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Subject: Re: [RFC][PATCH 6/7] sched: Balance RT tasks when forked as well
From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
        Andrew Morton <akpm@linux-foundation.org>
In-Reply-To: <20110617015919.832743148@goodmis.org>
References: <20110617015516.301117218@goodmis.org>
	 <20110617015919.832743148@goodmis.org>
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Date: Tue, 26 Jul 2011 14:25:08 +0200
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On Thu, 2011-06-16 at 21:55 -0400, Steven Rostedt wrote:
> +       /* For anything but wake ups, just return the task_cpu */
> +       if (sd_flag != SD_BALANCE_WAKE || sd_flag != SD_BALANCE_FORK) 

So we call select_task_rq() with SD_BALANCE_{WAKE,EXEC,FORK}, 

	(WAKE != WAKE -> 0 || WAKE != FORK -> 1) -> 1
	(EXEC != WAKE -> 1 ) -> 1
	(FORK != WAKE -> 1 ) -> 1

IOW, you never end up doing anything now.. surely you didn't mean that?!