On Mon, 14 Sep 2015 22:31:42 +0300 Ebru Akagunduz [off-list ref] wrote:

This patch series makes swapin readahead up to a
certain number to gain more thp performance and adds
tracepoint for khugepaged_scan_pmd, collapse_huge_page,
__collapse_huge_page_isolate.

I'll merge this series for testing.  Hopefully Andrea and/or Hugh will
find time for a quality think about the issue before 4.3 comes around.

It would be much better if we didn't have that sysfs knob - make the
control automatic in some fashion.

If we can't think of a way of doing that then at least let's document
max_ptes_swap very carefully.  Explain to our users what it does, why
they should care about it, how they should set about determining (ie:
measuring) its effect upon their workloads.

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