linux-kernel - Re: [PATCH] drivers: xen-selfballoon: consider slab pages

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Message-ID: <20131104151336.GA32546@phenom.dumpdata.com>
Date:	Mon, 4 Nov 2013 10:13:36 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Bob Liu <lliubbo@...il.com>
Cc:	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	Bob Liu <bob.liu@...cle.com>
Subject: Re: [PATCH] drivers: xen-selfballoon: consider slab pages

On Mon, Nov 04, 2013 at 08:39:24PM +0800, Bob Liu wrote:
> Currently the goal_page in xen-selfballon doesn't consider much about pages used
> in kernel space.
> A typical usage is slab pages, without consider slab pages the goal_page result
> may be too rough and lead extra memory pressure to guest os.

Does  "lead extra memory pressure" mean OOM?

> 
> Signed-off-by: Bob Liu <bob.liu@...cle.com>
> ---
>  drivers/xen/xen-selfballoon.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c
> index 21e18c1..4814759 100644
> --- a/drivers/xen/xen-selfballoon.c
> +++ b/drivers/xen/xen-selfballoon.c
> @@ -191,6 +191,8 @@ static void selfballoon_process(struct work_struct *work)
>  		tgt_pages = cur_pages; /* default is no change */
>  		goal_pages = vm_memory_committed() +
>  				totalreserve_pages +
> +				global_page_state(NR_SLAB_RECLAIMABLE) +
> +				global_page_state(NR_SLAB_UNRECLAIMABLE) +
>  				MB2PAGES(selfballoon_reserved_mb);
>  #ifdef CONFIG_FRONTSWAP
>  		/* allow space for frontswap pages to be repatriated */
> -- 
> 1.7.10.4
> 
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