From: Tim Deegan <tim@xen.org>
To: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Ian Campbell <Ian.Campbell@citrix.com>,
"konrad.wilk@oracle.com" <konrad.wilk@oracle.com>,
Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
Subject: Re: [PATCH] libvchan: interdomain communications library
Date: Thu, 25 Aug 2011 11:27:38 +0100 [thread overview]
Message-ID: <20110825102738.GA79827@ocelot.phlegethon.org> (raw)
In-Reply-To: <4E554884.1040109@tycho.nsa.gov>
At 14:52 -0400 on 24 Aug (1314197572), Daniel De Graaf wrote:
> Agreed, barriers are needed for a robust implementation. Since this is
> a shared library and not xen or kernel code, the existing barrier()/wmb()
> functions are not available. The only existing implementations in Xen
> appear to expand to asm("":::"memory") which does not actually implement
> a memory barrier (i.e. MFENCE or similar opcodes).
AIUI on x86_64, writes are guaranteed to be seen in order so the only
thing that barrier has to protect against is the compiler reordering the
writes.
Tim.
--
Tim Deegan <tim@xen.org>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd. (Company #02937203, SL9 0BG)
next prev parent reply other threads:[~2011-08-25 10:27 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-19 14:38 [PATCH] libvchan: interdomain communications library Daniel De Graaf
2011-08-22 7:40 ` Vasiliy G Tolstov
2011-08-24 19:28 ` Konrad Rzeszutek Wilk
2011-08-22 9:15 ` Ian Campbell
2011-08-24 18:52 ` Daniel De Graaf
2011-08-25 10:27 ` Tim Deegan [this message]
2011-08-25 18:36 ` Jeremy Fitzhardinge
2011-08-24 18:52 ` [PATCH v2] " Daniel De Graaf
2011-08-26 14:01 ` Ian Jackson
2011-08-29 18:48 ` [PATCH v3] " Daniel De Graaf
2011-08-30 10:32 ` Ian Campbell
2011-08-31 19:17 ` Daniel De Graaf
2011-09-01 16:28 ` Ian Campbell
2011-09-01 16:47 ` Daniel De Graaf
2011-09-01 16:56 ` Ian Jackson
2011-09-01 17:46 ` Daniel De Graaf
2011-09-01 16:22 ` [PATCH v4 0/3] " Daniel De Graaf
2011-09-01 16:22 ` [PATCH 1/3] libxc: add xc_gnttab_map_grant_ref_notify Daniel De Graaf
2011-09-01 19:29 ` Konrad Rzeszutek Wilk
2011-09-01 16:22 ` [PATCH 2/3] libxc: add xc_gntshr_* functions Daniel De Graaf
2011-09-01 19:24 ` Konrad Rzeszutek Wilk
2011-09-01 16:22 ` [PATCH 3/3] libvchan: interdomain communications library Daniel De Graaf
2011-09-19 22:43 ` [PATCH v5 0/3] Daniel De Graaf
2011-09-19 22:43 ` [PATCH 1/3] libxc: add xc_gnttab_map_grant_ref_notify Daniel De Graaf
2011-09-21 10:03 ` Ian Campbell
2011-09-21 15:02 ` Daniel De Graaf
2011-09-21 15:25 ` Ian Campbell
2011-09-21 17:07 ` Daniel De Graaf
2011-09-22 8:32 ` Ian Campbell
2011-09-22 18:09 ` Daniel De Graaf
2011-09-19 22:43 ` [PATCH 2/3] libxc: add xc_gntshr_* functions Daniel De Graaf
2011-09-21 10:13 ` Ian Campbell
2011-09-19 22:43 ` [PATCH 3/3] libvchan: interdomain communications library Daniel De Graaf
2011-09-21 10:53 ` Ian Campbell
2011-09-21 16:31 ` Daniel De Graaf
2011-09-22 8:18 ` Ian Campbell
2011-09-21 13:44 ` Ian Campbell
2011-09-22 22:14 ` [PATCH v6 0/3] libxenvchan: " Daniel De Graaf
2011-09-22 22:14 ` [PATCH 1/3] libxc: add xc_gnttab_map_grant_ref_notify Daniel De Graaf
2011-09-30 9:16 ` Ian Campbell
2011-09-30 14:12 ` Ian Jackson
2011-09-30 14:17 ` Ian Campbell
2011-09-22 22:14 ` [PATCH 2/3] libxc: add xc_gntshr_* functions Daniel De Graaf
2011-09-22 22:14 ` [PATCH 3/3] libvchan: interdomain communications library Daniel De Graaf
2011-09-30 7:51 ` [PATCH v6 0/3] libxenvchan: " Vasiliy Tolstov
2011-09-30 8:28 ` Vasiliy Tolstov
2011-09-30 14:40 ` Daniel De Graaf
2011-11-24 20:02 ` Anil Madhavapeddy
2011-11-25 16:53 ` Daniel De Graaf
2011-11-25 16:54 ` [PATCH] libxc: Fix checks on grant notify arguments Daniel De Graaf
2011-12-01 18:20 ` Ian Jackson
2011-11-25 16:56 ` [PATCH 1/2] xen/events: prevent calling evtchn_get on invlaid channels Daniel De Graaf
2011-11-25 16:56 ` [PATCH 2/2] xen/gntalloc: release grant references on page free Daniel De Graaf
2011-11-25 18:37 ` [PATCH] xen/gntalloc: fix reference counts on multi-page mappings Daniel De Graaf
2011-09-30 8:34 ` [PATCH v6 0/3] libxenvchan: interdomain communications library Ian Campbell
2011-09-30 8:37 ` [PATCH] libxc: osdep: report missing backends in common code Ian Campbell
2011-10-06 18:44 ` [PATCH v6 0/3] libxenvchan: interdomain communications library Ian Jackson
2011-10-07 8:41 ` Roger Pau Monné
2011-10-07 9:15 ` Keir Fraser
2011-10-07 9:48 ` Ian Jackson
2011-10-07 10:22 ` Roger Pau Monné
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=20110825102738.GA79827@ocelot.phlegethon.org \
--to=tim@xen.org \
--cc=Ian.Campbell@citrix.com \
--cc=Stefano.Stabellini@eu.citrix.com \
--cc=dgdegra@tycho.nsa.gov \
--cc=konrad.wilk@oracle.com \
--cc=xen-devel@lists.xensource.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).