From: "H. Peter Anvin" <hpa@zytor.com>
To: David Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Casey Dahlin <cdahlin@redhat.com>,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [patch] x86: allow ZONE_DMA to be configurable
Date: Wed, 13 Oct 2010 17:44:18 -0700 [thread overview]
Message-ID: <4CB65262.3070507@zytor.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1010131739010.27124@chino.kir.corp.google.com>
On 10/13/2010 05:42 PM, David Rientjes wrote:
> You can already set the lowmem_reserve_ratio via
> /proc/sys/vm/lowmem_reserve_ratio.
And why is it then so hard to put in a single line in /etc/sysctl.conf
for you?
> We've run without ZONE_DMA for a couple years because we don't have such
> hardware limitations and would appreciate the ability to disable it with a
> config option rather than hacking the kernel to get it to compile. I'm
> sure Casey would as well as you can see in the thread "A question about
> ZONE_DMA".
>
> I don't see the harm in being able to conveniently disable the zone if you
> know what you're doing.
There are going to be a lot of very strange bug reports as a result.
-hpa
next prev parent reply other threads:[~2010-10-14 0:44 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-14 0:15 [patch] x86: allow ZONE_DMA to be configurable David Rientjes
2010-10-14 0:23 ` H. Peter Anvin
2010-10-14 0:42 ` David Rientjes
2010-10-14 0:44 ` H. Peter Anvin [this message]
2010-10-14 0:49 ` David Rientjes
2010-10-14 1:21 ` H. Peter Anvin
2010-10-14 1:48 ` David Rientjes
2010-10-14 2:38 ` H. Peter Anvin
2010-10-14 3:55 ` David Rientjes
2010-10-14 4:37 ` H. Peter Anvin
2010-10-14 4:46 ` David Rientjes
2010-10-14 15:38 ` H. Peter Anvin
2010-10-14 16:00 ` Pekka Enberg
2010-10-14 17:44 ` H. Peter Anvin
2010-10-14 18:34 ` Ingo Molnar
2010-10-14 19:35 ` Andrew Morton
2010-10-14 20:40 ` H. Peter Anvin
2010-10-15 3:03 ` Ingo Molnar
2010-10-15 4:45 ` H. Peter Anvin
2010-10-15 9:05 ` David Rientjes
2010-10-15 15:06 ` H. Peter Anvin
2010-10-14 22:08 ` David Rientjes
2010-10-14 8:10 ` Andrew Morton
2010-10-14 8:32 ` KOSAKI Motohiro
2010-10-14 22:15 ` David Rientjes
2010-10-14 22:32 ` Andrew Morton
2010-10-15 3:10 ` Ingo Molnar
2010-10-15 9:11 ` David Rientjes
2010-10-15 9:09 ` David Rientjes
2010-10-21 14:56 ` Christoph Lameter
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