linux-kernel - Re: [PATCH v2 1/4] meminfo: add a per node counter for balloon drivers

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Message-Id: <20250314180625.8c3a2a5a990a132a7b0b9072@linux-foundation.org>
Date: Fri, 14 Mar 2025 18:06:25 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Nico Pache <npache@...hat.com>
Cc: 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,
 alexander.atanasov@...tuozzo.com, muchun.song@...ux.dev,
 roman.gushchin@...ux.dev, mhocko@...nel.org, kys@...rosoft.com,
 haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
 jgross@...e.com, sstabellini@...nel.org, oleksandr_tyshchenko@...m.com,
 mst@...hat.com, david@...hat.com, yosry.ahmed@...ux.dev,
 hannes@...xchg.org, nphamcs@...il.com, chengming.zhou@...ux.dev,
 kanchana.p.sridhar@...el.com, llong@...hat.com, shakeel.butt@...ux.dev
Subject: Re: [PATCH v2 1/4] meminfo: add a per node counter for balloon
 drivers

On Fri, 14 Mar 2025 15:37:54 -0600 Nico Pache <npache@...hat.com> wrote:

> Add NR_BALLOON_PAGES counter to track memory used by balloon drivers and
> expose it through /proc/meminfo and other memory reporting interfaces.
> 
> ...
>
> --- a/fs/proc/meminfo.c
> +++ b/fs/proc/meminfo.c
> @@ -162,6 +162,8 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
>  	show_val_kb(m, "Unaccepted:     ",
>  		    global_zone_page_state(NR_UNACCEPTED));
>  #endif
> +	show_val_kb(m, "Balloon:        ",
> +		    global_node_page_state(NR_BALLOON_PAGES));

Please update Documentation/filesystems/proc.rst for this.