linux-kernel - Re: [RFC tg_shares_up improvements - v1 01/12] sched: rewrite tg_shares

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Message-ID: <20101021080844.GB3581@in.ibm.com>
Date:	Thu, 21 Oct 2010 13:38:44 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	pjt@...gle.com
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Chris Friesen <cfriesen@...tel.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Pierre Bourdon <pbourdon@...ellency.fr>
Subject: Re: [RFC tg_shares_up improvements - v1 01/12] sched: rewrite
	tg_shares_up

On Fri, Oct 15, 2010 at 09:43:50PM -0700, pjt@...gle.com wrote:
> From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> --- kernel/sched_fair.c.orig
> +++ kernel/sched_fair.c
> @@ -417,7 +417,6 @@ int sched_proc_update_handler(struct ctl
>  	WRT_SYSCTL(sched_min_granularity);
>  	WRT_SYSCTL(sched_latency);
>  	WRT_SYSCTL(sched_wakeup_granularity);
> -	WRT_SYSCTL(sched_shares_ratelimit);
>  #undef WRT_SYSCTL
> 
>  	return 0;
> @@ -633,7 +632,6 @@ account_entity_enqueue(struct cfs_rq *cf
>  		list_add(&se->group_node, &cfs_rq->tasks);
>  	}
>  	cfs_rq->nr_running++;
> -	se->on_rq = 1;
>  }
> 
>  static void
> @@ -647,9 +645,89 @@ account_entity_dequeue(struct cfs_rq *cf
>  		list_del_init(&se->group_node);
>  	}
>  	cfs_rq->nr_running--;
> -	se->on_rq = 0;
>  }
> 
<snip>
> @@ -771,7 +849,9 @@ enqueue_entity(struct cfs_rq *cfs_rq, st
>  	 * Update run-time statistics of the 'current'.
>  	 */
>  	update_curr(cfs_rq);
> +	update_cfs_load(cfs_rq);
>  	account_entity_enqueue(cfs_rq, se);
> +	update_cfs_shares(cfs_rq_of(se));
> 
>  	if (flags & ENQUEUE_WAKEUP) {
>  		place_entity(cfs_rq, se, 0);
> @@ -782,6 +862,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, st
>  	check_spread(cfs_rq, se);
>  	if (se != cfs_rq->curr)
>  		__enqueue_entity(cfs_rq, se);
> +	se->on_rq = 1;
>  }
> 
>  static void __clear_buddies(struct cfs_rq *cfs_rq, struct sched_entity *se)
> @@ -825,8 +906,11 @@ dequeue_entity(struct cfs_rq *cfs_rq, st
> 
>  	if (se != cfs_rq->curr)
>  		__dequeue_entity(cfs_rq, se);
> +	se->on_rq = 0;

Since setting and un-setting of se->on_rq is completely handled within
sched_fair.c, we can remove the redundant setting and un-setting of
se->on_rq from sched.c:[en]dequeue_task. Even w/o this patch, they were
redundant I suppose.

Regards,
Bharata.
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