[FYI] tux3: Core changes
david at lang.hm
Mon May 25 23:13:46 PDT 2015
On Mon, 25 May 2015, Daniel Phillips wrote:
> On Monday, May 25, 2015 11:04:39 PM PDT, David Lang wrote:
>> if the page gets modified again, will that cause any issues? what if the
>> page gets modified before the copy gets written out, so that there are two
>> dirty copies of the page in the process of being written?
>> David Lang
> How is the page going to get modified again? A forked page isn't
> mapped by a pte, so userspace can't modify it by mmap. The forked
> page is not in the page cache, so usespace can't modify it by
> posix file ops. So the writer would have to be in kernel. Tux3
> knows what it is doing, so it won't modify the page. What kernel
> code besides Tux3 will modify the page?
I'm assuming that Rik is talking about whatever has the reference to the page
via one of the methods that he talked about.
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