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

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Message-Id: <1244796426.7172.90.camel@pasglop>
Date:	Fri, 12 Jun 2009 18:47:06 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, mingo@...e.hu
Subject: Re: slab: setup allocators earlier in the boot sequence

On Fri, 2009-06-12 at 11:17 +0300, Pekka Enberg wrote:
> Hi Ben,
> 
> On Fri, 2009-06-12 at 17:39 +1000, Benjamin Herrenschmidt wrote:
> > For example, slab_is_available() didn't always exist, and so in the
> > early days on powerpc, we used a mem_init_done global that is set form
> > mem_init() (not perfect but works in practice). And we still have code
> > using that to do the test.
> 
> Looking at powerpc arch code, can we get rid of the *_maybe_bootmem()
> functions now? Or is slab initialization too late still? FWIW, I think
> one simple fix on PPC is to just clear __GFP_NOWAIT in those functions
> (all of them seem to be using GFP_KERNEL which is wrong during boot).

I -think- we still use those in setup_arch() so we can't get rid of that
completely yet.

Cheers,
Ben.

> 			Pekka
> 
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