Modify command 'block-latency-histogram-set' to make block histogram
interface common to use. And support block size histogram.
Thanks to Eric Blake&Vladimir Sementsov-Ogievskiy for the suggestions.
This command has been tested for half year on QEMU-2.12, and we found
that 3K+ virtual machines write 25GB/s totally, the block size
histogram like following:
0 ~ 8k: 58% ~ 62%
8k ~ 32k: 10% ~ 12%
32k ~ 128k: 2% ~ 3%
128K ~ 512K: 24% ~ 26%
512K ~ : ...
And the histogram data help us to optimise backend distributed
storage.
Changelog:
v2:
- make 'block-latency-histogram-set' common.
- remove duplicated functions.
- fix uncommon indentation(reviewed by Vladimir Sementsov-Ogievskiy).
zhenwei pi (3):
block/accounting: rename struct BlockLatencyHistogram
block/accounting: introduce block size histogram
qapi: make block histogram interface common
block/accounting.c | 62 ++++++++++++++++++++--------
block/qapi.c | 32 ++++++++------
blockdev.c | 33 +++++++++++----
include/block/accounting.h | 13 +++---
qapi/block-core.json | 101 +++++++++++++++++++++++++++------------------
5 files changed, 158 insertions(+), 83 deletions(-)
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2.11.0