Messages in this thread | | | Subject | Re: [PATCH 0/4] [RFC][v4] Workaround for Xeon Phi PTE A/D bits erratum | From | Vlastimil Babka <> | Date | Wed, 13 Jul 2016 14:10:07 +0200 |
| |
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
| |