From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dario Faggioli Subject: Re: Question regarding Xen scheduler Date: Fri, 24 Oct 2014 16:55:42 +0200 Message-ID: <1414162542.17454.45.camel@Abyss> References: <543542AE.9060607@citrix.com> <5437B0FD020000780003D882@mail.emea.novell.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============4471446863948503325==" Return-path: In-Reply-To: <5437B0FD020000780003D882@mail.emea.novell.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: Jan Beulich Cc: Andrew Cooper , Kelly Zytaruk , "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org --===============4471446863948503325== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-62CPIbPXB9RNeDVylpVc" --=-62CPIbPXB9RNeDVylpVc Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2014-10-10 at 09:12 +0100, Jan Beulich wrote: > >>> On 08.10.14 at 15:57, wrote: > > On 08/10/14 14:05, Zytaruk, Kelly wrote: > >> What if I am doing something time critical or sequence critical that c= an't=20 > > be interrupted? Is there a way to tell the Xen scheduler that "I am in= a=20 > > critical section and can't be interrupted by another Dom" so that Xen w= on't=20 > > task switch until I am done? > >=20 > > No. >=20 > But I'd like to note that suggestions to add some mechanism to > allow this have been made more than once in the past. >=20 And it does seems sensible, as a mechanism, at least IMO. However, the problem, as often in scheduling, especially when dealing with a complex architecture, such as Xen's one, would be how to use it "right"... Assuming we even know what "right" means in this case. In fact, this is the typical thing that can bring a lot of benefits in one situation/workload, and at the same time disrupt substantially another one! :-/ For instance, Kelly, if I can ask, how where you thinking to use it, if it were there? Regards, Dario --=20 <> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) --=-62CPIbPXB9RNeDVylpVc 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 iEYEABECAAYFAlRKaG4ACgkQk4XaBE3IOsQL1QCeJ9l/R2hxQQrPvnD6dSP+uVxM 05sAoIVIOVY41M48+jPYV5FSZKHxi3Wj =jsxx -----END PGP SIGNATURE----- --=-62CPIbPXB9RNeDVylpVc-- --===============4471446863948503325== 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 --===============4471446863948503325==--