Date: Wed, 01 Apr 2009 01:53:50 -0700 (PDT)
Message-Id: <20090401.015350.161544996.davem@davemloft.net>
To: schwidefsky@de.ibm.com
Cc: tj@kernel.org, mingo@elte.hu, rusty@rustcorp.com.au, tglx@linutronix.de,
       x86@kernel.org, linux-kernel@vger.kernel.org, hpa@zytor.com,
       lethal@linux-sh.org, rmk@arm.linux.org.uk, starvik@axis.com,
       ralf@linux-mips.org, cooloney@kernel.org, kyle@mcmartin.ca,
       matthew@wil.cx, grundler@parisc-linux.org, takata@linux-m32r.org,
       benh@kernel.crashing.org, rth@twiddle.net, ink@jurassic.park.msu.ru,
       heiko.carstens@de.ibm.com
Subject: Re: [GIT RFC] percpu: use dynamic percpu allocator as the default
 percpu allocator
From: David Miller <davem@davemloft.net>
In-Reply-To: <20090401104737.22c8c66c@skybase>
References: <20090401103257.12c2517e@skybase>
	<20090401.013702.66171229.davem@davemloft.net>
	<20090401104737.22c8c66c@skybase>
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From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Wed, 1 Apr 2009 10:47:37 +0200

> We have thought about that solution as well but it not really a good
> one. For a machine with more than 4GB of memory we would either loose
> the memory that overlaps with the module area or we'd have to play
> nasty remapping tricks. On s390 the kernel image is linked to address 0
> (PAGE_OFFSET==0) and we have a simple 1:1 mapping for all real memory.

Flexibility can often cost you a few TLB entries, but that's
life :-)
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