Hi!
It's a continuation for
"[PATCH] qcow2: avoid lseek on block_status if possible"
https://lists.gnu.org/archive/html/qemu-devel/2019-01/msg06598.html
performance results for block-status on tmpfs [tests originally by Kevin,
now they are in 01]:
./tests/perf/block/qcow2/convert-blockstatus /ramdisk/x
after 01:
plain: 81.77
forward: 82.61
prealloc: 0.01
after 02:
plain: 0.12
forward: 0.12
prealloc: 0.01
v2:
01: new
02: [mostly by Kevin's comments]
- rewritten to go through new flag BDRV_BLOCK_RECURSE
- never retry detection if failed for first time
- rewrite detection to do less iterations and to be more simple
iotests 102 behavior changed [and not sure about other two ones
in comparison with v1, but it seems it doesn't matter]
also, patch subject changed, as now it's a generic change for
block layer
Vladimir Sementsov-Ogievskiy (2):
tests/perf: Test lseek influence on qcow2 block-status
block: avoid recursive block_status call if possible
block/qcow2.h | 4 ++
include/block/block.h | 8 ++-
block/io.c | 9 ++-
block/qcow2-refcount.c | 32 ++++++++++
block/qcow2.c | 11 ++++
tests/perf/block/qcow2/convert-blockstatus | 71 ++++++++++++++++++++++
tests/qemu-iotests/102 | 2 +-
tests/qemu-iotests/102.out | 3 +-
tests/qemu-iotests/141.out | 2 +-
tests/qemu-iotests/144.out | 2 +-
10 files changed, 138 insertions(+), 6 deletions(-)
create mode 100755 tests/perf/block/qcow2/convert-blockstatus
--
2.18.0
