From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Jonathan Davies <jonathan.davies@citrix.com>
Cc: xen-devel@lists.xenproject.org,
Jon Ludlam <jonathan.ludlam@citrix.com>,
Dave Scott <dave@recoil.org>,
Euan Harris <euan.harris@citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH 0/7] oxenstored: improve transaction conflict handling
Date: Fri, 18 Mar 2016 10:33:35 -0400 [thread overview]
Message-ID: <20160318143335.GD27285@char.us.oracle.com> (raw)
In-Reply-To: <1458237075-13777-1-git-send-email-jonathan.davies@citrix.com>
On Thu, Mar 17, 2016 at 05:51:08PM +0000, Jonathan Davies wrote:
> This patch series makes a substantial improvement to oxenstored's transaction
> handling.
>
> The original design of oxenstored assumed that a transaction would only ever
> span a small subtree. In practice this is rarely the case and means that other
> xenstore traffic overlapping with a transaction can cause it to fail with
> EAGAIN. This leads to significant performance problems with toolstack operations
> when there is a certain level of xenstore traffic coming from other sources.
>
> Instead, we observe that, although the transaction may span a large subtree, it
> is very unlikely to read or write the same keys as other xenstore traffic. This
> observation leads to an improved transaction conflict-handling algorithm in
> which the transaction is replayed to check it is serializable. This approach is
> superior in performance.
>
> The sixth patch is the main one that changes the way transaction conflicts are
> handled. The first five patches prepare the way by performing some refactoring
> and addition of infrastructure that allows for transactions to be replayed. The
> seventh patch adds some extra logging.
All the patches have quite the Reviewed-by list already so I would think
these can go in now?
Thought oddly I didn't see any discussion on xen-devel for this?
>
> Jonathan Davies (7):
> oxenstored: refactor putting response on wire
> oxenstored: remove some unused parameters
> oxenstored: refactor request processing
> oxenstored: keep track of each transaction's operations
> oxenstored: move functions that process simple operations
> oxenstored: replay transaction upon conflict
> oxenstored: log request and response during transaction replay
>
> tools/ocaml/xenstored/Makefile | 1 +
> tools/ocaml/xenstored/connection.ml | 5 +-
> tools/ocaml/xenstored/define.ml | 1 +
> tools/ocaml/xenstored/oxenstored.conf | 1 +
> tools/ocaml/xenstored/process.ml | 344 +++++++++++++++++++++------------
> tools/ocaml/xenstored/transaction.ml | 21 +-
> tools/ocaml/xenstored/xenstored.ml | 1 +
> 7 files changed, 239 insertions(+), 135 deletions(-)
>
> --
> 1.7.10.4
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
next prev parent reply other threads:[~2016-03-18 14:33 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-17 17:51 [PATCH 0/7] oxenstored: improve transaction conflict handling Jonathan Davies
2016-03-17 17:51 ` [PATCH 1/7] oxenstored: refactor putting response on wire Jonathan Davies
2016-03-17 17:51 ` [PATCH 2/7] oxenstored: remove some unused parameters Jonathan Davies
2016-03-17 17:51 ` [PATCH 3/7] oxenstored: refactor request processing Jonathan Davies
2016-03-24 22:22 ` Boris Ostrovsky
2016-03-24 22:49 ` Andrew Cooper
2016-03-24 23:57 ` Boris Ostrovsky
2016-03-29 9:08 ` Jonathan Davies
2016-03-29 12:45 ` Boris Ostrovsky
2016-03-29 16:38 ` Wei Liu
2016-03-29 19:41 ` David Scott
2016-03-30 15:46 ` Jonathan Davies
2016-03-30 15:53 ` Wei Liu
2016-03-17 17:51 ` [PATCH 4/7] oxenstored: keep track of each transaction's operations Jonathan Davies
2016-03-17 17:51 ` [PATCH 5/7] oxenstored: move functions that process simple operations Jonathan Davies
2016-03-17 17:51 ` [PATCH 6/7] oxenstored: replay transaction upon conflict Jonathan Davies
2016-03-17 17:51 ` [PATCH 7/7] oxenstored: log request and response during transaction replay Jonathan Davies
2016-03-18 14:33 ` Konrad Rzeszutek Wilk [this message]
2016-03-18 16:21 ` [PATCH 0/7] oxenstored: improve transaction conflict handling Jonathan Davies
2016-03-18 16:36 ` Wei Liu
2016-03-19 11:30 ` David Scott
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=20160318143335.GD27285@char.us.oracle.com \
--to=konrad.wilk@oracle.com \
--cc=andrew.cooper3@citrix.com \
--cc=dave@recoil.org \
--cc=euan.harris@citrix.com \
--cc=jonathan.davies@citrix.com \
--cc=jonathan.ludlam@citrix.com \
--cc=xen-devel@lists.xenproject.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 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).