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From: Ira Weiny <ira.weiny@intel.com>
To: John Hubbard <jhubbard@nvidia.com>
Cc: "Michal Hocko" <mhocko@suse.com>, "Jan Kara" <jack@suse.cz>,
	kvm@vger.kernel.org, linux-doc@vger.kernel.org,
	"David Airlie" <airlied@linux.ie>,
	"Dave Chinner" <david@fromorbit.com>,
	dri-devel@lists.freedesktop.org,
	LKML <linux-kernel@vger.kernel.org>,
	linux-mm@kvack.org, "Paul Mackerras" <paulus@samba.org>,
	linux-kselftest@vger.kernel.org, "Shuah Khan" <shuah@kernel.org>,
	"Jonathan Corbet" <corbet@lwn.net>,
	linux-rdma@vger.kernel.org,
	"Christoph Hellwig" <hch@infradead.org>,
	"Jason Gunthorpe" <jgg@ziepe.ca>,
	"Vlastimil Babka" <vbabka@suse.cz>,
	"Björn Töpel" <bjorn.topel@intel.com>,
	linux-media@vger.kernel.org, linux-block@vger.kernel.org,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Al Viro" <viro@zeniv.linux.org.uk>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Mauro Carvalho Chehab" <mchehab@kernel.org>,
	bpf@vger.kernel.org,
	"Magnus Karlsson" <magnus.karlsson@intel.com>,
	"Jens Axboe" <axboe@kernel.dk>,
	netdev@vger.kernel.org,
	"Alex Williamson" <alex.williamson@redhat.com>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	linux-fsdevel@vger.kernel.org,
	"Andrew Morton" <akpm@linux-foundation.org>,
	linuxppc-dev@lists.ozlabs.org,
	"David S . Miller" <davem@davemloft.net>,
	"Mike Rapoport" <rppt@kernel.org>,
	"Mike Kravetz" <mike.kravetz@oracle.com>
Subject: Re: [PATCH v2 05/18] mm/gup: introduce pin_user_pages*() and FOLL_PIN
Date: Wed, 6 Nov 2019 18:25:08 -0800
Message-ID: <20191107022508.GB32084@iweiny-DESK2.sc.intel.com> (raw)
In-Reply-To: <9ac948a4-59bf-2427-2007-e460aad2848a@nvidia.com>

> 
> 
> ...
> >> +This document describes the following functions: ::
> >> +
> >> + pin_user_pages
> >> + pin_user_pages_fast
> >> + pin_user_pages_remote
> >> +
> >> + pin_longterm_pages
> >> + pin_longterm_pages_fast
> >> + pin_longterm_pages_remote
> >> +
> >> +Basic description of FOLL_PIN
> >> +=============================
> >> +
> >> +A new flag for get_user_pages ("gup") has been added: FOLL_PIN. FOLL_PIN has
> > 
> > Consider reading this after, say, half a year ;-)
> > 
> 
> OK, OK. I knew when I wrote that that it was not going to stay new forever, but
> somehow failed to write the right thing anyway. :) 
> 
> Here's a revised set of paragraphs:
> 
> Basic description of FOLL_PIN
> =============================
> 
> FOLL_PIN and FOLL_LONGTERM are flags that can be passed to the get_user_pages*()
> ("gup") family of functions. FOLL_PIN has significant interactions and
> interdependencies with FOLL_LONGTERM, so both are covered here.
> 
> Both FOLL_PIN and FOLL_LONGTERM are internal to gup, meaning that neither
> FOLL_PIN nor FOLL_LONGTERM should not appear at the gup call sites. This allows
> the associated wrapper functions  (pin_user_pages() and others) to set the
> correct combination of these flags, and to check for problems as well.

I like this revision as well.

Ira


  reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-03 21:17 [PATCH v2 00/18] mm/gup: track dma-pinned pages: FOLL_PIN, FOLL_LONGTERM John Hubbard
2019-11-03 21:17 ` [PATCH v2 01/18] mm/gup: pass flags arg to __gup_device_* functions John Hubbard
2019-11-04 16:39   ` Jerome Glisse
2019-11-03 21:17 ` [PATCH v2 02/18] mm/gup: factor out duplicate code from four routines John Hubbard
2019-11-04 16:51   ` Jerome Glisse
2019-11-03 21:17 ` [PATCH v2 03/18] goldish_pipe: rename local pin_user_pages() routine John Hubbard
2019-11-04 16:52   ` Jerome Glisse
2019-11-03 21:17 ` [PATCH v2 04/18] media/v4l2-core: set pages dirty upon releasing DMA buffers John Hubbard
2019-11-10 10:10   ` Hans Verkuil
2019-11-11 21:46     ` John Hubbard
2019-11-03 21:18 ` [PATCH v2 05/18] mm/gup: introduce pin_user_pages*() and FOLL_PIN John Hubbard
2019-11-04 17:33   ` Jerome Glisse
2019-11-04 19:04     ` John Hubbard
2019-11-04 19:18       ` Jerome Glisse
2019-11-04 19:30         ` John Hubbard
2019-11-04 19:52           ` Jerome Glisse
2019-11-04 20:09             ` John Hubbard
2019-11-04 20:31               ` Jason Gunthorpe
2019-11-04 20:40                 ` John Hubbard
2019-11-04 20:31               ` Jerome Glisse
2019-11-04 20:37                 ` Jason Gunthorpe
2019-11-04 20:57                   ` John Hubbard
2019-11-04 21:15                     ` Jason Gunthorpe
2019-11-04 21:34                       ` John Hubbard
2019-11-04 20:33   ` David Rientjes
2019-11-04 20:48     ` Jerome Glisse
2019-11-05 13:10   ` Mike Rapoport
2019-11-05 19:00     ` John Hubbard
2019-11-07  2:25       ` Ira Weiny [this message]
2019-11-07  8:07       ` Mike Rapoport
2019-11-03 21:18 ` [PATCH v2 06/18] goldish_pipe: convert to pin_user_pages() and put_user_page() John Hubbard
2019-11-03 21:18 ` [PATCH v2 07/18] infiniband: set FOLL_PIN, FOLL_LONGTERM via pin_longterm_pages*() John Hubbard
2019-11-04 20:33   ` Jason Gunthorpe
2019-11-04 20:48     ` John Hubbard
2019-11-04 20:57       ` Jason Gunthorpe
2019-11-04 22:03         ` John Hubbard
2019-11-05  2:32           ` Jason Gunthorpe
2019-11-07  2:26         ` Ira Weiny
2019-11-03 21:18 ` [PATCH v2 08/18] mm/process_vm_access: set FOLL_PIN via pin_user_pages_remote() John Hubbard
2019-11-04 17:41   ` Jerome Glisse
2019-11-03 21:18 ` [PATCH v2 09/18] drm/via: set FOLL_PIN via pin_user_pages_fast() John Hubbard
2019-11-04 17:44   ` Jerome Glisse
2019-11-04 18:22     ` John Hubbard
2019-11-03 21:18 ` [PATCH v2 10/18] fs/io_uring: set FOLL_PIN via pin_user_pages() John Hubbard
2019-11-03 21:18 ` [PATCH v2 11/18] net/xdp: " John Hubbard
2019-11-03 21:18 ` [PATCH v2 12/18] mm/gup: track FOLL_PIN pages John Hubbard
2019-11-04 18:52   ` Jerome Glisse
2019-11-04 22:49     ` John Hubbard
2019-11-04 23:49       ` Jerome Glisse
2019-11-05  0:18         ` John Hubbard
2019-11-03 21:18 ` [PATCH v2 13/18] media/v4l2-core: pin_longterm_pages (FOLL_PIN) and put_user_page() conversion John Hubbard
2019-11-10 10:11   ` Hans Verkuil
2019-11-03 21:18 ` [PATCH v2 14/18] vfio, mm: " John Hubbard
2019-11-03 21:18 ` [PATCH v2 15/18] powerpc: book3s64: convert to pin_longterm_pages() and put_user_page() John Hubbard
2019-11-03 21:18 ` [PATCH v2 16/18] mm/gup_benchmark: support pin_user_pages() and related calls John Hubbard
2019-11-03 21:18 ` [PATCH v2 17/18] selftests/vm: run_vmtests: invoke gup_benchmark with basic FOLL_PIN coverage John Hubbard
2019-11-03 21:18 ` [PATCH v2 18/18] mm/gup: remove support for gup(FOLL_LONGTERM) John Hubbard

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