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qemu-iotests: Update 093 to improve the draining test

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The previous patch fixes a problem in which draining a block device
with more than one throttled request can make it wait first for the
completion of requests in other members of the same group.

This patch updates test_remove_group_member() in iotest 093 to
reproduce that scenario. This updated test would hang QEMU without the
fix from the previous patch.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2018-08-02 17:50:25 +03:00 committed by Kevin Wolf
parent 5d8e4ca035
commit 3db3e9c621
1 changed files with 11 additions and 8 deletions
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19
tests/qemu-iotests/093
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@ -225,15 +225,18 @@ class ThrottleTestCase(iotests.QMPTestCase):
# Read 4KB from drive0. This is performed immediately.
self.vm.hmp_qemu_io("drive0", "aio_read 0 4096")
# Read 4KB again. The I/O limit has been exceeded so this
# Read 2KB. The I/O limit has been exceeded so this
# request is throttled and a timer is set to wake it up.
self.vm.hmp_qemu_io("drive0", "aio_read 0 4096")
self.vm.hmp_qemu_io("drive0", "aio_read 0 2048")
# Read from drive1. We're still over the I/O limit so this
# request is also throttled. There's no timer set in drive1
# because there's already one in drive0. Once the timer in
# drive0 fires and its throttled request is processed then the
# next request in the queue will be scheduled: this one.
# Read 2KB again. We're still over the I/O limit so this is
# request is also throttled, but no new timer is set since
# there's already one.
self.vm.hmp_qemu_io("drive0", "aio_read 0 2048")
# Read from drive1. This request is also throttled, and no
# timer is set in drive1 because there's already one in
# drive0.
self.vm.hmp_qemu_io("drive1", "aio_read 0 4096")
# At this point only the first 4KB have been read from drive0.
@ -248,7 +251,7 @@ class ThrottleTestCase(iotests.QMPTestCase):
result = self.vm.qmp("block_set_io_throttle", conv_keys=False, **params)
self.assert_qmp(result, 'return', {})
# Removing the I/O limits from drive0 drains its pending request.
# Removing the I/O limits from drive0 drains its two pending requests.
# The read request in drive1 is still throttled.
self.assertEqual(self.blockstats('drive0')[0], 8192)
self.assertEqual(self.blockstats('drive1')[0], 0)