From: David Vrabel <david.vrabel@citrix.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Keir Fraser <keir@xen.org>,
David Vrabel <david.vrabel@citrix.com>,
Jan Beulich <jbeulich@suse.com>,
xen-devel@lists.xen.org
Subject: Re: [PATCH 3/3] evtchn/fifo: don't spin indefinitely when setting LINK
Date: Wed, 6 Nov 2013 15:07:14 +0000 [thread overview]
Message-ID: <527A5B22.5040503@citrix.com> (raw)
In-Reply-To: <527A59E1.7070002@oracle.com>
On 06/11/13 15:01, Boris Ostrovsky wrote:
> On 11/06/2013 08:38 AM, David Vrabel wrote:
>>
>> Given the non-obvious locking required for this to be safe and the
>> overhead of the guest having to do a unmask hypercall more often. I
>> think I will fix this differently.
>>
>> A new BUSY bit is added to the event word. Xen sets BUSY prior to
>> updating the LINK field and then clears it when the LINK field is set.
>>
>> When the guest unmasks an event it must spin waiting for BUSY to clear
>> before it clears the MASKED bit. It then need only do the unmask
>> hypercall if the event is pending (as before).
>>
>> Draft H and v3 of this series to follow.
>
> Will there be a new Linux series as well?
Yes, but only the final patch in the series will change.
David
next prev parent reply other threads:[~2013-11-06 15:07 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-31 15:03 [PATCHv2 0/3] Xen: FIFO-based event channel ABI fixes David Vrabel
2013-10-31 15:03 ` [PATCH 1/3] MAINTAINERS: Add FIFO-based event channel ABI maintainer David Vrabel
2013-11-04 14:29 ` Jan Beulich
2013-11-05 21:06 ` Keir Fraser
2013-11-06 11:49 ` David Vrabel
2013-11-06 12:40 ` Jan Beulich
2013-10-31 15:03 ` [PATCH 2/3] evtchn: don't lose pending state if FIFO event array page is missing David Vrabel
2013-11-04 14:29 ` Jan Beulich
2013-11-05 21:07 ` Keir Fraser
2013-10-31 15:03 ` [PATCH 3/3] evtchn/fifo: don't spin indefinitely when setting LINK David Vrabel
2013-10-31 18:13 ` Boris Ostrovsky
2013-11-04 14:39 ` Jan Beulich
2013-11-04 14:52 ` David Vrabel
2013-11-04 14:57 ` Jan Beulich
2013-11-04 16:30 ` David Vrabel
2013-11-05 14:18 ` Jan Beulich
2013-11-04 15:07 ` Ian Campbell
2013-11-04 15:11 ` David Vrabel
2013-11-05 14:19 ` Jan Beulich
2013-11-05 14:25 ` Jan Beulich
2013-11-06 13:38 ` David Vrabel
2013-11-06 15:01 ` Boris Ostrovsky
2013-11-06 15:07 ` David Vrabel [this message]
2013-11-10 21:21 ` Matt Wilson
2013-10-31 15:13 ` [PATCHv2 0/3] Xen: FIFO-based event channel ABI fixes David Vrabel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=527A5B22.5040503@citrix.com \
--to=david.vrabel@citrix.com \
--cc=boris.ostrovsky@oracle.com \
--cc=jbeulich@suse.com \
--cc=keir@xen.org \
--cc=xen-devel@lists.xen.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.