Re: [PATCH 0/4] [RFC][v4] Workaround for Xeon Phi PTE A/D bits erratum

[Vlastimil Babka]

On 07/13/2016 01:37 PM, Vlastimil Babka wrote:
> > > With the errata, don't you have a situation where a processor in the second
> > > category will write and set D despite P having been cleared (due to the
> > > race) and thus causing us to miss the transfer of that D to the struct
> > > page and essentially completely miss that the physical page is dirty ?
> Seems to me like this is indeed possible, but...

Nevermind, I have read the v3 thread now, where Dave says [1] that 
setting the D bit due to the erratum doesn't mean that the page is 
really actually written to (it's not). So there shouldn't be any true 
dirty bit to leave behind.

[1] http://marc.info/?l=linux-mm&m=146738965614826&w=2