iotests: Add test for the block device statistics

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 0fb8501bbf3666b3d5d3f67fa899729c88f21baf.1446044838.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 349 insertions, 0 deletions

diff --git a/tests/qemu-iotests/136 b/tests/qemu-iotests/136
new file mode 100644
index 0000000000..f574d83ff7
--- /dev/null
+++ b/tests/qemu-iotests/136
@@ -0,0 +1,349 @@
+#!/usr/bin/env python
+#
+# Tests for block device statistics
+#
+# Copyright (C) 2015 Igalia, S.L.
+# Author: Alberto Garcia <berto@igalia.com>
+#
+# 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 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=%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
+
+        # Two types of invalid operations: unaligned length and unaligned offset
+        for i in range(invalid_rd_ops / 2):
+            ops.append("aio_read 0 511")
+
+        for i in range(invalid_rd_ops / 2, invalid_rd_ops):
+            ops.append("aio_read 13 512")
+
+        for i in range(invalid_wr_ops / 2):
+            ops.append("aio_write 0 511")
+
+        for i in range(invalid_wr_ops / 2, invalid_wr_ops):
+            ops.append("aio_write 13 512")
+
+        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)
+
+        if failed_wr_ops > 0:
+            highest_offset = max(highest_offset, bad_offset + 512)
+
+        for i in range(wr_merged):
+            first = i * wr_size * 2
+            second = first + wr_size
+            ops.append("multiwrite %d %d ; %d %d" %
+                       (first, wr_size, second, wr_size))
+
+        highest_offset = max(highest_offset, wr_merged * wr_size * 2)
+
+        # 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
+        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_merged(self):
+        for i in range(5):
+            self.do_test_stats(wr_merged = i * 3)
+
+    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, 1],
+                       [65536,  1, 2048, 12, 7, 7, 5, 2, 5, 5],
+                       [32768,  9, 8192,  1, 4, 3, 2, 4, 6, 4],
+                       [16384, 11, 3584, 16, 9, 8, 6, 7, 3, 4]]
+        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"])