From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: xen-devel@lists.xensource.com, Andi Kleen <ak@suse.de>,
linux-kernel@vger.kernel.org, Chris Wright <chrisw@sous-sol.org>,
virtualization@lists.osdl.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: Re: [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries
Date: Wed, 21 Feb 2007 15:27:21 -0800 [thread overview]
Message-ID: <45DCD559.1040301@goop.org> (raw)
In-Reply-To: <1172100002.13378.42.camel@localhost.localdomain>
Rusty Russell wrote:
> On Wed, 2007-02-21 at 23:15 +0100, Andi Kleen wrote:
>
>> On Wednesday 21 February 2007 21:52, Jeremy Fitzhardinge wrote:
>>
>>> Add a set of accessors to pack, unpack and modify page table entries
>>> (at all levels). This allows a paravirt implementation to control the
>>> contents of pgd/pmd/pte entries. For example, Xen uses this to
>>> convert the (pseudo-)physical address into a machine address when
>>> populating a pagetable entry, and converting back to pphys address
>>> when an entry is read.
>>>
>> Do you have some lmbench numbers before/after this change?
>> iirc at least fork and exit do a lot of pte accesses in various forms.
>> If it's measurable it might be needed to patch those for the native case.
>>
>
> Yes, __mkpte must be patched to avoid performance embarrassment.
>
> Jeremy, did you want me to do this, or are you happy to?
>
I'm working on it now. I'll mail out a proposal in a little bit.
J
WARNING: multiple messages have this Message-ID (diff)
From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: Andi Kleen <ak@suse.de>, Chris Wright <chrisw@sous-sol.org>,
virtualization@lists.osdl.org,
Andrew Morton <akpm@linux-foundation.org>,
xen-devel@lists.xensource.com, linux-kernel@vger.kernel.org
Subject: Re: [Xen-devel] Re: [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries
Date: Wed, 21 Feb 2007 15:27:21 -0800 [thread overview]
Message-ID: <45DCD559.1040301@goop.org> (raw)
In-Reply-To: <1172100002.13378.42.camel@localhost.localdomain>
Rusty Russell wrote:
> On Wed, 2007-02-21 at 23:15 +0100, Andi Kleen wrote:
>
>> On Wednesday 21 February 2007 21:52, Jeremy Fitzhardinge wrote:
>>
>>> Add a set of accessors to pack, unpack and modify page table entries
>>> (at all levels). This allows a paravirt implementation to control the
>>> contents of pgd/pmd/pte entries. For example, Xen uses this to
>>> convert the (pseudo-)physical address into a machine address when
>>> populating a pagetable entry, and converting back to pphys address
>>> when an entry is read.
>>>
>> Do you have some lmbench numbers before/after this change?
>> iirc at least fork and exit do a lot of pte accesses in various forms.
>> If it's measurable it might be needed to patch those for the native case.
>>
>
> Yes, __mkpte must be patched to avoid performance embarrassment.
>
> Jeremy, did you want me to do this, or are you happy to?
>
I'm working on it now. I'll mail out a proposal in a little bit.
J
next prev parent reply other threads:[~2007-02-21 23:27 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-21 20:52 [patch 00/24] Xen-paravirt_ops: Xen guest implementation for paravirt_ops interface Jeremy Fitzhardinge
2007-02-21 20:52 ` [patch 01/24] Xen-paravirt_ops: No need to use -traditional for processing asm in arch/i386/ Jeremy Fitzhardinge
2007-02-21 20:52 ` [patch 02/24] Xen-paravirt_ops: Clean up ELF note generation Jeremy Fitzhardinge
2007-02-21 20:52 ` [patch 03/24] Xen-paravirt_ops: Fix typo in sync_constant_test_bit()s name Jeremy Fitzhardinge
2007-02-21 20:52 ` [patch 04/24] Xen-paravirt_ops: ignore vgacon if hardware not present Jeremy Fitzhardinge
2007-02-21 20:52 ` [patch 05/24] Xen-paravirt_ops: Add pagetable accessors to pack and unpack pagetable entries Jeremy Fitzhardinge
2007-02-21 22:15 ` Andi Kleen
2007-02-21 22:15 ` Andi Kleen
2007-02-21 22:20 ` Jeremy Fitzhardinge
2007-02-21 22:20 ` Jeremy Fitzhardinge
2007-02-21 23:20 ` Rusty Russell
2007-02-21 23:20 ` Rusty Russell
2007-02-21 23:27 ` Jeremy Fitzhardinge [this message]
2007-02-21 23:27 ` [Xen-devel] " Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 06/24] Xen-paravirt_ops: paravirt_ops: hooks to set up initial pagetable Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 07/24] Xen-paravirt_ops: paravirt_ops: allocate a fixmap slot Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 08/24] Xen-paravirt_ops: Allow paravirt backend to choose kernel PMD sharing Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 09/24] Xen-paravirt_ops: add hooks to intercept mm creation and destruction Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 10/24] Xen-paravirt_ops: remove HAVE_ARCH_MM_LIFETIME, define no-op architecture implementations Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 11/24] Xen-paravirt_ops: Add apply_to_page_range() which applies a function to a pte range Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 12/24] Xen-paravirt_ops: Allocate and free vmalloc areas Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 13/24] Xen-paravirt_ops: Add nosegneg capability to the vsyscall page notes Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 14/24] Xen-paravirt_ops: Add XEN config options Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 15/24] Xen-paravirt_ops: Add Xen interface header files Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 16/24] Xen-paravirt_ops: Core Xen implementation Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 17/24] Xen-paravirt_ops: avoid having a bad selector in %gs during context switch Jeremy Fitzhardinge
2007-02-21 22:10 ` Andi Kleen
2007-02-21 22:10 ` Andi Kleen
2007-02-21 22:14 ` Jeremy Fitzhardinge
2007-02-21 22:14 ` Jeremy Fitzhardinge
2007-02-21 22:16 ` Keir Fraser
2007-02-21 22:16 ` Keir Fraser
2007-02-21 23:25 ` Zachary Amsden
2007-02-21 23:25 ` [Xen-devel] " Zachary Amsden
2007-02-21 23:29 ` Jeremy Fitzhardinge
2007-02-21 23:29 ` [Xen-devel] " Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 18/24] Xen-paravirt_ops: Some generic early printk & boot console fixups Jeremy Fitzhardinge
2007-02-22 3:10 ` Andrew Morton
2007-02-22 3:10 ` Andrew Morton
2007-02-22 5:48 ` Jeremy Fitzhardinge
2007-02-22 5:48 ` Jeremy Fitzhardinge
2007-02-22 8:33 ` Gerd Hoffmann
2007-02-21 20:53 ` [patch 19/24] Xen-paravirt_ops: Use the hvc console infrastructure for Xen console Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 20/24] Xen-paravirt_ops: Add early printk support via hvc console Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 21/24] Xen-paravirt_ops: Add Xen grant table support Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 22/24] Xen-paravirt_ops: Add the Xenbus sysfs and virtual device hotplug driver Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 23/24] Xen-paravirt_ops: Add Xen virtual block device driver Jeremy Fitzhardinge
2007-02-21 20:53 ` [patch 24/24] Xen-paravirt_ops: Add the Xen virtual network " Jeremy Fitzhardinge
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