Re: [RFC PATCH] mm, oom: introduce vm.sacrifice_hugepage_on_oom

On Wed 17-02-21 13:31:07, Michal Hocko wrote:
[...]

Thanks for your usecase description. It helped me to understand what you
are doing and how this can be really useful for your particular setup.
This is really a very specific situation from my POV. I am not yet sure
this is generic enough to warrant for a yet another tunable. One thing
you can do [1] is to
hook into oom notifiers interface (register_oom_notifier) and release
pages from the callback.

Forgot to mention that this would be done from a kernel module.

Why is that batter than a global tunable?
For one thing you can make the implementation tailored to your specific
usecase. As the review feedback has shown this would be more tricky to
be done in a general case. Unlike a generic solution it would allow you
to coordinate with your userspace if you need. Would something like that
work for you?

---
[1] and I have to say I hate myself for suggesting that because I was
really hoping this interface would go away. But the reality disagrees so
I gave up on that goal...
-- 
Michal Hocko
SUSE Labs

-- 
Michal Hocko
SUSE Labs