linux-kernel - Re: [GIT PULL] scheduler fixes

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Message-Id: <200905192157.02079.rusty@rustcorp.com.au>
Date:	Tue, 19 May 2009 21:57:00 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Yinghai Lu <yinghai@...nel.org>,
	Jeff Garzik <jgarzik@...ox.com>,
	Alexander Viro <viro@....linux.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [GIT PULL] scheduler fixes

On Tue, 19 May 2009 07:36:26 am Linus Torvalds wrote:
> > One of the biggest user of bootmem is the mem_map[] hierarchies and
> > the page allocator bitmaps. Not sure we can get rid of bootmem there
> > - those areas are really large, physical memory is often fragmented
> > and we need a good NUMA sense for them as well.
>
> I think that's the _valid_ kind of use of a bootmem allocator.
>
> But for something like the scheduler data structures? Not so much.

Yeah, and it feels dirty to use slab_is_available() to figure if the code 
should kmalloc or alloc_bootmem.  

Ideally kmalloc/kfree would "always work".  But at least we could get closer.

Thanks,
Rusty.
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