From: Juergen Gross <jgross@suse.com>
To: Dario Faggioli <dario.faggioli@citrix.com>,
xen-devel@lists.xenproject.org
Cc: George Dunlap <george.dunlap@eu.citrix.com>,
Jan Beulich <JBeulich@suse.com>,
Josh Whitehead <josh.whitehead@dornerworks.com>,
Meng Xu <mengxu@cis.upenn.edu>,
Robert VanVossen <robert.vanvossen@dornerworks.com>
Subject: Re: [PATCH v2 01/11] xen: sched: make implementing .alloc_pdata optional
Date: Thu, 7 Apr 2016 06:56:16 +0200 [thread overview]
Message-ID: <5705E870.30502@suse.com> (raw)
In-Reply-To: <20160406172242.25877.3097.stgit@Solace.fritz.box>
On 06/04/16 19:22, Dario Faggioli wrote:
> The .alloc_pdata scheduler hook must, before this change,
> be implemented by all schedulers --even those ones that
> don't need to allocate anything.
>
> Make it possible to just use the SCHED_OP(), like for
> the other hooks, by using ERR_PTR() and IS_ERR() for
> error reporting. This:
> - makes NULL a variant of success;
> - allows for errors other than ENOMEM to be properly
> communicated (if ever necessary).
>
> This, in turn, means that schedulers not needing to
> allocate any per-pCPU data, can avoid implementing the
> hook. In fact, the artificial implementation of
> .alloc_pdata in the ARINC653 is removed (and, while there,
> nuke .free_pdata too, as it is equally useless).
>
> Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
> Reviewed-by: Meng Xu <mengxu@cis.upenn.edu>
Reviewed-by: Juergen Gross <jgross@suse.com>
Juergen
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next prev parent reply other threads:[~2016-04-07 4:56 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-06 17:22 [PATCH v2 00/11] Fixes and improvement (including hard affinity!) for Credit2 Dario Faggioli
2016-04-06 17:22 ` [PATCH v2 01/11] xen: sched: make implementing .alloc_pdata optional Dario Faggioli
2016-04-07 4:56 ` Juergen Gross [this message]
2016-04-07 11:24 ` George Dunlap
2016-04-06 17:22 ` [PATCH v2 02/11] xen: sched: implement .init_pdata in Credit, Credit2 and RTDS Dario Faggioli
2016-04-06 17:23 ` [PATCH v2 03/11] xen: sched: move pCPU initialization in an helper Dario Faggioli
2016-04-06 17:23 ` [PATCH v2 04/11] xen: sched: close potential races when switching scheduler to CPUs Dario Faggioli
2016-04-07 14:54 ` George Dunlap
2016-04-07 23:48 ` Dario Faggioli
2016-04-06 17:23 ` [PATCH v2 05/11] xen: sched: improve credit2 bootparams' scope, placement and signedness Dario Faggioli
2016-04-06 17:23 ` [PATCH v2 06/11] xen: sched: on Credit2, don't reprogram the timer if idle Dario Faggioli
2016-04-06 17:23 ` [PATCH v2 07/11] xen: sched: fix per-socket runqueue creation in credit2 Dario Faggioli
2016-04-06 17:23 ` [PATCH v2 08/11] xen: sched: allow for choosing credit2 runqueues configuration at boot Dario Faggioli
2016-04-07 5:04 ` Juergen Gross
2016-04-07 15:04 ` George Dunlap
2016-04-07 22:45 ` Dario Faggioli
2016-04-06 17:23 ` [PATCH v2 09/11] xen: sched: per-core runqueues as default in credit2 Dario Faggioli
2016-04-06 17:24 ` [PATCH v2 10/11] xen: sched: privde some scratch space for not putting cpumasks on stack Dario Faggioli
2016-04-07 15:12 ` George Dunlap
2016-04-06 17:24 ` [PATCH v2 11/11] xen: sched: implement vcpu hard affinity in Credit2 Dario Faggioli
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