Re: [PATCH 0/3] Fix malloc() stall in zone_reclaim() and bring behaviour more in line with expectations V3

From: KOSAKI Motohiro
Date: Wed Jun 17 2009 - 06:07:06 EST

> On Tue, 16 Jun 2009, Mel Gorman wrote:
> > I don't have a particular workload in mind to be perfectly honest. I'm just not
> > convinced of the wisdom of trying to unmap pages by default in zone_reclaim()
> > just because the NUMA distances happen to be large.
> zone reclaim = 1 is supposed to be light weight with minimal impact. The
> intend was just to remove potentially unused pagecache pages so that node
> local allocations can succeed again. So lets not unmap pages.

hm, At least major two zone reclaim developer disagree my patch. Thus I have to
agree with you, because I really don't hope to ignore other developer's opnion.

So, as far as I understand, the conclusion of this thread are
- Drop my patch
- instead, implement improvement patch of (may_unmap && page_mapped()) case
- the documentation should be changed
- it's my homework(?)

Can you agree this?

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