Re: [PATCH 4.14 108/159] kvm, mm: account kvm related kmem slabs to kmemcg

[Greg Kroah-Hartman]

On Fri, Dec 22, 2017 at 10:34:07AM +0100, Michal Hocko wrote:
> On Fri 22-12-17 09:46:33, Greg KH wrote:
> > 4.14-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Shakeel Butt <shakeelb@xxxxxxxxxx>
> > 
> > 
> > [ Upstream commit 46bea48ac241fe0b413805952dda74dd0c09ba8b ]
> > 
> > The kvm slabs can consume a significant amount of system memory
> > and indeed in our production environment we have observed that
> > a lot of machines are spending significant amount of memory that
> > can not be left as system memory overhead. Also the allocations
> > from these slabs can be triggered directly by user space applications
> > which has access to kvm and thus a buggy application can leak
> > such memory. So, these caches should be accounted to kmemcg.
> > 
> > Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
> > Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> > Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> 
> The patch is not marked for stable, neither it fixes an existing bug.
> It is a nice to have thing for sure but I am wondering how this got
> through stable-filter. 

Sasha picked it out, and it seemed like a sane thing to backport.  If
you think it's not worthy, I'll gladly drop it, but it seemed like such
a simple bugfix to include.

thanks,

greg k-h