linux-kernel - Re: [PATCH 3/3] mm/devmap: Remove pgmap accounting in the get_user_pages

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Message-ID: <20210325143419.GK2710221@ziepe.ca>
Date:   Thu, 25 Mar 2021 11:34:19 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Joao Martins <joao.m.martins@...cle.com>,
        Christoph Hellwig <hch@....de>,
        Shiyang Ruan <ruansy.fnst@...itsu.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        david <david@...morbit.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>
Subject: Re: [PATCH 3/3] mm/devmap: Remove pgmap accounting in the
 get_user_pages_fast() path

On Thu, Mar 18, 2021 at 10:03:06AM -0700, Dan Williams wrote:
> Yes. I still need to answer the question of whether mapping
> invalidation triggers longterm pin holders to relinquish their hold,
> but that's a problem regardless of whether gup-fast is supported or
> not.

It does not, GUP users do not interact with addres_space or mmu
notifiers

Jason