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

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Date:	Tue, 30 Mar 2010 10:31:31 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	michael@...erman.id.au
Cc:	Yinghai Lu <yinghai@...nel.org>, 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 Tue, 2010-03-30 at 09:20 +1100, Michael Ellerman wrote:
> 
> But that's my point. You shouldn't need to touch the existing API, and
> you shouldn't need to add a new parallel API. You should just be able to
> add the logic for doubling the array in the lmb core, and then everyone
> gets dynamically expandable lmb. I don't see any reason why we want to
> have two APIs.

Ack.

> > > It seems to me that rather than adding these "special" routines that
> > > check for enough space on the way in, instead you should be checking in
> > > lmb_add_region() - which is where AFAICS all allocs/frees/reserves
> > > eventually end up if they need to insert a new region.
> > 
> > later i prefer to replace lmb_alloc with find_lmb_area + reserve_lmb.
> 
> Why? The existing code has been working for years and is well tested? 

I still don't totally understand why he needs a find_lmb_area()
anyways. 

It might be justified ... or not. I just want it to be better
documented.

Cheers,
Ben.


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