question on symbol exports

Chris Friesen cfriesen at
Wed Feb 9 02:36:20 EST 2005

Dan Malek wrote:
> On Feb 7, 2005, at 4:35 PM, Benjamin Herrenschmidt wrote:
>> Interesting... more than no swap, you must also make sure you have no
>> r/w mmap'ed file (which are technically equivalent to swap).
> Yeah, I kinda had a similar thought.  Just because you aren't
> swapping doesn't mean the VM subsystem isn't looking at dirty bits,
> too.  It could potentially steal a page that it thinks can be replaced
> from either a zero-fill or reading again from persistent storage.

In our existing case, the app also mlock()s the pages in question.  This 
should get around these two possible sources of inaccuracy.


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