From: Zachary Amsden <zach@vmware.com>
To: Benjamin LaHaise <bcrl@kvack.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, Andi Kleen <ak@muc.de>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, virtualization@lists.osdl.org,
xen-devel@lists.xensource.com, Chris Wright <chrisw@sous-sol.org>,
Rusty Russell <rusty@rustcorp.com.au>,
Ingo Molnar <mingo@redhat.com>, Andi Kleen <ak@suse.de>
Subject: Re: [patch 28/34] Xen-pv_ops: Xen SMP guest support
Date: Wed, 14 Mar 2007 12:23:43 -0800 [thread overview]
Message-ID: <45F859CF.8040100@vmware.com> (raw)
In-Reply-To: <20070314132820.GL6209@kvack.org>
Benjamin LaHaise wrote:
>
>> +/*
>> + * We aggressively remove defunct pgd from cr3. We execute unmap_vmas()
>> + * *much* faster this way.
>> + */
>>
>
> Are you switching mms in order to avoid all of the overhead associated with
> flushing an active mm during task exit? If so, it makes much more sense to
> do this in the generic helper, as it should be a win on x86 and x86-64
> where switching to init_mm is relatively low cost given the support for
> global pages. I'll run some tests on a couple of systems this evening and
> post the results.
>
I tried this experiment on both x86 and x86-64 and I recall not seeing
any effect. The mmu_gather optimization does most of this already.
Zach
next prev parent reply other threads:[~2007-03-14 20:23 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-13 23:30 [patch 00/34] Xen-pv_ops: Xen guest implementation for paravirt_ops interface Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 01/34] Xen-pv_ops: Fix typo in sync_constant_test_bit()s name Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 02/34] Xen-pv_ops: ignore vgacon if hardware not present Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 03/34] Xen-pv_ops: update MAINTAINERS Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 04/34] Xen-pv_ops: use paravirt_nop to consistently mark no-op operations Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 05/34] Xen-pv_ops: Add pagetable accessors to pack and unpack pagetable entries Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 06/34] Xen-pv_ops: Hooks to set up initial pagetable Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 07/34] Xen-pv_ops: Allocate a fixmap slot Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 08/34] Xen-pv_ops: Allow paravirt backend to choose kernel PMD sharing Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 09/34] Xen-pv_ops: add hooks to intercept mm creation and destruction Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 10/34] Xen-pv_ops: Simplify smp_call_function*() by using common implementation Jeremy Fitzhardinge
2007-03-16 2:38 ` Randy Dunlap
2007-03-13 23:30 ` [patch 11/34] Xen-pv_ops: Add smp_ops interface Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 12/34] Xen-pv_ops: rename struct paravirt_patch to paravirt_patch_site for clarity Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 13/34] Xen-pv_ops: Use patch site IDs computed from offset in paravirt_ops structure Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 14/34] Xen-pv_ops: Fix patch site clobbers to include return register Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 15/34] Xen-pv_ops: Consistently wrap paravirt ops callsites to make them patchable Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 16/34] Xen-pv_ops: add common patching machinery Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 17/34] Xen-pv_ops: add flush_tlb_others paravirt_op Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 18/34] Xen-pv_ops: revert map_pt_hook Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 19/34] Xen-pv_ops: add kmap_atomic_pte for mapping highpte pages Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 20/34] Xen-pv_ops: Add apply_to_page_range() which applies a function to a pte range Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 21/34] Xen-pv_ops: Allocate and free vmalloc areas Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 22/34] Xen-pv_ops: Add nosegneg capability to the vsyscall page notes Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 23/34] Xen-pv_ops: Add XEN config options Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 24/34] Xen-pv_ops: Add Xen interface header files Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 25/34] Xen-pv_ops: Core Xen implementation Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 26/34] Xen-pv_ops: Complete pagetable pinning for Xen Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 27/34] Xen-pv_ops: Implement Xen clockevent device Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 28/34] Xen-pv_ops: Xen SMP guest support Jeremy Fitzhardinge
2007-03-14 13:28 ` Benjamin LaHaise
2007-03-14 15:05 ` Jeremy Fitzhardinge
2007-03-14 20:23 ` Zachary Amsden [this message]
2007-03-13 23:30 ` [patch 29/34] Xen-pv_ops: Use the hvc console infrastructure for Xen console Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 30/34] Xen-pv_ops: Add early printk support via hvc console Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 31/34] Xen-pv_ops: Add Xen grant table support Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 32/34] Xen-pv_ops: Add the Xenbus sysfs and virtual device hotplug driver Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 33/34] Xen-pv_ops: Add Xen virtual block device driver Jeremy Fitzhardinge
2007-03-13 23:30 ` [patch 34/34] Xen-pv_ops: Add the Xen virtual network " Jeremy Fitzhardinge
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