From: Keir Fraser <keir@xen.org>
To: Olaf Hering <olaf@aepfle.de>
Cc: xen-devel@lists.xensource.com
Subject: Re: [PATCH 12/17] xenpaging: handle HVMCOPY_gfn_paged_out in copy_from/to_user
Date: Wed, 15 Dec 2010 14:08:32 +0000 [thread overview]
Message-ID: <C92E7C60.294CD%keir@xen.org> (raw)
In-Reply-To: <20101215135140.GA4236@aepfle.de>
On 15/12/2010 13:51, "Olaf Hering" <olaf@aepfle.de> wrote:
>> I think the condition you wait on should be for a response to your paging
>> request. A wake_up() alone is not really sufficient; you need some kind of
>> explicit flagging to the vcpu too. Could the paging daemon stick a response
>> in a shared ring, or otherwise explicitly flag to this vcpu that it's
>> request has been fully satisfied and it's time to wake up and retry its
>> operation? Well, really that's a rhetorical question, because that is
>> exactly what you need to implement for this waitqueue strategy to work
>> properly!
>
> Yes, there needs to be some reliable event which the vcpu has to pick up.
> I will return to work on this issue, but most likely not this year anymore.
This is all bugfix stuff which can be slipped into 4.1 during feature
freeze. Also, what doesn't get done in time for 4.1.0 can go into 4.1.1
instead, which will likely be 6-8 weeks later.
-- Keir
next prev parent reply other threads:[~2010-12-15 14:08 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-06 20:59 [PATCH 00/17] xenpaging changes for xen-unstable Olaf Hering
2010-12-06 20:59 ` [PATCH 01/17] xenpaging: close xch handle in xenpaging_init error path Olaf Hering
2010-12-14 18:52 ` Ian Jackson
2010-12-06 20:59 ` [PATCH 02/17] xenpaging: remove perror usage " Olaf Hering
2010-12-06 20:59 ` [PATCH 03/17] xenpaging: print DPRINTF ouput if XENPAGING_DEBUG is in environment Olaf Hering
2010-12-06 20:59 ` [PATCH 04/17] xenpaging: print number of evicted pages Olaf Hering
2010-12-06 20:59 ` [PATCH 05/17] xenpaging: remove duplicate xc_interface_close call Olaf Hering
2010-12-06 20:59 ` [PATCH 06/17] xenpaging: do not use DPRINTF/ERROR if xch handle is unavailable Olaf Hering
2010-12-06 20:59 ` [PATCH 07/17] xenpaging: update xch usage Olaf Hering
2010-12-06 20:59 ` [PATCH 08/17] xenpaging: make vcpu_sleep_nosync() optional in mem_event_check_ring() Olaf Hering
2010-12-06 20:59 ` [PATCH 09/17] xenpaging: update machine_to_phys_mapping[] during page deallocation Olaf Hering
2010-12-06 20:59 ` [PATCH 10/17] xenpaging: update machine_to_phys_mapping[] during page-in Olaf Hering
2010-12-14 22:58 ` Olaf Hering
2010-12-15 10:47 ` Tim Deegan
2010-12-06 20:59 ` [PATCH 11/17] xenpaging: drop paged pages in guest_remove_page Olaf Hering
2010-12-06 20:59 ` [PATCH 12/17] xenpaging: handle HVMCOPY_gfn_paged_out in copy_from/to_user Olaf Hering
2010-12-07 9:27 ` Jan Beulich
2010-12-07 9:45 ` Olaf Hering
2010-12-15 11:35 ` Keir Fraser
2010-12-15 13:51 ` Olaf Hering
2010-12-15 14:08 ` Keir Fraser [this message]
2010-12-06 20:59 ` [PATCH 13/17] xenpaging: page only pagetables for debugging Olaf Hering
2010-12-06 20:59 ` [PATCH 14/17] xenpaging: prevent page-out of first 16MB Olaf Hering
2010-12-06 20:59 ` [PATCH 15/17] xenpaging: start xenpaging via config option Olaf Hering
2010-12-06 20:59 ` [PATCH 16/17] xenpaging: add dynamic startup delay for xenpaging Olaf Hering
2010-12-06 20:59 ` [PATCH 17/17] xenpaging: (sparse) documenation Olaf Hering
2010-12-06 21:16 ` [PATCH 00/17] xenpaging changes for xen-unstable Olaf Hering
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