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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>
Subject: Re: [PATCH 02/16] xen: sched: add .init_pdata hook to the scheduler interface
Date: Tue, 22 Mar 2016 09:08:03 +0100	[thread overview]
Message-ID: <56F0FD63.9070801@suse.com> (raw)
In-Reply-To: <20160318190408.8117.13604.stgit@Solace.station>

On 18/03/16 20:04, Dario Faggioli wrote:
> with the purpose of decoupling the allocation phase and
> the initialization one, for per-pCPU data of the schedulers.
> 
> This makes it possible to perform the initialization later
> in the pCPU bringup/assignement process, when more information
> (for instance, the host CPU topology) are available. This,
> for now, is important only for Credit2, but it can well be
> useful to other schedulers.
> 
> Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
> ---
> Cc: George Dunlap <george.dunlap@eu.citrix.com>
> Cc: Juergen Gross <jgross@suse.com>
> ---
> Changes from v1:
>  * in schedule_cpu_switch(), call to init_pdata() moved up,
>    close to the call to alloc_pdata() (for consistency with
>    other call sites) and prototype slightly changed.
> ---
> During v1 review, it was agreed to add ASSERTS() and comments
> to clarify the use of schedule_cpu_switch(). This can't be
> found here, but only because it has happened in another patch.
> ---
>  xen/common/schedule.c      |    7 +++++++
>  xen/include/xen/sched-if.h |    1 +
>  2 files changed, 8 insertions(+)
> 
> diff --git a/xen/common/schedule.c b/xen/common/schedule.c
> index e57b659..0627eb5 100644
> --- a/xen/common/schedule.c
> +++ b/xen/common/schedule.c
> @@ -1517,10 +1517,15 @@ static int cpu_schedule_callback(
>      struct notifier_block *nfb, unsigned long action, void *hcpu)
>  {
>      unsigned int cpu = (unsigned long)hcpu;
> +    struct scheduler *sched = per_cpu(scheduler, cpu);
> +    struct schedule_data *sd = &per_cpu(schedule_data, cpu);
>      int rc = 0;
>  
>      switch ( action )
>      {
> +    case CPU_STARTING:
> +        SCHED_OP(sched, init_pdata, sd->sched_priv, cpu);
> +        break;
>      case CPU_UP_PREPARE:
>          rc = cpu_schedule_up(cpu);
>          break;
> @@ -1597,6 +1602,7 @@ void __init scheduler_init(void)
>      if ( ops.alloc_pdata &&
>           !(this_cpu(schedule_data).sched_priv = ops.alloc_pdata(&ops, 0)) )
>          BUG();
> +    SCHED_OP(&ops, init_pdata, this_cpu(schedule_data).sched_priv, 0);

Aah, here is the init_pdata call I missed in patch 3. Sorry for the
noise.

>  }
>  
>  /*
> @@ -1640,6 +1646,7 @@ int schedule_cpu_switch(unsigned int cpu, struct cpupool *c)
>      ppriv = SCHED_OP(new_ops, alloc_pdata, cpu);
>      if ( ppriv == NULL )
>          return -ENOMEM;
> +    SCHED_OP(new_ops, init_pdata, ppriv, cpu);
>      vpriv = SCHED_OP(new_ops, alloc_vdata, idle, idle->domain->sched_priv);
>      if ( vpriv == NULL )
>      {
> diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h
> index 825f1ad..70c08c6 100644
> --- a/xen/include/xen/sched-if.h
> +++ b/xen/include/xen/sched-if.h
> @@ -133,6 +133,7 @@ struct scheduler {
>                                      void *);
>      void         (*free_pdata)     (const struct scheduler *, void *, int);
>      void *       (*alloc_pdata)    (const struct scheduler *, int);
> +    void         (*init_pdata)     (const struct scheduler *, void *, int);
>      void         (*free_domdata)   (const struct scheduler *, void *);
>      void *       (*alloc_domdata)  (const struct scheduler *, struct domain *);

Reviewed-by: Juergen Gross <jgross@suse.com>


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  reply	other threads:[~2016-03-22  8:08 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-18 19:03 [PATCH 00/16] Fixes and improvement (including hard affinity!) for Credit2 Dario Faggioli
2016-03-18 19:04 ` [PATCH 01/16] xen: sched: fix locking when allocating an RTDS pCPU Dario Faggioli
2016-03-19  2:22   ` Meng Xu
2016-03-23 15:37   ` George Dunlap
2016-03-18 19:04 ` [PATCH 02/16] xen: sched: add .init_pdata hook to the scheduler interface Dario Faggioli
2016-03-22  8:08   ` Juergen Gross [this message]
2016-03-23 17:32   ` George Dunlap
2016-03-18 19:04 ` [PATCH 03/16] xen: sched: make implementing .alloc_pdata optional Dario Faggioli
2016-03-19  2:23   ` Meng Xu
2016-03-21 14:22   ` Jan Beulich
2016-03-23 17:36     ` George Dunlap
2016-03-24  9:43       ` Jan Beulich
2016-03-24 13:14         ` Dario Faggioli
2016-03-21 14:48   ` Juergen Gross
2016-03-21 15:07     ` Jan Beulich
2016-04-01 17:01       ` Dario Faggioli
2016-04-04  4:21         ` Juergen Gross
2016-04-04  6:13         ` Jan Beulich
2016-04-05 16:01           ` Dario Faggioli
2016-03-23 17:38   ` George Dunlap
2016-03-18 19:04 ` [PATCH 04/16] xen: sched: implement .init_pdata in all schedulers Dario Faggioli
2016-03-19  2:24   ` Meng Xu
2016-03-22  8:03   ` Juergen Gross
2016-03-23 17:46     ` George Dunlap
2016-03-18 19:04 ` [PATCH 05/16] xen: sched: move pCPU initialization in an helper Dario Faggioli
2016-03-23 17:51   ` George Dunlap
2016-03-23 18:09     ` George Dunlap
2016-03-24 13:21     ` Dario Faggioli
2016-03-18 19:04 ` [PATCH 06/16] xen: sched: prepare a .switch_sched hook for Credit1 Dario Faggioli
2016-03-18 19:04 ` [PATCH 07/16] xen: sched: prepare a .switch_sched hook for Credit2 Dario Faggioli
2016-03-18 19:04 ` [PATCH 08/16] " Dario Faggioli
2016-03-19  2:24   ` Meng Xu
2016-03-21 14:25   ` Jan Beulich
2016-03-18 19:05 ` [PATCH 09/16] xen: sched: close potential races when switching scheduler to CPUs Dario Faggioli
2016-03-19  2:25   ` Meng Xu
2016-03-23 19:05   ` George Dunlap
2016-04-05 16:26     ` Dario Faggioli
2016-04-06 15:51       ` Dario Faggioli
2016-03-24 12:14   ` George Dunlap
2016-04-05 17:37     ` Dario Faggioli
2016-04-06 16:21       ` Dario Faggioli
2016-03-18 19:05 ` [PATCH 10/16] xen: sched: improve credit2 bootparams' scope, placement and signedness Dario Faggioli
2016-03-21 14:51   ` Juergen Gross
2016-03-24 12:20   ` George Dunlap
2016-03-18 19:05 ` [PATCH 11/16] xen: sched: on Credit2, don't reprogram the timer if idle Dario Faggioli
2016-03-24 15:03   ` George Dunlap
2016-03-18 19:05 ` [PATCH 12/16] xen: sched: fix per-socket runqueue creation in credit2 Dario Faggioli
2016-03-24 12:24   ` George Dunlap
2016-03-18 19:05 ` [PATCH 13/16] xen: sched: allow for choosing credit2 runqueues configuration at boot Dario Faggioli
2016-03-22  7:46   ` Juergen Gross
2016-03-24 12:36   ` George Dunlap
2016-03-18 19:05 ` [PATCH 14/16] xen: sched: per-core runqueues as default in credit2 Dario Faggioli
2016-03-24 12:37   ` George Dunlap
2016-03-18 19:06 ` [PATCH 15/16] xen: sched: scratch space for cpumasks on Credit2 Dario Faggioli
2016-03-18 19:27   ` Andrew Cooper
2016-03-24 12:44     ` George Dunlap
2016-03-24 12:56       ` Andrew Cooper
2016-03-24 13:10       ` Dario Faggioli
2016-03-18 19:06 ` [PATCH 16/16] xen: sched: implement vcpu hard affinity in Credit2 Dario Faggioli
2016-03-24 15:42   ` George Dunlap
2016-04-05 16:50     ` Dario Faggioli

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