From patchwork Wed Mar 12 00:06:55 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nico Pache X-Patchwork-Id: 14012757 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A9DAF4A01 for ; Wed, 12 Mar 2025 00:07:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741738058; cv=none; b=GJwQvuX51WD9jUGPUjrQ3WdSs2DqsaTn8hxr7zDBHDEDV0pZj+mBBZTCQdZl8cILynPvfhkO2hmam6flUIEg/fK6A/Y2cnBfrrqP+4Hl8ht+um0d7sqfbbb8dWEgCnkESSDTgTzChhUKG4ObLmUO1JJByf/KEO81LM5y+zTqNlE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741738058; c=relaxed/simple; bh=ahoiaCICAThel6fGzAyXhFBeyWeKIoJcx5Q+1e5zZN4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=uV8i4sJqU0wuJ//xD6DqDCM5OZFTrsc7VGB2qp2suNwq/4SDLnvl7AUGr2OkeoGIIk7uohq4ToUjxkh46X/jB72s8FCrZQgwQbz/K55B4g/XeoOhc7OdUFGYbLBGj80tpOjRwBw3bzZGrkc+QEGLU8vccfySt164ppk/c+emj4o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=c8b/YNwO; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="c8b/YNwO" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1741738055; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=+Jp3d8TwivY0inesFFsBMmfW4NNIDtSVjUkd3EkZcf4=; b=c8b/YNwOHP7J7drlwWoxoirX7EupAtG4LZTPFPSxOnJ3Gd9w5688d/Ng2yGtJ2reHkJBNY XAM9upSqu+yhuiDjAm5XRNpRWNwnZXgxAOmHc43nSYtqqh1kggCeIMUFEt5zwt3hqFM4wJ FWfp/so7rKASrR2EC584eW2VzOWQEt8= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-607-tVpdxDOENfqjZCOHY5FruQ-1; Tue, 11 Mar 2025 20:07:34 -0400 X-MC-Unique: tVpdxDOENfqjZCOHY5FruQ-1 X-Mimecast-MFC-AGG-ID: tVpdxDOENfqjZCOHY5FruQ_1741738051 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id F07CE195608A; 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> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 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(-)