From: Andi Kleen <andi@firstfloor.org>
To: Avi Kivity <avi@qumranet.com>
Cc: Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Make LIST_POISON less deadly
Date: Tue, 20 May 2008 14:04:23 +0200 [thread overview]
Message-ID: <4832BE47.2070209@firstfloor.org> (raw)
In-Reply-To: <4832BB6A.8010809@qumranet.com>
Avi Kivity wrote:
> Andi Kleen wrote:
>>> Makes sense. I'll send out v3.
>>>
>>> Is there a similar range on i386?
>>>
>>
>> Don't think so. Address space is too precious here.
>>
>> What you could probably do is to unmap one fixed page in some range
>> that is always split to 4K pages anyways and use that. Perhaps somewhere
>> in the 640k-1MB range. But if you're unlucky this might require a
>> variable, not a constant.
>>
>
> I guess a fixmap would work for this. But then the offsets added to
> that page would need to be limited to 4K.
You could make a 3 page fixmap and point to the middle page. 3 because
negative offsets are also especially importants for list_heads due to
list_entry
-Andi
next prev parent reply other threads:[~2008-05-20 12:04 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-18 15:38 [PATCH] Make LIST_POISON less deadly Avi Kivity
2008-05-19 13:01 ` Ingo Molnar
2008-05-19 13:18 ` Avi Kivity
2008-05-19 13:22 ` Ingo Molnar
2008-05-19 13:35 ` Avi Kivity
2008-05-19 13:45 ` Avi Kivity
2008-05-19 19:04 ` Sam Ravnborg
2008-05-20 7:06 ` Avi Kivity
2008-05-20 11:24 ` Andi Kleen
2008-05-20 11:34 ` Avi Kivity
2008-05-20 11:49 ` Andi Kleen
2008-05-20 11:52 ` Avi Kivity
2008-05-20 12:04 ` Andi Kleen [this message]
2008-05-20 12:04 ` Ingo Molnar
2008-05-20 16:47 ` Pavel Machek
2008-05-20 16:50 ` Avi Kivity
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