From: David Vrabel <david.vrabel@citrix.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
David Vrabel <david.vrabel@citrix.com>
Cc: xen-devel@lists.xenproject.org,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Daniel Kiper <daniel.kiper@oracle.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [Xen-devel] [PATCHv2 08/10] xen/balloon: use hotplugged pages for foreign mappings etc.
Date: Mon, 27 Jul 2015 11:18:43 +0100 [thread overview]
Message-ID: <55B60583.3010903@citrix.com> (raw)
In-Reply-To: <20150724185545.GD12824@l.oracle.com>
On 24/07/15 19:55, Konrad Rzeszutek Wilk wrote:
> On Fri, Jul 24, 2015 at 12:47:46PM +0100, David Vrabel wrote:
>> alloc_xenballooned_pages() is used to get ballooned pages to back
>> foreign mappings etc. Instead of having to balloon out real pages,
>> use (if supported) hotplugged memory.
>>
>> This makes more memory available to the guest and reduces
>> fragmentation in the p2m.
>>
>> If userspace is lacking a udev rule (or similar) to online hotplugged
>
> Is that udev rule already in distros?
Not all, which makes me think that this behaviour should be enabled by
userspace (via a module parameter). This would also allow me to drop
the timeout and fallback path which I put in to handle the no udev rule
case.
David
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WARNING: multiple messages have this Message-ID (diff)
From: David Vrabel <david.vrabel@citrix.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
David Vrabel <david.vrabel@citrix.com>
Cc: <xen-devel@lists.xenproject.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Daniel Kiper <daniel.kiper@oracle.com>,
<linux-kernel@vger.kernel.org>, <linux-mm@kvack.org>
Subject: Re: [Xen-devel] [PATCHv2 08/10] xen/balloon: use hotplugged pages for foreign mappings etc.
Date: Mon, 27 Jul 2015 11:18:43 +0100 [thread overview]
Message-ID: <55B60583.3010903@citrix.com> (raw)
In-Reply-To: <20150724185545.GD12824@l.oracle.com>
On 24/07/15 19:55, Konrad Rzeszutek Wilk wrote:
> On Fri, Jul 24, 2015 at 12:47:46PM +0100, David Vrabel wrote:
>> alloc_xenballooned_pages() is used to get ballooned pages to back
>> foreign mappings etc. Instead of having to balloon out real pages,
>> use (if supported) hotplugged memory.
>>
>> This makes more memory available to the guest and reduces
>> fragmentation in the p2m.
>>
>> If userspace is lacking a udev rule (or similar) to online hotplugged
>
> Is that udev rule already in distros?
Not all, which makes me think that this behaviour should be enabled by
userspace (via a module parameter). This would also allow me to drop
the timeout and fallback path which I put in to handle the no udev rule
case.
David
next prev parent reply other threads:[~2015-07-27 10:18 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-24 11:47 [PATCHv2 00/10] mm, xen/balloon: memory hotplug improvements David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` [PATCHv2 01/10] mm: memory hotplug with an existing resource David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-28 14:54 ` Daniel Kiper
2015-07-28 14:54 ` Daniel Kiper
2015-07-28 14:54 ` Daniel Kiper
2015-07-24 11:47 ` [PATCHv2 02/10] xen/balloon: remove scratch page left overs David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` [PATCHv2 03/10] x86/xen: discard RAM regions above the maximum reservation David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` [PATCHv2 04/10] xen/balloon: find non-conflicting regions to place hotplugged memory David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` [PATCHv2 05/10] xen/balloon: rationalize memory hotplug stats David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 18:54 ` Konrad Rzeszutek Wilk
2015-07-24 18:54 ` Konrad Rzeszutek Wilk
2015-07-24 18:54 ` Konrad Rzeszutek Wilk
2015-07-28 15:22 ` Daniel Kiper
2015-07-28 15:22 ` Daniel Kiper
2015-07-28 15:22 ` Daniel Kiper
2015-07-24 11:47 ` [PATCHv2 06/10] xen/balloon: only hotplug additional memory if required David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-29 15:55 ` Daniel Kiper
2015-07-29 15:55 ` Daniel Kiper
2015-07-29 15:55 ` Daniel Kiper
2015-07-29 16:02 ` David Vrabel
2015-07-29 16:02 ` David Vrabel
2015-07-29 16:02 ` David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` [PATCHv2 07/10] xen/balloon: make alloc_xenballoon_pages() always allocate low pages David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` [PATCHv2 08/10] xen/balloon: use hotplugged pages for foreign mappings etc David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 18:55 ` Konrad Rzeszutek Wilk
2015-07-24 18:55 ` Konrad Rzeszutek Wilk
2015-07-27 10:18 ` David Vrabel
2015-07-27 10:18 ` David Vrabel [this message]
2015-07-27 10:18 ` [Xen-devel] " David Vrabel
2015-07-24 18:55 ` Konrad Rzeszutek Wilk
2015-07-24 11:47 ` [PATCHv2 09/10] x86/xen: export xen_alloc_p2m_entry() David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 18:51 ` Konrad Rzeszutek Wilk
2015-07-24 18:51 ` Konrad Rzeszutek Wilk
2015-07-24 18:51 ` Konrad Rzeszutek Wilk
2015-07-29 16:10 ` Daniel Kiper
2015-07-29 16:10 ` Daniel Kiper
2015-07-29 16:10 ` Daniel Kiper
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` [PATCHv2 10/10] xen/balloon: pre-allocate p2m entries for ballooned pages David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 11:47 ` David Vrabel
2015-07-24 23:21 ` Julien Grall
2015-07-24 23:21 ` [Xen-devel] " Julien Grall
2015-07-24 23:21 ` Julien Grall
2015-07-27 9:30 ` David Vrabel
2015-07-27 9:30 ` [Xen-devel] " David Vrabel
2015-07-27 9:30 ` David Vrabel
2015-07-27 11:01 ` Julien Grall
2015-07-27 11:01 ` [Xen-devel] " Julien Grall
2015-07-27 11:01 ` Julien Grall
2015-07-27 12:40 ` David Vrabel
2015-07-27 12:40 ` [Xen-devel] " David Vrabel
2015-07-27 12:40 ` David Vrabel
2015-07-27 19:37 ` [PATCHv2 00/10] mm, xen/balloon: memory hotplug improvements Daniel Kiper
2015-07-27 19:37 ` Daniel Kiper
2015-07-27 19:37 ` Daniel Kiper
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