linux-kernel - Re: [PATCH 07/10] bootmem: add free_bootmem

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Date:	Wed, 28 Oct 2009 13:38:42 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Tejun Heo <tj@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	linux-kernel@...r.kernel.org, chrisw@...s-sol.org,
	dwmw2@...radead.org, joerg.roedel@....com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 07/10] bootmem: add free_bootmem_late

Hi Tejun,

On Wed, Oct 28, 2009 at 10:00 AM, Tejun Heo <tj@...nel.org> wrote:
> ISTR an attempt to initialize the kmalloc allocator much earlier
> during boot such that it can completely replace the bootmem allocator,
> which would nicely remove all the complications although it may
> require the kmalloc allocator to go through more complex boot
> strapping steps.  I didn't follow how that went.  Did it prove to be
> unworkable?

We're doing it before scheduler init now but I haven't put any effort
into moving it earlier than that yet. I don't see any fundamental
reason we can't do that but the practical problem is that we're going
to affect architecture specific boot code which is really hard to
test.

                        Pekka
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