Re: [PATCH V3] KSM: allow dedup all tasks memory

[Oleksandr Natalenko <oleksandr@natalenko.name>]

Hi.

> Yep. However, so far, it requires an application to explicitly opt in
> to this behavior, so it's not all that bad. Your patch would remove
> the requirement for application opt-in, which, in my opinion, makes
> this way worse and reduces the number of applications for which this
> is acceptable.

The default is to maintain the old behaviour, so unless the explicit 
decision is made by the administrator, no extra risk is imposed.

> As far as I know, basically nobody is using KSM at this point. There
> are blog posts from several cloud providers about these security risks
> that explicitly state that they're not using memory deduplication.

I tend to disagree here. Based on both what my company does and what 
UKSM users do, memory dedup is a desired option (note "option" word 
here, not the default choice).

Thanks.

-- 
   Oleksandr Natalenko (post-factum)