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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