From: David Vrabel <david.vrabel@citrix.com>
To: Juergen Gross <jgross@suse.com>, <linux-kernel@vger.kernel.org>,
<xen-devel@lists.xensource.com>, <konrad.wilk@oracle.com>,
<david.vrabel@citrix.com>, <boris.ostrovsky@oracle.com>,
<x86@kernel.org>, <tglx@linutronix.de>, <mingo@redhat.com>,
<hpa@zytor.com>
Subject: Re: [Xen-devel] [PATCH V3 7/8] xen: switch to linear virtual mapped sparse p2m list
Date: Tue, 11 Nov 2014 17:47:55 +0000 [thread overview]
Message-ID: <54624BCB.9040300@citrix.com> (raw)
In-Reply-To: <1415684626-18590-8-git-send-email-jgross@suse.com>
On 11/11/14 05:43, Juergen Gross wrote:
> At start of the day the Xen hypervisor presents a contiguous mfn list
> to a pv-domain. In order to support sparse memory this mfn list is
> accessed via a three level p2m tree built early in the boot process.
> Whenever the system needs the mfn associated with a pfn this tree is
> used to find the mfn.
>
> Instead of using a software walked tree for accessing a specific mfn
> list entry this patch is creating a virtual address area for the
> entire possible mfn list including memory holes. The holes are
> covered by mapping a pre-defined page consisting only of "invalid
> mfn" entries. Access to a mfn entry is possible by just using the
> virtual base address of the mfn list and the pfn as index into that
> list. This speeds up the (hot) path of determining the mfn of a
> pfn.
>
> Kernel build on a Dell Latitude E6440 (2 cores, HT) in 64 bit Dom0
> showed following improvements:
>
> Elapsed time: 32:50 -> 32:35
> System: 18:07 -> 17:47
> User: 104:00 -> 103:30
>
> Tested on 64 bit dom0 and 32 bit domU.
Reviewed-by: David Vrabel <david.vrabel@citrix.com>
Can you please test this with the following guests/scenarios.
* 64 bit dom0 with PCI devices with high MMIO BARs.
* 32 bit domU with PCI devices assigned.
* 32 bit domU with 64 GiB of memory.
* domU that starts pre-ballooned and is subsequently ballooned up.
* 64 bit domU that is saved and restored (or local host migration)
* 32 bit domU that is saved and restored (or local host migration)
Thanks.
David
next prev parent reply other threads:[~2014-11-11 17:48 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-11 5:43 [PATCH V3 0/8] xen: Switch to virtual mapped linear p2m list Juergen Gross
2014-11-11 5:43 ` [PATCH V3 1/8] xen: Make functions static Juergen Gross
2014-11-11 10:21 ` [Xen-devel] " David Vrabel
2014-11-11 10:36 ` Juergen Gross
2014-11-11 10:50 ` David Vrabel
2014-11-11 10:55 ` Jürgen Groß
2014-11-11 5:43 ` [PATCH V3 2/8] xen: Delay remapping memory of pv-domain Juergen Gross
2014-11-11 11:45 ` [Xen-devel] " Andrew Cooper
2014-11-11 12:03 ` Juergen Gross
2014-11-12 21:45 ` Konrad Rzeszutek Wilk
2014-11-13 6:23 ` Juergen Gross
2014-11-13 19:56 ` Konrad Rzeszutek Wilk
2014-11-14 4:53 ` Juergen Gross
2014-11-14 11:16 ` [Xen-devel] " David Vrabel
2014-11-14 16:47 ` Konrad Rzeszutek Wilk
2014-11-14 17:14 ` Juergen Gross
2014-11-19 19:43 ` Konrad Rzeszutek Wilk
2014-11-20 4:59 ` Juergen Gross
2014-11-11 5:43 ` [PATCH V3 3/8] xen: Delay m2p_override initialization Juergen Gross
2014-11-11 10:29 ` [Xen-devel] " David Vrabel
2014-11-12 18:35 ` Konrad Rzeszutek Wilk
2014-11-11 5:43 ` [PATCH V3 4/8] xen: Delay invalidating extra memory Juergen Gross
2014-11-12 22:10 ` Konrad Rzeszutek Wilk
2014-11-13 6:49 ` Juergen Gross
2014-11-13 19:56 ` Konrad Rzeszutek Wilk
2014-11-11 5:43 ` [PATCH V3 5/8] x86: Introduce function to get pmd entry pointer Juergen Gross
2014-11-12 22:12 ` Konrad Rzeszutek Wilk
2014-11-13 6:54 ` Juergen Gross
2014-11-13 20:01 ` Konrad Rzeszutek Wilk
2014-11-11 5:43 ` [PATCH V3 6/8] xen: Hide get_phys_to_machine() to be able to tune common path Juergen Gross
2014-11-11 17:38 ` [Xen-devel] " David Vrabel
2014-11-12 22:18 ` Konrad Rzeszutek Wilk
2014-11-13 9:15 ` Juergen Gross
2014-11-13 13:51 ` Konrad Rzeszutek Wilk
2014-11-11 5:43 ` [PATCH V3 7/8] xen: switch to linear virtual mapped sparse p2m list Juergen Gross
2014-11-11 17:47 ` David Vrabel [this message]
2014-11-13 9:21 ` [Xen-devel] " Juergen Gross
2014-11-14 11:58 ` David Vrabel
2014-11-14 12:42 ` Juergen Gross
2014-11-19 20:38 ` Konrad Rzeszutek Wilk
2014-11-19 20:37 ` Konrad Rzeszutek Wilk
2014-11-11 5:43 ` [PATCH V3 8/8] xen: Speed up set_phys_to_machine() by using read-only mappings Juergen Gross
2014-11-11 17:48 ` [Xen-devel] " David Vrabel
2014-11-19 20:39 ` Konrad Rzeszutek Wilk
2014-11-19 20:41 ` [PATCH V3 0/8] xen: Switch to virtual mapped linear p2m list Konrad Rzeszutek Wilk
2014-11-20 5:08 ` Juergen Gross
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