Re: extent-patch and overview of what is supposed to follow

[Lars Heidieker <lars%heidieker.de@localhost>]

On 04/01/11 17:27, Christoph Egger wrote:
> On 04/01/11 08:35, Lars Heidieker wrote:
>> Hi,
>>
>> this is a part of the changes to the kernel memory management.
>> It's a changing the subr_extent to use kmem(9) instead of
>> malloc(9) essentially removing the MALLOC_TYPE from it.
>>
>> The next steps will provide the changes to the kmem(9)/pool(9)
>> and the pool/uvm_km interface. The uvm_km will gain caches for
>> multiplies of the page-size based on pool extending the current
>> 1-page-sized cache.
>>
>> Making a patch for the pool(9) uvm_km interface changes will be
>> next followed by the kmem(9)/malloc(9) merger. After that some
>> changes that remove malloc(9) use from sys/uvm/* and large parts
>> of sys/kern/* will follow.
>>
>> After that a big round of mechanical changes will follow that
>> change the (then based on kmem) mallocs function signature by
>> removing the MALLOC_TYPE completely or migrating the allocation
>> to kmem(9).
>>
>> I made some changes to the initialization order in uvm_init, the
>> idea behind this is to have the pool(9) allocators initialization
>> at explicit stages, this will make initialization of a standard
>> pool-allocators of different pool-page-sizes possible and will
>> catch use before ready cases. (This part needs further testing as
>> some changes in pmaps where necessary, I've compile tested all
>> the pmaps involved and boot-tested i386/amd64/sparc64)
>
> Hi,
>
> this all sounds good to me. The Xen port requires kmem(9) to return
> page aligned addresses to work correctly. kmem(9) currently doesn't
> guarantee this. I just want to bring this to your awareness.
>
> Christoph
>
Hi,

the kmem implementation I'm working on has page aligned allocations
for page size and larger allocations.

Lars

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