linux-kernel - Re: [Xen-devel] Re: [PATCH 0/6] xen: don't call vmalloc_sync

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Message-ID: <4E7A3394.3090806@goop.org>
Date:	Wed, 21 Sep 2011 11:57:24 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [Xen-devel] Re: [PATCH 0/6] xen: don't call vmalloc_sync_all()
 when mapping foreign pages

On 09/21/2011 03:42 AM, Stefano Stabellini wrote:
> On Thu, 15 Sep 2011, Jeremy Fitzhardinge wrote:
>> This series is relying on regular ram mappings are already synced to all
>> tasks, but I'm not sure that's necessarily guaranteed (for example, if
>> you hotplug new memory into the domain, the new pages won't be mapped
>> into every mm unless they're synced).
> the series is using GFP_KERNEL, so this problem shouldn't occur, right?

What properties do you think GFP_KERNEL guarantees?

    J
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