Re: ORMAP

[John Richard Moser <nigelenki@comcast.net>]

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Nick Piggin wrote:
> John Richard Moser wrote:
> 
>> Nick Piggin wrote:
>>
>>> 2.6 has an object based rmap system working nicely for quite
>>> a while now (though it was probably not exactly what you saw
>>> in the -wli tree, but a derivative).
>>>
>>> It would be surprising if that made your system boot 3 times
>>> faster though (unless it was on the edge of a swap storm or
>>> something)
>>>
>>
>> Dramatization.  It was probably around 30 seconds faster on a 2-3 minute
>> boot sequence (I had a lot in rc.d), but it was noticeable :P
>>
>> I was wondering about that stuff.  There used to be a few cute things
>> out there but I can't remember any of it now.  Page clustering etc etc.
>>
>>
> 
> Well I don't think any of that stuff was simply forgotten. Page
> clustering for
> i386, for example became less important because of objrmap, reductions
> in size
> of struct page, and the demise of insane highmem machines (due to x86-64).
> 

Cool cool.  What juicy things are out there these days that will
probably make future kernels faster and more memory-light?  New
schedulers?  Ingo's SLAB rewrite and priority inheritance?

> Nick
> -- 
> 
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