Re: [RFC][PATCH 5/7] UBC: kernel memory accounting (core)

[Kirill Korotaev]

> > 1. reclaiming user resources is not that good idea as it looks to you.
> > such solutions end up with lots of resources spent on reclaim.
> > for user memory reclaims mean consumption of expensive disk I/O bandwidth
> > which reduces overall system throughput and influences other users.
>
>
> May be I'm overlooking something very obvious.  Please tell me, what
> happens when a user hits a page fault and the page allocator is easily
> able to give a page from its pcp list.  But container is over its limit
> of physical memory.  In your patch there is no attempt by container
> support to see if some of the user pages are easily reclaimable.  What
> options a user will have to make sure some room is created.
The patch set send doesn't control user memory!
This topic is about kernel memory...

> > 2. kernel memory is mostly not reclaimable. can you reclaim vma structs or ipc ids?
>
>
> I'm not arguing about that at all.  If people want to talk about
> reclaiming kernel pages then that should be done independent of this
> subject.
Then why do you mess user pages accounting into this thread then?

Kirill

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