From edb90bbdf33f6e96788b454fae9abfed18274692 Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Mon, 27 Jul 2020 22:42:19 +0300 Subject: [PATCH] qemu-iotests/199: improve performance: set bitmap by discard Discard dirties dirty-bitmap as well as write, but works faster. Let's use it instead. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Andrey Shinkevich Tested-by: Eric Blake Message-Id: <20200727194236.19551-5-vsementsov@virtuozzo.com> Signed-off-by: Eric Blake --- tests/qemu-iotests/199 | 31 ++++++++++++++++++++----------- 1 file changed, 20 insertions(+), 11 deletions(-) diff --git a/tests/qemu-iotests/199 b/tests/qemu-iotests/199 index dd6044768c..190e820b84 100755 --- a/tests/qemu-iotests/199 +++ b/tests/qemu-iotests/199 @@ -67,8 +67,10 @@ class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase): os.mkfifo(fifo) qemu_img('create', '-f', iotests.imgfmt, disk_a, size) qemu_img('create', '-f', iotests.imgfmt, disk_b, size) - self.vm_a = iotests.VM(path_suffix='a').add_drive(disk_a) - self.vm_b = iotests.VM(path_suffix='b').add_drive(disk_b) + self.vm_a = iotests.VM(path_suffix='a').add_drive(disk_a, + 'discard=unmap') + self.vm_b = iotests.VM(path_suffix='b').add_drive(disk_b, + 'discard=unmap') self.vm_b.add_incoming("exec: cat '" + fifo + "'") self.vm_a.launch() self.vm_b.launch() @@ -78,7 +80,7 @@ class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase): self.vm_b_events = [] def test_postcopy(self): - write_size = 0x40000000 + discard_size = 0x40000000 granularity = 512 chunk = 4096 @@ -86,25 +88,32 @@ class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase): name='bitmap', granularity=granularity) self.assert_qmp(result, 'return', {}) + result = self.vm_a.qmp('x-debug-block-dirty-bitmap-sha256', + node='drive0', name='bitmap') + empty_sha256 = result['return']['sha256'] + s = 0 - while s < write_size: - self.vm_a.hmp_qemu_io('drive0', 'write %d %d' % (s, chunk)) + while s < discard_size: + self.vm_a.hmp_qemu_io('drive0', 'discard %d %d' % (s, chunk)) s += 0x10000 s = 0x8000 - while s < write_size: - self.vm_a.hmp_qemu_io('drive0', 'write %d %d' % (s, chunk)) + while s < discard_size: + self.vm_a.hmp_qemu_io('drive0', 'discard %d %d' % (s, chunk)) s += 0x10000 result = self.vm_a.qmp('x-debug-block-dirty-bitmap-sha256', node='drive0', name='bitmap') sha256 = result['return']['sha256'] + # Check, that updating the bitmap by discards works + assert sha256 != empty_sha256 + result = self.vm_a.qmp('block-dirty-bitmap-clear', node='drive0', name='bitmap') self.assert_qmp(result, 'return', {}) s = 0 - while s < write_size: - self.vm_a.hmp_qemu_io('drive0', 'write %d %d' % (s, chunk)) + while s < discard_size: + self.vm_a.hmp_qemu_io('drive0', 'discard %d %d' % (s, chunk)) s += 0x10000 caps = [{'capability': 'dirty-bitmaps', 'state': True}, @@ -126,8 +135,8 @@ class TestDirtyBitmapPostcopyMigration(iotests.QMPTestCase): self.vm_b_events.append(event_resume) s = 0x8000 - while s < write_size: - self.vm_b.hmp_qemu_io('drive0', 'write %d %d' % (s, chunk)) + while s < discard_size: + self.vm_b.hmp_qemu_io('drive0', 'discard %d %d' % (s, chunk)) s += 0x10000 match = {'data': {'status': 'completed'}}