linux-kernel - [PATCH v2 0/4] track memory used by balloon drivers

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Message-ID: <20250314213757.244258-1-npache@redhat.com>
Date: Fri, 14 Mar 2025 15:37:53 -0600
From: Nico Pache <npache@...hat.com>
To: linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	xen-devel@...ts.xenproject.org,
	linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org,
	virtualization@...ts.linux.dev
Cc: alexander.atanasov@...tuozzo.com,
	muchun.song@...ux.dev,
	roman.gushchin@...ux.dev,
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Subject: [PATCH v2 0/4] track memory used by balloon drivers

This series introduces a way to track memory used by balloon drivers.

Add a NR_BALLOON_PAGES counter to track how many pages are reclaimed by the
balloon drivers. First add the accounting, then updates the balloon drivers
(virtio, Hyper-V, VMware, Pseries-cmm, and Xen) to maintain this counter. The
virtio, Vmware, and pseries-cmm balloon drivers utilize the balloon_compaction
interface to allocate and free balloon pages. Other balloon drivers will have to
maintain this counter manually.

This makes the information visible in memory reporting interfaces like
/proc/meminfo, show_mem, and OOM reporting.

This provides admins visibility into their VM balloon sizes without
requiring different virtualization tooling. Furthermore, this information
is helpful when debugging an OOM inside a VM.

V2 changes:
- Add counter to the balloon_compaction interface
- Dropped patches for virtio and VMware as they use balloon_compaction interface

Tested: virtio_balloon, run stress-ng, inflate balloon, oom prints
Signed-off-by: Nico Pache <npache@...hat.com>

Nico Pache (4):
  meminfo: add a per node counter for balloon drivers
  balloon_compaction: update the NR_BALLOON_PAGES state
  hv_balloon: update the NR_BALLOON_PAGES state
  xen: balloon: update the NR_BALLOON_PAGES state

 drivers/hv/hv_balloon.c | 2 ++
 drivers/xen/balloon.c   | 4 ++++
 fs/proc/meminfo.c       | 2 ++
 include/linux/mmzone.h  | 1 +
 mm/balloon_compaction.c | 2 ++
 mm/show_mem.c           | 4 +++-
 mm/vmstat.c             | 1 +
 7 files changed, 15 insertions(+), 1 deletion(-)

-- 
2.48.1