[Qemu-devel] [PATCH V8 0/5] Continuous Leaky Bucket Throttling

["Benoît Canet" <benoit@irqsave.net>]

This patchset implement continous leaky bucket throttling.

It use two requests queue to enable to do silly unbalanced throttling like
block_set_io_throttle 0 0 0 0 6000 1

It use two timer to get the timer callbacks and the throttle.c code simple

in this version:

   rearm timer only when it's not pending [Stefan]
   Schedule next request right after accouting it [Stefan]

v7:
   honor max values if specified [Paolo]
   s/cfg/Linux CFQ/ [Stefan]
   revert throttle_get_config to it's old prototype [Stefan]
   s/size/@size/ [Stefan]
   s/acccount/account/ [Stefan]
   remove tracked_request_end uneeded hunk [Stefan]
   Spaces before (json-int)s [Stefan]

v5-V6:
Rebased on top of Stefan's block branch.

switch to new timer API [Benoît]

s/timerstamp/timestamp/g [Fam]
Use QEMUTimerCB [Fam]
qemu_get_config return reference [Fam]
rename throttle_allowed to throttle_schedule_timer [Fam]
remove now parameter from throttle_compute_wait_for  [Fam]
rename next_timer to next_timestamp [Fam]
rename ups to avg [Paolo]
let the enum numbering to the work [Paolo]
merge BUCKET_COUNT in the enum [Paolo]
rename bucket to level [Benoît/Stefan]
THROTTLING_H -> THROTTLE_H [Stefan]
use BUCKETS_COUNT in array declaration [Stefan]
remove unit_size [Stefan]
s/delta/delta_ns/g [Stefan]
remove qemu_timer_pending checks [Stefan]
explain magic [Stefan]

s/make/makes/ [Fam]
s/executed/executed,/[Fam]
s/bdrv_drain_throttled/bdrv_start_throttled_reqs/ [Stefan]
assert(!bs->io_limits enabled); [Stefan]
move outside tracked_request_begin/end [Stefan]

s/bycket/bucket/ [Stefan]
s/algoritm/algorithm/ [Stefan]
s/QMP/HMP/ [Stefan]
add missing space [Stefan]
Add \n in qemu-options.hx [Benoît]

rename iops_sector_count to iops_size [Stefan]

V4-V5
Fix bdrv_drain_all broken logic hence fixing the assertion error at exit.

v3-V4:
    wrap qemu-option.hx declararation [Eric]
    continuus -> continuous [Fam]
    unit test [Paolo]


Benoît Canet (5):
  throttle: Add a new throttling API implementing continuous leaky
    bucket.
  throttle: Add units tests
  block: Enable the new throttling code in the block layer.
  block: Add support for throttling burst max in QMP and the command
    line.
  block: Add iops_size to do the iops accounting for a given io size.

 block.c                   |  338 +++++++++----------------------
 block/qapi.c              |   50 +++--
 blockdev.c                |  205 ++++++++++++++-----
 hmp.c                     |   36 +++-
 include/block/block.h     |    1 -
 include/block/block_int.h |   32 +--
 include/qemu/throttle.h   |  103 ++++++++++
 qapi-schema.json          |   40 +++-
 qemu-options.hx           |    4 +-
 qmp-commands.hx           |   34 +++-
 tests/Makefile            |    2 +
 tests/test-throttle.c     |  481 +++++++++++++++++++++++++++++++++++++++++++++
 util/Makefile.objs        |    1 +
 util/throttle.c           |  396 +++++++++++++++++++++++++++++++++++++
 14 files changed, 1384 insertions(+), 339 deletions(-)
 create mode 100644 include/qemu/throttle.h
 create mode 100644 tests/test-throttle.c
 create mode 100644 util/throttle.c

-- 
1.7.10.4