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Date: Mon, 25 Mar 2019 15:36:28 -0700 From: Dan Williams <dan.j.williams@...el.com> To: Ira Weiny <ira.weiny@...el.com> Cc: Jason Gunthorpe <jgg@...pe.ca>, Andrew Morton <akpm@...ux-foundation.org>, John Hubbard <jhubbard@...dia.com>, Michal Hocko <mhocko@...e.com>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Peter Zijlstra <peterz@...radead.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, "David S. Miller" <davem@...emloft.net>, Martin Schwidefsky <schwidefsky@...ibm.com>, Heiko Carstens <heiko.carstens@...ibm.com>, Rich Felker <dalias@...c.org>, Yoshinori Sato <ysato@...rs.sourceforge.jp>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Ralf Baechle <ralf@...ux-mips.org>, James Hogan <jhogan@...nel.org>, linux-mm <linux-mm@...ck.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, linux-mips@...r.kernel.org, linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, linux-s390 <linux-s390@...r.kernel.org>, Linux-sh <linux-sh@...r.kernel.org>, sparclinux@...r.kernel.org, linux-rdma <linux-rdma@...r.kernel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Re: [RESEND 4/7] mm/gup: Add FOLL_LONGTERM capability to GUP fast On Mon, Mar 25, 2019 at 3:22 PM Ira Weiny <ira.weiny@...el.com> wrote: [..] > FWIW this thread is making me think my original patch which simply implemented > get_user_pages_fast_longterm() would be more clear. There is some evidence > that the GUP API was trending that way (see get_user_pages_remote). That seems > wrong but I don't know how to ensure users don't specify the wrong flag. What about just making the existing get_user_pages_longterm() have a fast path option?
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