From: John Hubbard <jhubbard@xxxxxxxxxx> Hi, Summary: I'd like these two patches to go into the next convenient cycle. I *think* that means 4.21. Details At the Linux Plumbers Conference, we talked about this approach [1], and the primary lingering concern was over performance. Tom Talpey helped me through a much more accurate run of the fio performance test, and now it's looking like an under 1% performance cost, to add and remove pages from the LRU (this is only paid when dealing with get_user_pages) [2]. So we should be fine to start converting call sites. This patchset gets the conversion started. Both patches already had a fair amount of review. (Tom, I'll add you Tested-by to the actual implementation that moves pages on and off the LRU. These first two patches don't do that.) [1] https://linuxplumbersconf.org/event/2/contributions/126/ "RDMA and get_user_pages" [2] https://lore.kernel.org/r/79d1ee27-9ea0-3d15-3fc4-97c1bd79c990@xxxxxxxxxx John Hubbard (2): mm: introduce put_user_page*(), placeholder versions infiniband/mm: convert put_page() to put_user_page*() drivers/infiniband/core/umem.c | 7 +- drivers/infiniband/core/umem_odp.c | 2 +- drivers/infiniband/hw/hfi1/user_pages.c | 11 ++- drivers/infiniband/hw/mthca/mthca_memfree.c | 6 +- drivers/infiniband/hw/qib/qib_user_pages.c | 11 ++- drivers/infiniband/hw/qib/qib_user_sdma.c | 6 +- drivers/infiniband/hw/usnic/usnic_uiom.c | 7 +- include/linux/mm.h | 20 ++++++ mm/swap.c | 80 +++++++++++++++++++++ 9 files changed, 123 insertions(+), 27 deletions(-) -- 2.19.2
