From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Miroslav Rezanina <mrezanin@redhat.com>
Cc: linux-kernel@vger.kernel.org, xen-devel@lists.xensource.com,
Gianluca Guida <gianluca.guida@citrix.com>
Subject: Re: [PATCH][v2.6.29][XEN] Return unused memory to hypervisor
Date: Thu, 20 Aug 2009 09:39:02 -0700 [thread overview]
Message-ID: <4A8D7C26.5020902@goop.org> (raw)
In-Reply-To: <2039875032.3531250754474167.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
On 08/20/09 00:47, Miroslav Rezanina wrote:
> there is handled e820 map in guest. However, this patch informs
> hypervisor, that guest uses less memory than was assigned to it.
> If hypervisor is not informed, memory is reserved for guest that
> do not need it. If hypervisor is informed, he decrease memory
> reservation for guest and unused memory is marked as free
> for use by other guests.
>
Yes. But the guest will modify its own e820 map for a number of
reasons; for example: reducing its own memory, or clearing a space for
the PCI hole. In general we want to free any underlying pages which
don't correspond to E820_RAM regions.
J
WARNING: multiple messages have this Message-ID (diff)
From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Miroslav Rezanina <mrezanin@redhat.com>
Cc: xen-devel@lists.xensource.com, linux-kernel@vger.kernel.org,
Gianluca Guida <gianluca.guida@citrix.com>
Subject: Re: [PATCH][v2.6.29][XEN] Return unused memory to hypervisor
Date: Thu, 20 Aug 2009 09:39:02 -0700 [thread overview]
Message-ID: <4A8D7C26.5020902@goop.org> (raw)
In-Reply-To: <2039875032.3531250754474167.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
On 08/20/09 00:47, Miroslav Rezanina wrote:
> there is handled e820 map in guest. However, this patch informs
> hypervisor, that guest uses less memory than was assigned to it.
> If hypervisor is not informed, memory is reserved for guest that
> do not need it. If hypervisor is informed, he decrease memory
> reservation for guest and unused memory is marked as free
> for use by other guests.
>
Yes. But the guest will modify its own e820 map for a number of
reasons; for example: reducing its own memory, or clearing a space for
the PCI hole. In general we want to free any underlying pages which
don't correspond to E820_RAM regions.
J
next prev parent reply other threads:[~2009-08-20 16:39 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <131246341.771871250687008542.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
2009-08-19 13:05 ` [PATCH][v2.6.29][XEN] Return unused memory to hypervisor Miroslav Rezanina
2009-08-19 13:05 ` Miroslav Rezanina
2009-08-19 16:16 ` Jeremy Fitzhardinge
2009-08-20 7:47 ` Miroslav Rezanina
2009-08-20 7:47 ` Miroslav Rezanina
2009-08-20 16:39 ` Jeremy Fitzhardinge [this message]
2009-08-20 16:39 ` Jeremy Fitzhardinge
2009-09-07 12:41 ` Miroslav Rezanina
2009-09-07 12:41 ` Miroslav Rezanina
2009-09-08 18:58 ` Jeremy Fitzhardinge
2009-09-08 18:58 ` Jeremy Fitzhardinge
2009-08-20 9:31 ` [Xen-devel] " Gianluca Guida
2009-08-20 9:31 ` Gianluca Guida
2009-08-20 11:36 ` [PATCH v2][v2.6.29][XEN] " Miroslav Rezanina
2009-09-03 23:26 ` [PATCH][v2.6.29][XEN] " Jeremy Fitzhardinge
2009-09-03 23:26 ` Jeremy Fitzhardinge
2009-09-04 5:29 ` Miroslav Rezanina
[not found] <1152394510.61021250842386600.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
2009-08-21 8:14 ` Miroslav Rezanina
2009-08-21 8:14 ` Miroslav Rezanina
2009-08-21 11:51 ` Gianluca Guida
2009-08-21 11:51 ` Gianluca Guida
[not found] <1582654680.152201253087647836.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
2009-09-16 7:56 ` Miroslav Rezanina
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