Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality insys_msync()

[Miklos Szeredi]

> So it's not horribly hard, but it's kind of a separate issue right now. 
> And while the *generic* page-writeback is easy enough to fix, I worry 
> about low-level filesystems that have their own "writepages()" 
> implementation. They could easily get that wrong.

Yeah, nasty.

How about doing it in a separate pass, similarly to
wait_on_page_writeback()?  Just instead of waiting, clean the page
tables for writeback pages.

> So right now it seems that waiting for writeback to finish is the right 
> and safe thing to do (and even so, I'm not actually willing to commit my 
> suggested patch in 2.6.24, I think this needs more thinking about)

Sure, I would have though all of this stuff is 2.6.25, but it's your
kernel... :)

Miklos
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