linux-kernel - Re: [patch 3/4] cpu alloc: The allocator

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Message-Id: <1223019811.30285.12.camel@penberg-laptop>
Date:	Fri, 03 Oct 2008 10:43:31 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	rusty@...tcorp.com.au, jeremy@...p.org, ebiederm@...ssion.com,
	travis@....com, herbert@...dor.apana.org.au, xemul@...nvz.org
Subject: Re: [patch 3/4] cpu alloc: The allocator

Hi Andrew,

On Fri, 2008-10-03 at 00:33 -0700, Andrew Morton wrote:
> > +static void set_map(int start, int length)
> > +{
> > +	while (length-- > 0)
> > +		__set_bit(start++, cpu_alloc_map);
> > +}
> 
> Can we use bitmap_fill() here?

But bitmap_fill() assumes that the starting offset is aligned to
unsigned long (which is not the case here), doesn't it?

On Fri, 2008-10-03 at 00:33 -0700, Andrew Morton wrote:
> But I'd have though that it would be possible to only allocate the
> storage for online CPUs.  That would be a pretty significant win for
> some system configurations?

Maybe, but then you'd have to deal with CPU hotplug... iik.

		Pekka

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