migration/hmp: Add "info migrate -a", reorg the dump

A new parameter "-a" is added to "info migrate" to dump all info, while
when not specified it only dumps the important ones.  When at it, reorg
everything to make it easier to read for human.

The general rule is:

  - Put important things at the top
  - Reuse a single line when things are very relevant, hence reducing lines
    needed to show the results
  - Remove almost useless ones (e.g. "normal_bytes", while we also have
    both "page size" and "normal" pages)
  - Regroup things, so that related fields will show together
  - etc.

Before this change, it looks like (one example of a completed case):

  globals:
  store-global-state: on
  only-migratable: off
  send-configuration: on
  send-section-footer: on
  send-switchover-start: on
  clear-bitmap-shift: 18
  Migration status: completed
  total time: 122952 ms
  downtime: 76 ms
  setup: 15 ms
  transferred ram: 130825923 kbytes
  throughput: 8717.68 mbps
  remaining ram: 0 kbytes
  total ram: 16777992 kbytes
  duplicate: 997263 pages
  normal: 32622225 pages
  normal bytes: 130488900 kbytes
  dirty sync count: 10
  page size: 4 kbytes
  multifd bytes: 117134260 kbytes
  pages-per-second: 169431
  postcopy request count: 5835
  precopy ram: 15 kbytes
  postcopy ram: 13691151 kbytes

After this change, sample output (default, no "-a" specified):

  Status: postcopy-active
  Time (ms): total=40504, setup=14, down=145
  RAM info:
    Bandwidth (mbps): 6102.65
    Sizes (KB): psize=4, total=16777992,
      transferred=37673019, remain=2136404,
      precopy=3, multifd=26108780, postcopy=11563855
    Pages: normal=9394288, zero=600672, rate_per_sec=185875
    Others: dirty_syncs=3, dirty_pages_rate=278378, postcopy_req=4078

Sample output when "-a" specified:

  Status: active
  Time (ms): total=3040, setup=4, exp_down=300
  RAM info:
    Throughput (mbps): 10.51
    Sizes (KB): psize=4, total=4211528,
      transferred=3979, remain=4206452,
      precopy=3978, multifd=0, postcopy=0
    Pages: normal=992, zero=277, rate_per_sec=320
    Others: dirty_syncs=1
  Globals:
    store-global-state: on
    only-migratable: off
    send-configuration: on
    send-section-footer: on
    send-switchover-start: on
    clear-bitmap-shift: 18
  XBZRLE: size=67108864, transferred=0, pages=0, miss=188451
    miss_rate=0.00, encode_rate=0.00, overflow=0
  CPU Throttle (%): 0
  Dirty-limit Throttle (us): 0
  Dirty-limit Ring Full (us): 0
  Postcopy Blocktime (ms): 0
  Postcopy vCPU Blocktime: ...

Reviewed-by: Dr. David Alan Gilbert <dave@treblig.org>
Tested-by: Mario Casquero <mcasquer@redhat.com>
[peterx: print "," too in 1st line of RAM info]
Signed-off-by: Peter Xu <peterx@redhat.com>

0 files changed, 0 insertions, 0 deletions