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[PATCH v4 0/7] Make balloon drivers memory changes known to the rest of the kernel



Currently balloon drivers (Virtio,XEN, HyperV, VMWare, ...)
inflate and deflate the guest memory size but there is no
way to know how much the memory size is changed by them.

A common use of the ballooning is to emulate [1]
hot plug and hot unplug - due to the complexity of the later.
Hotplug has a notifier and one can also check the updated
memory size.

To improve this add InflatedTotal and InflatedFree
to /proc/meminfo and implement a balloon notifier.

Amount of inflated memory can be used:
 - si_meminfo(..) users can improve calculations
 - adjust cache/buffer sizes
 - adjust object/connection limits
 - as a hint for the oom a killer
 - by user space software that monitors memory pressure

Alexander Atanasov (7):
  Make place for common balloon code
  Enable balloon drivers to report inflated memory
  Display inflated memory to users
  drivers: virtio: balloon - update inflated memory
  Display inflated memory in logs
  drivers: vmware: balloon - report inflated memory
  drivers: hyperv: balloon - report inflated memory

 Documentation/filesystems/proc.rst            |  6 +++
 MAINTAINERS                                   |  4 +-
 arch/powerpc/platforms/pseries/cmm.c          |  2 +-
 drivers/hv/hv_balloon.c                       | 11 +++++
 drivers/misc/vmw_balloon.c                    |  6 ++-
 drivers/virtio/virtio_balloon.c               |  7 +++-
 fs/proc/meminfo.c                             | 10 +++++
 .../linux/{balloon_compaction.h => balloon.h} | 30 ++++++++++----
 lib/show_mem.c                                |  8 ++++
 mm/Makefile                                   |  2 +-
 mm/{balloon_compaction.c => balloon.c}        | 40 +++++++++++++++++--
 mm/migrate.c                                  |  1 -
 mm/vmscan.c                                   |  1 -
 13 files changed, 110 insertions(+), 18 deletions(-)
 rename include/linux/{balloon_compaction.h => balloon.h} (86%)
 rename mm/{balloon_compaction.c => balloon.c} (88%)

v4:
 - add support in hyperV and vmware balloon drivers
 - display balloon memory in show_mem so it is logged on OOM and on sysrq
v3:
 - added missed EXPORT_SYMBOLS
Reported-by: kernel test robot <lkp@xxxxxxxxx>
 - instead of balloon_common.h just use balloon.h (yes, naming is hard)
 - cleaned up balloon.h - remove from files that do not use it and
   remove externs from function declarations
v2:
 - reworked from simple /proc/meminfo addition

Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Wei Liu <wei.liu@xxxxxxxxxx>
Cc: Nadav Amit <namit@xxxxxxxxxx>
Cc: pv-drivers@xxxxxxxxxx
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
Cc: Dexuan Cui <decui@xxxxxxxxxxxxx>
Cc: linux-hyperv@xxxxxxxxxxxxxxx
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx

1. https://lore.kernel.org/lkml/f0f12c84-a62e-5f8b-46ab-a651fe8f8589@xxxxxxxxxx/

base-commit: 2bca25eaeba6190efbfcb38ed169bd7ee43b5aaf
-- 
2.31.1




 


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