Re: [RFC, PATCH] mm: map few pages around fault address if they arein page cache

From: Andi Kleen
Date: Fri Feb 07 2014 - 12:32:12 EST

> I haven't tested it much, but my kvm boots. There're few places where code
> should be fixed. __do_fault() and filemap_fault() are too ugly and need to
> be cleaned.
> I don't have any performance data yet.
> Any thoughts?

It seems very drastic to do it unconditionally. How about at least a simple
stream detection heuristic and perhaps also madvise?

There are some extreme cases where workloads could use a lot more memory
than before, if they access their memory sparsely in the right pattern.

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