Subject: Re: kernel map entry merging and PR 24039
To: Matt Thomas <matt@3am-software.com>
From: Andrew Brown <atatat@atatdot.net>
List: tech-kern
Date: 02/10/2004 11:29:27
On Tue, Feb 10, 2004 at 08:01:45AM -0800, Matt Thomas wrote:
>>...
>> how can asserting UVM_FLAG_NOMERGE prevent splitting unless the
>> allocation is less than three pages in size? can't i simply make a
>> three page allocation with UVM_FLAG_NOMERGE set and then unmap the
>> middle page?
>
>True but the current uses of uvm_map and uvm_unmap in the kernel
>don't do that.
>
>They simply undo a previous uvm_map.
well, okay then. :)
so how many kernel map entries do you have today?
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