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

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Date:	Fri, 6 Nov 2009 10:50:04 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	chrisw@...s-sol.org, dwmw2@...radead.org, joerg.roedel@....com,
	akpm@...ux-foundation.org, yinghai@...nel.org,
	torvalds@...ux-foundation.org, tj@...nel.org,
	a.p.zijlstra@...llo.nl, penberg@...helsinki.fi,
	vegard.nossum@...il.com, hpa@...or.com, tglx@...utronix.de
Subject: Re: [PATCH 07/10] bootmem: add free_bootmem_late

On Wed, 28 Oct 2009 08:48:32 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> 
> > From: Chris Wright <chrisw@...s-sol.org>
> > 
> > Add a new function for freeing bootmem after the bootmem allocator has
> > been released and the unreserved pages given to the page allocator.
> > This allows us to reserve bootmem and then release it if we later
> > discover it was not needed.
> > 
> > Reviewed-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> > Signed-off-by: Chris Wright <chrisw@...s-sol.org>
> > ---
> >  include/linux/bootmem.h |    1 +
> >  mm/bootmem.c            |   43 ++++++++++++++++++++++++++++++++++++++-----
> >  2 files changed, 39 insertions(+), 5 deletions(-)
> 
> Hm, we are now further complicating the bootmem model.

Yeah, agreed. But reorganizing the allocator during boot is not
easy. I'll investigate it later on but VT-d people want to fix this
IOMMU issue now. Can we accept this for now?
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