linux-kernel - Re: [PATCH 07/31] lmb: Add reserve_lmb/free

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Date:	Tue, 30 Mar 2010 16:26:34 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	michael@...erman.id.au, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 07/31] lmb: Add reserve_lmb/free_lmb

On Mon, 2010-03-29 at 17:03 -0700, Yinghai Lu wrote:
> 
> in short: It could make us to avoid use the range that we are going to
> reserve,
>       when we try to get new position new lmb.reserved.region. 

I'm not too sure I follow you. For the resizing, I would just basically
call a low level variant of alloc (__lmb_alloc ?) that explicitely
doesn't honor the total-2 "reserved" entries in the array.

Ie. It should all be one single find/allocation function.

In fact, you want to split lmb_find from lmb_reserve, then just make
lmb_alloc use the above, I don't want 2 implementations of the same
thing (maybe call it __lmb_find to expose the fact that it's a low level
function to avoid for normal use).

Cheers,
Ben.

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