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SubjectRe: [PATCH] swapin flush cache bug
Russell King wrote:
> Unless someone else (Rik/DaveM) says otherwise, it is my understanding
> that any IO for page P will only ever be a write to disk. Therefore,
> when you get a copy of the page from the swap cache, the physical memory
> for that page is the same as it was when the process was using it last.
[...]
> The data from memory will still be up to date though. However, I agree
> that you will end up with cache aliases. I will also end up with cache
> aliases. The question now is, do these aliases really matter?
>
> On my caches, the answer is no because they're not marked dirty, and
> therefore will get dropped from the cache without writeback to memory.
>
> If your cache doesn't write back clean cache data to memory, then you
> should also behave well.

Yes, that's the difference. It's write back cache, in my case.
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