rd_ops * op_latency if self.account_failed: latency += self.failed_rd_ops * op_latency if flush: latency += self.total_flush_ops * op_latency return latency def check_values(self): stats = self.blockstats('drive0') # Check that the totals match with what we have calculated self.assertEqual(self.total_rd_bytes, stats['rd_bytes']) self.assertEqual(self.total_wr_bytes, stats['wr_bytes']) self.assertEqual(self.total_rd_ops, stats['rd_operations']) self.assertEqual(self.total_wr_ops, stats['wr_operations']) self.assertEqual(self.total_flush_ops, stats['flush_operations']) self.assertEqual(self.wr_highest_offset, stats['wr_highest_offset']) self.assertEqual(self.failed_rd_ops, stats['failed_rd_operations']) self.assertEqual(self.failed_wr_ops, stats['failed_wr_operations']) self.assertEqual(self.invalid_rd_ops, stats['invalid_rd_operations']) self.assertEqual(self.invalid_wr_ops, stats['invalid_wr_operations']) self.assertEqual(self.account_invalid, stats['account_invalid']) self.assertEqual(self.account_failed, stats['account_failed']) self.assertEqual(self.total_wr_merged, stats['wr_merged']) # Check that there's exactly one interval with the length we defined self.assertEqual(1, len(stats['timed_stats'])) timed_stats = stats['timed_stats'][0] self.assertEqual(interval_length, timed_stats['interval_length']) total_rd_latency = self.accounted_latency(read = True) if (total_rd_latency != 0): self.assertEqual(total_rd_latency, stats['rd_total_time_ns']) self.assertEqual(op_latency, timed_stats['min_rd_latency_ns']) self.assertEqual(op_latency, timed_stats['max_rd_latency_ns']) self.assertEqual(op_latency, timed_stats['avg_rd_latency_ns']) self.assertLess(0, timed_stats['avg_rd_queue_depth']) else: self.assertEqual(0, stats['rd_total_time_ns']) self.assertEqual(0, timed_stats['min_rd_latency_ns']) self.assertEqual(0, timed_stats['max_rd_latency_ns']) self.assertEqual(0, timed_stats['avg_rd_latency_ns']) self.assertEqual(0, timed_stats['avg_rd_queue_depth']) # min read latency <= avg read latency <= max read latency self.assertLessEqual(timed_stats['min_rd_latency_ns'], timed_stats['avg_rd_latency_ns']) self.assertLessEqual(timed_stats['avg_rd_latency_ns'], timed_stats['max_rd_latency_ns']) total_wr_latency = self.accounted_latency(write = True) if (total_wr_latency != 0): self.assertEqual(total_wr_latency, stats['wr_total_time_ns']) self.assertEqual(op_latency, timed_stats['min_wr_latency_ns']) self.assertEqual(op_latency, timed_stats['max_wr_latency_ns']) self.assertEqual(op_latency, timed_stats['avg_wr_latency_ns']) self.assertLess(0, timed_stats['avg_wr_queue_depth']) else: self.assertEqual(0, stats['wr_total_time_ns']) self.assertEqual(0, timed_stats['min_wr_latency_ns']) self.assertEqual(0, timed_stats['max_wr_latency_ns']) self.assertEqual(0, timed_stats['avg_wr_latency_ns']) self.assertEqual(0, timed_stats['avg_wr_queue_depth']) # min write latency <= avg write latency <= max write latency self.assertLessEqual(timed_stats['min_wr_latency_ns'], timed_stats['avg_wr_latency_ns']) self.assertLessEqual(timed_stats['avg_wr_latency_ns'], timed_stats['max_wr_latency_ns']) total_flush_latency = self.accounted_latency(flush = True) if (total_flush_latency != 0): self.assertEqual(total_flush_latency, stats['flush_total_time_ns']) self.assertEqual(op_latency, timed_stats['min_flush_latency_ns']) self.assertEqual(op_latency, timed_stats['max_flush_latency_ns']) self.assertEqual(op_latency, timed_stats['avg_flush_latency_ns']) else: self.assertEqual(0, stats['flush_total_time_ns']) self.assertEqual(0, timed_stats['min_flush_latency_ns']) self.assertEqual(0, timed_stats['max_flush_latency_ns']) self.assertEqual(0, timed_stats['avg_flush_latency_ns']) # min flush latency <= avg flush latency <= max flush latency self.assertLessEqual(timed_stats['min_flush_latency_ns'], timed_stats['avg_flush_latency_ns']) self.assertLessEqual(timed_stats['avg_flush_latency_ns'], timed_stats['max_flush_latency_ns']) # idle_time_ns must be > 0 if we have performed any operation if (self.accounted_ops(read = True, write = True, flush = True) != 0): self.assertLess(0, stats['idle_time_ns']) else: self.assertFalse(stats.has_key('idle_time_ns')) # This test does not alter these, so they must be all 0 self.assertEqual(0, stats['rd_merged']) self.assertEqual(0, stats['failed_flush_operations']) self.assertEqual(0, stats['invalid_flush_operations']) def do_test_stats(self, rd_size = 0, rd_ops = 0, wr_size = 0, wr_ops = 0, flush_ops = 0, invalid_rd_ops = 0, invalid_wr_ops = 0, failed_rd_ops = 0, failed_wr_ops = 0, wr_merged = 0): # The 'ops' list will contain all the requested I/O operations ops = [] for i in range(rd_ops): ops.append("aio_read %d %d" % (i * rd_size, rd_size)) for i in range(wr_ops): ops.append("aio_write %d %d" % (i * wr_size, wr_size)) for i in range(flush_ops): ops.append("aio_flush") highest_offset = wr_ops * wr_size for i in range(invalid_rd_ops): ops.append("aio_read -i 0 512") for i in range(invalid_wr_ops): ops.append("aio_write -i 0 512") for i in range(failed_rd_ops): ops.append("aio_read %d 512" % bad_offset) for i in range(failed_wr_ops): ops.append("aio_write %d 512" % bad_offset) # We need an extra aio_flush to settle all outstanding AIO # operations before we can advance the virtual clock, so that # the last access happens before clock_step and idle_time_ns # will be greater than 0 extra_flush = 0 if rd_ops + wr_ops + invalid_rd_ops + invalid_wr_ops + \ failed_rd_ops + failed_wr_ops > 0: extra_flush = 1 if extra_flush > 0: ops.append("aio_flush") if failed_wr_ops > 0: highest_offset = max(highest_offset, bad_offset + 512) # Now perform all operations for op in ops: self.vm.hmp_qemu_io("drive0", op) # Update the expected totals self.total_rd_bytes += rd_ops * rd_size self.total_rd_ops += rd_ops self.total_wr_bytes += wr_ops * wr_size self.total_wr_ops += wr_ops self.total_wr_merged += wr_merged self.total_flush_ops += flush_ops + extra_flush self.invalid_rd_ops += invalid_rd_ops self.invalid_wr_ops += invalid_wr_ops self.failed_rd_ops += failed_rd_ops self.failed_wr_ops += failed_wr_ops self.wr_highest_offset = max(self.wr_highest_offset, highest_offset) # Advance the clock so idle_time_ns has a meaningful value self.vm.qtest("clock_step %d" % nsec_per_sec) # And check that the actual statistics match the expected ones self.check_values() def test_read_only(self): test_values = [[512, 1], [65536, 1], [512, 12], [65536, 12]] for i in test_values: self.do_test_stats(rd_size = i[0], rd_ops = i[1]) def test_write_only(self): test_values = [[512, 1], [65536, 1], [512, 12], [65536, 12]] for i in test_values: self.do_test_stats(wr_size = i[0], wr_ops = i[1]) def test_invalid(self): self.do_test_stats(invalid_rd_ops = 7) self.do_test_stats(invalid_wr_ops = 3) self.do_test_stats(invalid_rd_ops = 4, invalid_wr_ops = 5) def test_failed(self): self.do_test_stats(failed_rd_ops = 8) self.do_test_stats(failed_wr_ops = 6) self.do_test_stats(failed_rd_ops = 5, failed_wr_ops = 12) def test_flush(self): self.do_test_stats(flush_ops = 8) def test_all(self): # rd_size, rd_ops, wr_size, wr_ops, flush_ops # invalid_rd_ops, invalid_wr_ops, # failed_rd_ops, failed_wr_ops # wr_merged test_values = [[512, 1, 512, 1, 1, 4, 7, 5, 2, 0], [65536, 1, 2048, 12, 7, 7, 5, 2, 5, 0], [32768, 9, 8192, 1, 4, 3, 2, 4, 6, 0], [16384, 11, 3584, 16, 9, 8, 6, 7, 3, 0]] for i in test_values: self.do_test_stats(*i) def test_no_op(self): # All values must be sane before doing any I/O self.check_values() class BlockDeviceStatsTestAccountInvalid(BlockDeviceStatsTestCase): account_invalid = True account_failed = False class BlockDeviceStatsTestAccountFailed(BlockDeviceStatsTestCase): account_invalid = False account_failed = True class BlockDeviceStatsTestAccountBoth(BlockDeviceStatsTestCase): account_invalid = True account_failed = True class BlockDeviceStatsTestCoroutine(BlockDeviceStatsTestCase): test_img = "null-co://" if __name__ == '__main__': iotests.main(supported_fmts=["raw"])