[PATCH 0/4] hv_balloon: fixes for num_pages_onlined accounting and misc improvements

[Vitaly Kuznetsov]

While doing routing code review I noticed that commit 6df8d9aaf3af
("Drivers: hv: balloon: Correctly update onlined page count") introduced
an issue with num_pages_onlined accounting on memory offlining. Deeper look
showed that the accounting was always buggy. This is fixed in PATCH3.
PATCHes 1 and 2 are preparatory cleanups, PATCH4 adds a tracepoint to
post_status so it's now possible to see what's being sent to the host and
where the data comes from.

One more thing: currently core MM code forbids offlining blocks with
reserved pages in it, I plat to send a patch making it possible.

Tested with WS2016 only.

Vitaly Kuznetsov (4):
  hv_balloon: fix printk loglevel
  hv_balloon: simplify hv_online_page()/hv_page_online_one()
  hv_balloon: fix bugs in num_pages_onlined accounting
  hv_balloon: trace post_status

 drivers/hv/Makefile           |   1 +
 drivers/hv/hv_balloon.c       | 121 +++++++++++++++++++++++++++++-------------
 drivers/hv/hv_trace_balloon.h |  48 +++++++++++++++++
 3 files changed, 132 insertions(+), 38 deletions(-)
 create mode 100644 drivers/hv/hv_trace_balloon.h

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2.13.6