On Sun, 17 Mar 2019 11:34:31 -0700 ira.we...@intel.com wrote: > Resending after rebasing to the latest mm tree. > > HFI1, qib, and mthca, use get_user_pages_fast() due to it performance > advantages. These pages can be held for a significant time. But > get_user_pages_fast() does not protect against mapping FS DAX pages. > > Introduce FOLL_LONGTERM and use this flag in get_user_pages_fast() which > retains the performance while also adding the FS DAX checks. XDP has also > shown interest in using this functionality.[1] > > In addition we change get_user_pages() to use the new FOLL_LONGTERM flag and > remove the specialized get_user_pages_longterm call.
It would be helpful to include your response to Christoph's question (http://lkml.kernel.org/r/20190220180255.ga12...@iweiny-desk2.sc.intel.com) in the changelog. Because if one person was wondering about this, others will likely do so. We have no record of acks or reviewed-by's. At least one was missed (http://lkml.kernel.org/r/caog9msttcd-9bcsdfc0wryqfvrnb4twozl0c4+6qxi-n_y4...@mail.gmail.com), but that is very very partial. This patchset is fairly DAX-centered, but Dan wasn't cc'ed! So ho hum. I'll scoop them up and shall make the above changes to the [1/n] changelog, but we still have some work to do.
