Wojciech Puchar wrote:
>>
>> other question - tried enabling it on my i386 laptop (256 megs
>> ram), always
>> mappings==0, while promitions>demotions>0.
>>
>>
>> The default starting address for executables on i386 is not aligned
>> to a 2/4MB page boundary. Hence, "mappings" are much less likely to
>> occur.
>>
>>
>> certainly there are apps that could be put on big pages, gimp
>> editing 40MB bitmap for
>> example
>>
>>
>> Regards,
>> Alan
>>
>>
>>
> how can i check how much (or maybe - what processes) 2MB pages are
> actually allocated?
I'm afraid that you can't with great precision. For a given program
execution, on an otherwise idle machine, you can only estimate the
number by looking at the change in the quantity "promotions + mappings -
demotions" before, during, and after the program execution.
A program can call mincore(2) in order to determine if a virtual address
is part of a 2 or 4MB virtual page.
Alan
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