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

From: Kirill Korotaev
Date: Mon Aug 21 2006 - 06:38:33 EST

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
Then why do you mess user pages accounting into this thread then?


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