Re: [RFC v2 PATCH 0/4] speed up page allocation for __GFP_ZERO

[Liang Li]

> > Win or not depends on its effect. For our case, it solves the issue
> > that we faced, so it can be thought as a win for us.  If others don't
> > have the issue we faced, the result will be different, maybe they will
> > be affected by the side effect of this feature. I think this is your
> > concern behind the question. right? I will try to do more tests and
> > provide more benchmark performance data.
>
> Yes, zeroying memory does have a noticeable overhead but we cannot
> simply allow tasks to spil over this overhead to all other users by
> default. So if anything this would need to be an opt-in feature
> configurable by administrator.
> --
> Michal Hocko
> SUSE Labs

I know the overhead, so I add a switch in /sys/ to enable or disable
it dynamically.

Thanks
Liang