Re: [RFC PATCH 0/8] memcg: Enable fine-grained per process memory control

[Waiman Long]

On 8/18/20 6:17 AM, Chris Down wrote:
> peterz@xxxxxxxxxxxxx writes:
> > But then how can it run-away like Waiman suggested?
>
> Probably because he's not running with that commit at all. We and 
> others use this to prevent runaway allocation on a huge range of 
> production and desktop use cases and it works just fine.
>
> > /me goes look... and finds MEMCG_MAX_HIGH_DELAY_JIFFIES.
> >
> > That's a fail... :-(
>
> I'd ask that you understand a bit more about the tradeoffs and 
> intentions of the patch before rushing in to declare its failure, 
> considering it works just fine :-)
>
> Clamping the maximal time allows the application to take some action 
> to remediate the situation, while still being slowed down 
> significantly. 2 seconds per allocation batch is still absolutely 
> plenty for any use case I've come across. If you have evidence it 
> isn't, then present that instead of vague notions of "wrongness".
Sorry for the late reply.

I ran some test on the latest kernel and and it seems to work as 
expected. I was running the test on an older kernel that doesn't have 
this patch and I was not aware of it before hand.

Sorry for the confusion.

Cheers,
Longman