linux-kernel - Re: [PATCH 2/3] sched: terminate newidle balancing once at least one task has moved over

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Message-Id: <48732751.BA47.005A.0@novell.com>
Date:	Tue, 08 Jul 2008 06:37:37 -0600
From:	"Gregory Haskins" <ghaskins@...ell.com>
To:	"Nick Piggin" <nickpiggin@...oo.com.au>
Cc:	<mingo@...e.hu>, <rostedt@...dmis.org>, <peterz@...radead.org>,
	<npiggin@...e.de>, <linux-kernel@...r.kernel.org>,
	<linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH 2/3] sched: terminate newidle balancing once at
	least one task has moved over

>>> On Tue, Jul 8, 2008 at  1:00 AM, in message
<200807081500.18245.nickpiggin@...oo.com.au>, Nick Piggin
<nickpiggin@...oo.com.au> wrote: 
> On Saturday 28 June 2008 06:29, Gregory Haskins wrote:
>> Inspired by Peter Zijlstra.
>>
>> Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
> 
> What happened to the feedback I sent about this?
> 
> It is still nack from me.

Ah yes.  Slipped through the cracks...sorry about that.

What if we did "if (idle == CPU_NEWLY_IDLE && need_resched())" instead?

-Greg

> 
> 
>> ---
>>
>>  kernel/sched.c |    4 ++++
>>  1 files changed, 4 insertions(+), 0 deletions(-)
>>
>> diff --git a/kernel/sched.c b/kernel/sched.c
>> index 56722b1..0b9f90e 100644
>> --- a/kernel/sched.c
>> +++ b/kernel/sched.c
>> @@ -2863,6 +2863,10 @@ static int move_tasks(struct rq *this_rq, int
>> this_cpu, struct rq *busiest, max_load_move - total_load_moved,
>>  				sd, idle, all_pinned, &this_best_prio);
>>  		class = class->next;
>> +
>> +		if (idle == CPU_NEWLY_IDLE && this_rq->nr_running)
>> +			break;
>> +
>>  	} while (class && max_load_move > total_load_moved);
>>
>>  	return total_load_moved > 0;
>>
>> --



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