Re: Do we need to unrevert "fs: do not prefault sys_write() user buffer pages"?

[David Howells]

Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:

> > It may also cause the read in to happen in the background whilst write_begin
> > is being done.
> 
> Huh?  Last I checked, the fault_in_readable actually read a byte from
> the page.  It has to wait for the read to complete before that can
> happen.

Ah, good point.

David