linux-kernel - Re: slab: setup allocators earlier in the boot sequence

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Date:	Fri, 12 Jun 2009 19:44:25 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, mingo@...e.hu,
	cl@...ux-foundation.org, akpm@...ux-foundation.org
Subject: Re: slab: setup allocators earlier in the boot sequence

On Fri, 2009-06-12 at 11:30 +0200, Nick Piggin wrote:
> On Fri, Jun 12, 2009 at 07:24:20PM +1000, Benjamin Herrenschmidt wrote:
> > 
> > > It's OK. I'd make it gfp_notsmellybits, and avoid the ~.
> > > And read_mostly.
> > 
> > read_mostly is fine. gfp_notsmellybits isn't a nice name :-) Make it
> > gfp_allowedbits then. I did it backward on purpose though as the risk of
> > "missing" bits here (as we may add new ones) is higher and it seemed to
> > me generally simpler to just explicit spell out the ones to forbid
> > (also, on powerpc,  &~ is one instruction :-)
> 
> But just do the ~ in the assignment. No missing bits :)

Heh, ok.
> Yeah but it doesn't do it in the page allocator so it isn't
> really useful as a general allocator flags tweak. ATM it only
> helps this case of slab allocator hackery.

I though I did it in page_alloc.c too but I'm happy to be told what I
missed :-) The intend is certainly do have a general allocator flag
tweak.

Cheers,
Ben.


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