From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dario Faggioli Subject: Re: [RFC PATCH 0/4] Repurpose SEDF Scheduler for Real-time use Date: Mon, 16 Jun 2014 09:25:08 +0200 Message-ID: <1402903508.2352.16.camel@Solace> References: <1402689488-3577-1-git-send-email-josh.whitehead@dornerworks.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============4577607993694156126==" Return-path: In-Reply-To: <1402689488-3577-1-git-send-email-josh.whitehead@dornerworks.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Josh Whitehead Cc: Ian Campbell , Stefano Stabellini , George Dunlap , Ian Jackson , Robert VanVossen , Xen-devel , Nate Studer List-Id: xen-devel@lists.xenproject.org --===============4577607993694156126== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-yVipyKP1yyDis2U5cqVK" --=-yVipyKP1yyDis2U5cqVK Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Josh and Robbie (and everyone), On ven, 2014-06-13 at 15:58 -0400, Josh Whitehead wrote: > NEED: > With the increased interest in embedded Xen, there is a need for a suitab= le > real-time scheduler. The arinc653 scheduler currently only supports a > single core and has limited niche appeal, while the sedf scheduler is > widely consider deprecated and is currently a mess. This patchset > repurposes the current sedf scheduler and adds a more capable and robust= =20 > real-time scheduler suitable for embedded use to the Xen repertoire. >=20 Indeed! And in fact, thanks a lot for this work. I'll have a look at the patches ASAP, and will let you know what I think of them. > PROPOSED SOLUTION: > Repurposing of the sedf scheduler was accomplished by implementing the > Constant Bandwidth Server (CBS) algorithm (originally proposed by Dario > Faggioli) which is capable of properly handling mixed soft real-time and > hard real-time tasks (domains/vcpus) on the same system. >=20 Well, I did a lot of work _on_top_of_ CBS during Ph.D on RT systems, but the algorithm itself is not my invention! :-P I certainly was the one that originally proposed to use it in Xen, inside (or in spite of, if you want) SEDF, though. :-) Anyway, thanks again, I'll let you have my comments on the patches. Regards, Dario --=20 <> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) --=-yVipyKP1yyDis2U5cqVK Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iEYEABECAAYFAlOem9UACgkQk4XaBE3IOsTsAACeMY0WxPP9TIgUbFDxZwckHWLM Ap4AoJlVX/9SPi/Mh+1Dvk/vH5OtUl/e =fUdJ -----END PGP SIGNATURE----- --=-yVipyKP1yyDis2U5cqVK-- --===============4577607993694156126== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel --===============4577607993694156126==--