Re: [PATCHv6 06/37] thp: handle write-protection faults for file THP

[Matthew Wilcox]

On Thu, Jan 26, 2017 at 02:57:48PM +0300, Kirill A. Shutemov wrote:
> For filesystems that wants to be write-notified (has mkwrite), we will
> encount write-protection faults for huge PMDs in shared mappings.
> 
> The easiest way to handle them is to clear the PMD and let it refault as
> wriable.

... of course, the filesystem could implement ->pmd_fault, and then it
wouldn't hit this case ...