linux-kernel - Re: [PATCH] sched: Reduce overhead in balance

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Date:	Fri, 24 Aug 2007 08:04:03 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Williams <pwil3058@...pond.net.au>
Cc:	Nick Piggin <npiggin@...e.de>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: Reduce overhead in balance_tasks()


* Peter Williams <pwil3058@...pond.net.au> wrote:

> At the moment, balance_tasks() provides low level functionality for 
> both
>  move_tasks() and move_one_task() (indirectly) via the load_balance() 
> function (in the sched_class interface) which also provides dual 
> functionality.  This dual functionality complicates the interfaces and 
> internal mechanisms and makes the run time overhead of operations that 
> are called with two run queue locks held.
> 
> This patch addresses this issue and reduces the overhead of these 
> operations.

hm, i like it, and added it to my queue (probably .24 material though), 
but note that it increases .text and .data overhead:

   text    data     bss     dec     hex filename
  41028   37794    2168   80990   13c5e sched.o.before
  41349   37826    2168   81343   13dbf sched.o.after

is that expected?

	Ingo
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