[RFC][PATCH 0/5] VM_PINNED

[Peter Zijlstra]

Hi all,

I mentioned at LSF/MM that I wanted to revive this, and at the time there were
no disagreements.

I finally got around to refreshing the patch(es) so here goes.

These patches introduce VM_PINNED infrastructure, vma tracking of persistent
'pinned' page ranges. Pinned is anything that has a fixed phys address (as
required for say IO DMA engines) and thus cannot use the weaker VM_LOCKED. One
popular way to pin pages is through get_user_pages() but that not nessecarily
the only way.

Roland, as said, I need some IB assistance, see patches 4 and 5, where I got
lost in the qib and ipath code.

Patches 1-3 compile tested.

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