linux-kernel - Re: [PATCH] xen/balloon: Set balloon's initial state to number of existing RAM pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20131106212919.GB23133@phenom.dumpdata.com>
Date:	Wed, 6 Nov 2013 16:29:19 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	david.vrabel@...rix.com, xen-devel@...ts.xenproject.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen/balloon: Set balloon's initial state to number of
 existing RAM pages

On Wed, Nov 06, 2013 at 03:37:40PM -0500, Boris Ostrovsky wrote:
> Currently balloon's initial value is set to max_pfn which includes
> non-RAM ranges such as MMIO hole. As result, initial memory target
> (specified by guest's configuration file) will appear smaller than
> what balloon driver perceives to be the current number of available
> pages. Thus it will balloon down "extra" pages, decreasing amount of
> available memory for no good reason.

Duh!

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> ---
>  drivers/xen/balloon.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
> index b232908..1b62304 100644
> --- a/drivers/xen/balloon.c
> +++ b/drivers/xen/balloon.c
> @@ -641,7 +641,7 @@ static int __init balloon_init(void)
>  
>  	balloon_stats.current_pages = xen_pv_domain()
>  		? min(xen_start_info->nr_pages - xen_released_pages, max_pfn)
> -		: max_pfn;
> +		: get_num_physpages();
>  	balloon_stats.target_pages  = balloon_stats.current_pages;
>  	balloon_stats.balloon_low   = 0;
>  	balloon_stats.balloon_high  = 0;
> -- 
> 1.8.1.4
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/