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qemu/tests/qemu-iotests/122.out
Peter Lieven 8dcd3c9b91 qemu-img: align result of is_allocated_sectors 
We currently don't enforce that the sparse segments we detect during convert are
aligned. This leads to unnecessary and costly read-modify-write cycles either
internally in Qemu or in the background on the storage device as nearly all
modern filesystems or hardware have a 4k alignment internally.

This patch modifies is_allocated_sectors so that its *pnum result will always
end at an alignment boundary. This way all requests will end at an alignment
boundary. The start of all requests will also be aligned as long as the results
of get_block_status do not lead to an unaligned offset.

The number of RMW cycles when converting an example image [1] to a raw device that
has 4k sector size is about 4600 4k read requests to perform a total of about 15000
write requests. With this path the additional 4600 read requests are eliminated while
the number of total write requests stays constant.

[1] https://cloud-images.ubuntu.com/releases/16.04/release/ubuntu-16.04-server-cloudimg-amd64-disk1.vmdk

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2018-07-12 18:24:08 +02:00

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QA output created by 122
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
wrote 67108864/67108864 bytes at offset 0
64 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Check allocation status regression with -B ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base
wrote 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Offset Length File
0 0x300000 TEST_DIR/t.IMGFMT.orig
0x300000 0x3d00000 TEST_DIR/t.IMGFMT.base
=== Check that zero clusters are kept in overlay ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base
wrote 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Converting to an overlay larger than its backing file ===
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=268435456
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=805306368 backing_file=TEST_DIR/t.IMGFMT.base
Offset Length File
wrote 1048576/1048576 bytes at offset 267386880
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1048576/1048576 bytes at offset 629145600
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Offset Length File
0xff00000 0x100000 TEST_DIR/t.IMGFMT.base
0x25800000 0x100000 TEST_DIR/t.IMGFMT.orig
read 1048576/1048576 bytes at offset 267386880
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1048576/1048576 bytes at offset 629145600
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Concatenate multiple source images ===
Formatting 'TEST_DIR/t.IMGFMT.1', fmt=IMGFMT size=4194304
Formatting 'TEST_DIR/t.IMGFMT.2', fmt=IMGFMT size=4194304
Formatting 'TEST_DIR/t.IMGFMT.3', fmt=IMGFMT size=4194304
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Offset Length File
0 0x10000 TEST_DIR/t.IMGFMT
0x400000 0x10000 TEST_DIR/t.IMGFMT
0x800000 0x10000 TEST_DIR/t.IMGFMT
read 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 4194304
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 8388608
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 65536, "depth": 0, "zero": false, "data": true},
{ "start": 65536, "length": 4128768, "depth": 0, "zero": true, "data": false},
{ "start": 4194304, "length": 65536, "depth": 0, "zero": false, "data": true},
{ "start": 4259840, "length": 4128768, "depth": 0, "zero": true, "data": false},
{ "start": 8388608, "length": 65536, "depth": 0, "zero": false, "data": true},
{ "start": 8454144, "length": 4128768, "depth": 0, "zero": true, "data": false}]
read 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 4194304
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 65536/65536 bytes at offset 8388608
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
qemu-img: Having a backing file for the target makes no sense when concatenating multiple input images
qemu-img: Having a backing file for the target makes no sense when concatenating multiple input images
=== Compression with misaligned allocations and image sizes ===
Formatting 'TEST_DIR/t.IMGFMT.1', fmt=IMGFMT size=1047552
Formatting 'TEST_DIR/t.IMGFMT.2', fmt=IMGFMT size=1047552
wrote 16384/16384 bytes at offset 16384
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 133120/133120 bytes at offset 133120
130 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 1046528
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 0
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 65536, "depth": 0, "zero": false, "data": true},
{ "start": 65536, "length": 65536, "depth": 0, "zero": true, "data": false},
{ "start": 131072, "length": 196608, "depth": 0, "zero": false, "data": true},
{ "start": 327680, "length": 655360, "depth": 0, "zero": true, "data": false},
{ "start": 983040, "length": 65536, "depth": 0, "zero": false, "data": true},
{ "start": 1048576, "length": 1046528, "depth": 0, "zero": true, "data": false}]
read 16384/16384 bytes at offset 0
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 16384/16384 bytes at offset 16384
16 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 100352/100352 bytes at offset 32768
98 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 133120/133120 bytes at offset 133120
130 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 780288/780288 bytes at offset 266240
762 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1024/1024 bytes at offset 1046528
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1024/1024 bytes at offset 1047552
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 1046528/1046528 bytes at offset 1048576
1022 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
=== Full allocation with -S 0 ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
wrote 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 3145728/3145728 bytes at offset 3145728
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
convert -S 0:
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 63963136/63963136 bytes at offset 3145728
61 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "zero": false, "data": true, "offset": OFFSET}]
convert -c -S 0:
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 63963136/63963136 bytes at offset 3145728
61 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "zero": false, "data": true}]
Formatting 'TEST_DIR/t.IMGFMT.base', fmt=IMGFMT size=67108864
wrote 33554432/33554432 bytes at offset 0
32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 backing_file=TEST_DIR/t.IMGFMT.base
wrote 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
convert -S 0 with source backing file:
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 30408704/30408704 bytes at offset 3145728
29 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 33554432/33554432 bytes at offset 33554432
32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "zero": false, "data": true, "offset": OFFSET}]
convert -c -S 0 with source backing file:
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 30408704/30408704 bytes at offset 3145728
29 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 33554432/33554432 bytes at offset 33554432
32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "zero": false, "data": true}]
convert -S 0 -B ...
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 30408704/30408704 bytes at offset 3145728
29 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 33554432/33554432 bytes at offset 33554432
32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "zero": false, "data": true, "offset": OFFSET}]
convert -c -S 0 -B ...
read 3145728/3145728 bytes at offset 0
3 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 30408704/30408704 bytes at offset 3145728
29 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 33554432/33554432 bytes at offset 33554432
32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
[{ "start": 0, "length": 67108864, "depth": 0, "zero": false, "data": true}]
=== Non-zero -S ===
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
wrote 65536/65536 bytes at offset 0
64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 0
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 8192
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote 1024/1024 bytes at offset 17408
1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
convert -S 4k
[{ "start": 0, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
{ "start": 4096, "length": 4096, "depth": 0, "zero": true, "data": false},
{ "start": 8192, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
{ "start": 12288, "length": 4096, "depth": 0, "zero": true, "data": false},
{ "start": 16384, "length": 4096, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
{ "start": 20480, "length": 67088384, "depth": 0, "zero": true, "data": false}]
convert -c -S 4k
[{ "start": 0, "length": 1024, "depth": 0, "zero": false, "data": true},
{ "start": 1024, "length": 7168, "depth": 0, "zero": true, "data": false},
{ "start": 8192, "length": 1024, "depth": 0, "zero": false, "data": true},
{ "start": 9216, "length": 8192, "depth": 0, "zero": true, "data": false},
{ "start": 17408, "length": 1024, "depth": 0, "zero": false, "data": true},
{ "start": 18432, "length": 67090432, "depth": 0, "zero": true, "data": false}]
convert -S 8k
[{ "start": 0, "length": 24576, "depth": 0, "zero": false, "data": true, "offset": OFFSET},
{ "start": 24576, "length": 67084288, "depth": 0, "zero": true, "data": false}]
convert -c -S 8k
[{ "start": 0, "length": 1024, "depth": 0, "zero": false, "data": true},
{ "start": 1024, "length": 7168, "depth": 0, "zero": true, "data": false},
{ "start": 8192, "length": 1024, "depth": 0, "zero": false, "data": true},
{ "start": 9216, "length": 8192, "depth": 0, "zero": true, "data": false},
{ "start": 17408, "length": 1024, "depth": 0, "zero": false, "data": true},
{ "start": 18432, "length": 67090432, "depth": 0, "zero": true, "data": false}]
*** done
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