Re: [PATCH 0/4] get_user_pages*() and RDMA: first steps

[Jason Gunthorpe]

On Mon, Oct 01, 2018 at 04:11:27PM +1000, Dave Chinner wrote:

> This reminds me so much of Linux mmap() in the mid-2000s - mmap()
> worked for ext3 without being aware of page faults, so most mm/
> developers at the time were of the opinion that all the other
> filesystems should work just fine without being aware of page
> faults.

This is probably because RDMA was introduced around that time, before
page_mkwrite was added.. It kind of sounds like page_mkwrite() broke
all the writing get_user_pages users and it wasn't realized at the
time.

BTW, we are hosting a session on this at Plumbers during the RDMA
track, hope everyone interested will be able to attend.

Jason