Re: [PATCH] various allocator optimizations

[Hans Reiser <reiser@namesys.com>]

Chris Mason wrote:

>On Wed, 2003-03-12 at 06:12, Hans Reiser wrote:
>
>  
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>>>I like the idea of a dynamic in-kernel fragmentation tool though, you
>>>mark a file as being in need of reallocation, and it happens before io
>>>or something (hand waving is fun).
>>>
>>>      
>>>
>>You mean you like the allocate on flush we do in reiser4?
>>
>>Perhaps I should say only that for 80% of machines 80% of the files 
>>never move during the course of a week.;-)
>>
>>allocate on flush will improve a lot of the cases, and an online 
>>repacker will improve a lot of the ones that allocate on flush does not 
>>improve.
>>    
>>
>
>None of which solves the question of how do we lay things out on disk
>;-)
>
>-chris
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Well, okay, so what are you proposing and what are your benchmarks?  
This is an area where the algorithms are simple but their consequences 
are just guesses until they are measured.

-- 
Hans