Re: [PATCH RFC 3/3] proc/smaps: show amount of hwpoison pages

[Konstantin Khlebnikov]

KOSAKI Motohiro wrote:
> On Mon, Apr 30, 2012 at 7:29 AM, Konstantin Khlebnikov
> <khlebnikov@xxxxxxxxxx>  wrote:
> > This patch adds line "HWPoinson:<size>  kB" into /proc/pid/smaps if
> > CONFIG_MEMORY_FAILURE=y and some HWPoison pages were found.
> > This may be useful for searching applications which use a broken memory.
>
> I dislike "maybe useful" claim. If we don't know exact motivation of a feature,
> we can't maintain them especially when a bugfix can't avoid ABI change.
>
> Please write down exact use case.

I don't know how to exactly use this hw-poison stuff, but smaps suppose to
export state of ptes in vma. It seems to rational to show also hw-poisoned ptes,
since kernel has this feature and pte can be in hw-poisoned state.

and now everyone can easily find them:
# sudo grep HWPoison /proc/*/smaps
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