RE: [PATCH 1/1] mm: prevent poison consumption when splitting THP

[Zhuo, Qiuxu]

Hi Tony,

> From: Luck, Tony <tony.luck@xxxxxxxxx>
> [...]
> Subject: RE: [PATCH 1/1] mm: prevent poison consumption when splitting THP
> 
> > Miaohe mentioned in another e-mail that there was an HWPoisoned flag
> for the raw error 4K page.
> > We could use that flag just to skip that raw error page and still use
> > the zeropage for other healthy sub-pages. I'll try that.
> 
> That HWPoisoned flag is only set for raw pages where an error has been
> detected. Maybe Linux could implement an
> "is_this_page_all_zero_mc_safe()"[1] that would catch undetected poison

This sounds like a great suggestion to me. 
Let's see what others think about this and the name (though the name already LGTM 😊).

> and avoid a crash in that case too?
> 
> -Tony
> 
> [1] terrible name, pick something better.