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