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Wed, 12 Mar 2025 00:07:29 +0000 (UTC) Received: from h1.redhat.com (unknown [10.22.88.56]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 20D971956094; Wed, 12 Mar 2025 00:07:20 +0000 (UTC) From: Nico Pache To: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, xen-devel@lists.xenproject.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org Cc: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, jerrin.shaji-george@broadcom.com, bcm-kernel-feedback-list@broadcom.com, arnd@arndb.de, gregkh@linuxfoundation.org, mst@redhat.com, david@redhat.com, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com, jgross@suse.com, sstabellini@kernel.org, oleksandr_tyshchenko@epam.com, akpm@linux-foundation.org, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, nphamcs@gmail.com, yosry.ahmed@linux.dev, kanchana.p.sridhar@intel.com, alexander.atanasov@virtuozzo.com Subject: [RFC 0/5] track memory used by balloon drivers Date: Tue, 11 Mar 2025 18:06:55 -0600 Message-ID: <20250312000700.184573-1-npache@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 4D43740007 X-Stat-Signature: erexmfhxfzf138ckf7bst1xqtmtbyoon X-HE-Tag: 1741738056-864274 X-HE-Meta: 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 Ubo617Dr eTyZUHo1wiIZVJQGwMl5LzRE7FMwduLYGjC+5KrO5nXCyjwFNVRNNiH2lNdYE7GzrQv3n9pzGwRDloRcMWP0D2CC70GG5QBlbUX6ciw/abX7yffr11LSy+6kr6k15e6fsrEtXdGJdCCh54xRpL/QPeE/1PRmzP0IV6lwPI5bKF1HSTpgMU0rn0vrhF6CPe3kzzLwOjpVRNHubYdMe3+eGt20Gr0v2On/au+ktme3r5vAczQIds7ZuYlR44xZUzL5MPAWoFrvou/btsJ/SMr0Di5qSuABs/VJnCXRXU8e7DzdlO9mksgsdrINJ+CM/Co77eLg2/1kNXEsMhFM= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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, and Xen) to maintain this counter. 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. Tested: virtio_balloon, run stress-ng, inflate balloon, oom prints Signed-off-by: Nico Pache Nico Pache (5): meminfo: add a per node counter for balloon drivers virtio_balloon: update the NR_BALLOON_PAGES state hv_balloon: update the NR_BALLOON_PAGES state vmx_balloon: update the NR_BALLOON_PAGES state xen: balloon: update the NR_BALLOON_PAGES state drivers/hv/hv_balloon.c | 2 ++ drivers/misc/vmw_balloon.c | 5 ++++- drivers/virtio/virtio_balloon.c | 4 ++++ drivers/xen/balloon.c | 4 ++++ fs/proc/meminfo.c | 2 ++ include/linux/mmzone.h | 1 + mm/memcontrol.c | 1 + mm/show_mem.c | 4 +++- mm/vmstat.c | 1 + 9 files changed, 22 insertions(+), 2 deletions(-)