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Date: Wed, 10 Jul 2013 16:08:36 -0700
From: Dave Hansen <dave.hansen@intel.com>
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Subject: Re: [PATCH] mm: add sys_madvise2 and MADV_NAME to name vmas
References: <1372901537-31033-1-git-send-email-ccross@android.com>
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To: Colin Cross <ccross@android.com>
Cc: linux-kernel@vger.kernel.org, Kyungmin Park <kmpark@infradead.org>, Christoph Hellwig <hch@infradead.org>, John Stultz <john.stultz@linaro.org>, Rob Landley <rob@landley.net>, Arnd Bergmann <arnd@arndb.de>, Andrew Morton <akpm@linux-foundation.org>, Cyrill Gorcunov <gorcunov@openvz.org>, David Rientjes <rientjes@google.com>, Davidlohr Bueso <dave@gnu.org>, Kees Cook <keescook@chromium.org>, Al Viro <viro@zeniv.linux.org.uk>, Hugh Dickins <hughd@google.com>, Mel Gorman <mgorman@suse.de>, Michel Lespinasse <walken@google.com>, Rik van Riel <riel@redhat.com>, Konstantin Khlebnikov <khlebnikov@openvz.org>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Rusty Russell <rusty@rustcorp.com.au>, "Eric W. Biederman" <ebiederm@xmission.com>, Oleg Nesterov <oleg@redhat.com>, Srikar Dronamraju <srikar@linux.vnet.ibm.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Michal Hocko <mhocko@suse.cz>, Anton Vorontsov <anton.vorontsov@linaro.org>, Pekka Enberg <penberg@kernel.org>, Shaohua Li <shli@fusionio.com>, Sasha Levin <sasha.levin@oracle.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Johannes Weiner <hannes@cmpxchg.org>, Ingo Molnar <mingo@kernel.org>, open@kvack.org, list@kvack.org, DOCUMENTATION <linux-doc@vger.kernel.org>open@kvack.orglist@kvack.org, MEMORY MANAGEMENT <linux-mm@kvack.org>, "open list:GENERIC INCLUDE/A..." <linux-arch@vger.kernel.org>

On 07/03/2013 06:31 PM, Colin Cross wrote:
> @@ -289,6 +291,7 @@ struct vm_area_struct {
>  #ifdef CONFIG_NUMA
>  	struct mempolicy *vm_policy;	/* NUMA policy for the VMA */
>  #endif
> +	struct vma_name *vm_name;
>  };

You could probably get rid of the extra pointer by unioning this with
vm_file.  They should not ever get used together.  We would, however,
have to transition away from checking vma->vm_file for "is this vma
file-backed"?  We are out of VM_* flag space which is a bummer.

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