linux-kernel - Re: [GIT PULL] scheduler fixes

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Date:	Sun, 24 May 2009 21:52:45 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jeff Garzik <jgarzik@...ox.com>,
	Alexander Viro <viro@....linux.org.uk>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [GIT PULL] scheduler fixes

Ingo Molnar wrote:
> 
> Would it be possible to restructure things to move kmalloc init to 
> before IRQ init as well? We have a couple of uglinesses there too.
> 
> Conceptually, memory should be the first thing set up in general, in 
> a kernel. It does not need IRQs, timers, the scheduler or any of the 
> IO facilities and abstractions. All of them need memory though - and 
> as Linux scales to more and more hardware via the same single image, 
> so will we get more and more dynamic concepts like cpumask_var_t and 
> sparse-irqs, which want to allocate very early.
> 
> setup_arch() is one huge function that sets up all architecture 
> details at once - but if we split a separate setup_arch_mem() out of 
> it, and left the rest in setup_arch (and moved it further down), we 
> could remove much of bootmem (especially the ugly uses).
> 
> This might even be doable realistically, and we could thus librarize 
> bootmem and eliminate it from x86 at least. Perhaps.
> 

The only thing that might make sense to set up before memory might be
exceptions (as opposed to interrupts), but both of those should be
doable very very early.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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