linux-kernel - Re: Plumbers: Tweaking scheduler policy micro-conf RFP

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Message-ID: <20120523150359.GB26974@gmail.com>
Date:	Wed, 23 May 2012 17:03:59 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Chen <hi3766691@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: Plumbers: Tweaking scheduler policy micro-conf RFP


* Chen <hi3766691@...il.com> wrote:

> Still you are just trying to said that your code is not bloated?
> Up to over 500K for a cpu scheduler. Laughing

Where did you get that 500K from? You are off from the truth 
almost by an order of magnitude.

Here's the scheduler size on Linus's latest tree, on 64-bit 
defconfig's:

 $ size kernel/sched/built-in.o 
   text	   data	    bss	    dec	    hex	filename
  83611	  10404	   2524	  96539	  1791b	kernel/sched/built-in.o

That's SMP+NUMA, i.e. everything included.

The !NUMA !SMP UP scheduler, if you are on a size starved 
ultra-embedded device, is even smaller, just 22K:

 $ size kernel/sched/built-in.o 
   text	   data	    bss	    dec	    hex	filename
  19882	   2218	    148	  22248	   56e8	kernel/sched/built-in.o

Thanks,

	Ingo
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