Re: [PATCH v3] oom-kill: add lowmem usage aware oom kill handling

From: David Rientjes
Date: Wed Jan 27 2010 - 18:46:25 EST

On Wed, 27 Jan 2010, KAMEZAWA Hiroyuki wrote:

> Yes, I think you're right. But "breaking current behaviro of our servers!"
> arguments kills all proposal to this area and this oom-killer or vmscan is
> a feature should be tested by real users.

Nobody has said we should discount lowmem rss when dealing with a GFP_DMA
allocation, it simply wasn't possible until the lowmem rss counters were
introduced in -mm. It would prevent the needless killing of innocent
tasks which would not allow the page allocation to succeed, so it's a good
feature to have. It doesn't need to be configurable at all, we just need
to find a way to introduce it into the heuristic without mangling oom_adj.
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