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block/io: optimize bdrv_co_pwritev for small requests

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in a read-modify-write cycle a small request might cause
head and tail to fall into the same aligned block. Currently
QEMU reads the same block twice in this case which is
not necessary.

Signed-off-by: Peter Lieven <pl@kamp.de>
Message-id: 1464607873-28206-1-git-send-email-pl@kamp.de
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Peter Lieven 2016-05-30 13:31:13 +02:00 • committed by Stefan Hajnoczi
parent e3a4f91b4d
commit 117bc3fa22
3 changed files with 9 additions and 37 deletions
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26
tests/qemu-iotests/077.out
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@ -19,16 +19,6 @@ wrote XXX/XXX bytes at offset XXX
XXX bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote XXX/XXX bytes at offset XXX
XXX bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
blkdebug: Resuming request 'A'
wrote XXX/XXX bytes at offset XXX
XXX bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote XXX/XXX bytes at offset XXX
XXX bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
blkdebug: Resuming request 'A'
wrote XXX/XXX bytes at offset XXX
XXX bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote XXX/XXX bytes at offset XXX
XXX bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote XXX/XXX bytes at offset XXX
XXX bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
wrote XXX/XXX bytes at offset XXX
@ -114,22 +104,6 @@ read 512/512 bytes at offset 9216
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 2560/2560 bytes at offset 9728
2.500 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 512/512 bytes at offset 12288
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 512/512 bytes at offset 12800
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 512/512 bytes at offset 13312
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 2560/2560 bytes at offset 13824
2.500 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 512/512 bytes at offset 16384
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 512/512 bytes at offset 16896
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 512/512 bytes at offset 17408
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 2560/2560 bytes at offset 17920
2.500 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 512/512 bytes at offset 20480
512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 512/512 bytes at offset 20992