From: John Hubbard <jhubbard@nvidia.com>
To: Ira Weiny <ira.weiny@intel.com>
Cc: "Andrew Morton" <akpm@linux-foundation.org>,
"Al Viro" <viro@zeniv.linux.org.uk>,
"Alex Williamson" <alex.williamson@redhat.com>,
"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
"Björn Töpel" <bjorn.topel@intel.com>,
"Christoph Hellwig" <hch@infradead.org>,
"Dan Williams" <dan.j.williams@intel.com>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Dave Chinner" <david@fromorbit.com>,
"David Airlie" <airlied@linux.ie>,
"David S . Miller" <davem@davemloft.net>,
"Jan Kara" <jack@suse.cz>, "Jason Gunthorpe" <jgg@ziepe.ca>,
"Jens Axboe" <axboe@kernel.dk>,
"Jonathan Corbet" <corbet@lwn.net>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Magnus Karlsson" <magnus.karlsson@intel.com>,
"Mauro Carvalho Chehab" <mchehab@kernel.org>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"Michal Hocko" <mhocko@suse.com>,
"Mike Kravetz" <mike.kravetz@oracle.com>,
"Paul Mackerras" <paulus@samba.org>,
"Shuah Khan" <shuah@kernel.org>,
"Vlastimil Babka" <vbabka@suse.cz>,
bpf@vger.kernel.org, dri-devel@lists.freedesktop.org,
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linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org,
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netdev@vger.kernel.org, linux-mm@kvack.org,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 08/19] mm/process_vm_access: set FOLL_PIN via pin_user_pages_remote()
Date: Thu, 31 Oct 2019 16:46:45 -0700 [thread overview]
Message-ID: <7e79d9b5-772e-3628-4a60-65efc2f490c5@nvidia.com> (raw)
In-Reply-To: <20191031233519.GH14771@iweiny-DESK2.sc.intel.com>
On 10/31/19 4:35 PM, Ira Weiny wrote:
> On Wed, Oct 30, 2019 at 03:49:19PM -0700, John Hubbard wrote:
>> Convert process_vm_access to use the new pin_user_pages_remote()
>> call, which sets FOLL_PIN. Setting FOLL_PIN is now required for
>> code that requires tracking of pinned pages.
>>
>> Also, release the pages via put_user_page*().
>>
>> Also, rename "pages" to "pinned_pages", as this makes for
>> easier reading of process_vm_rw_single_vec().
>
> Ok... but it made review a bit harder...
>
Yes, sorry about that. After dealing with "pages means struct page *[]"
for all this time, having an "int pages" just was a step too far for
me here. :)
Thanks for working through it.
thanks,
John Hubbard
NVIDIA
> Reviewed-by: Ira Weiny <ira.weiny@intel.com>
>
>>
>> Signed-off-by: John Hubbard <jhubbard@nvidia.com>
>> ---
>> mm/process_vm_access.c | 28 +++++++++++++++-------------
>> 1 file changed, 15 insertions(+), 13 deletions(-)
>>
>> diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
>> index 357aa7bef6c0..fd20ab675b85 100644
>> --- a/mm/process_vm_access.c
>> +++ b/mm/process_vm_access.c
>> @@ -42,12 +42,11 @@ static int process_vm_rw_pages(struct page **pages,
>> if (copy > len)
>> copy = len;
>>
>> - if (vm_write) {
>> + if (vm_write)
>> copied = copy_page_from_iter(page, offset, copy, iter);
>> - set_page_dirty_lock(page);
>> - } else {
>> + else
>> copied = copy_page_to_iter(page, offset, copy, iter);
>> - }
>> +
>> len -= copied;
>> if (copied < copy && iov_iter_count(iter))
>> return -EFAULT;
>> @@ -96,7 +95,7 @@ static int process_vm_rw_single_vec(unsigned long addr,
>> flags |= FOLL_WRITE;
>>
>> while (!rc && nr_pages && iov_iter_count(iter)) {
>> - int pages = min(nr_pages, max_pages_per_loop);
>> + int pinned_pages = min(nr_pages, max_pages_per_loop);
>> int locked = 1;
>> size_t bytes;
>>
>> @@ -106,14 +105,15 @@ static int process_vm_rw_single_vec(unsigned long addr,
>> * current/current->mm
>> */
>> down_read(&mm->mmap_sem);
>> - pages = get_user_pages_remote(task, mm, pa, pages, flags,
>> - process_pages, NULL, &locked);
>> + pinned_pages = pin_user_pages_remote(task, mm, pa, pinned_pages,
>> + flags, process_pages,
>> + NULL, &locked);
>> if (locked)
>> up_read(&mm->mmap_sem);
>> - if (pages <= 0)
>> + if (pinned_pages <= 0)
>> return -EFAULT;
>>
>> - bytes = pages * PAGE_SIZE - start_offset;
>> + bytes = pinned_pages * PAGE_SIZE - start_offset;
>> if (bytes > len)
>> bytes = len;
>>
>> @@ -122,10 +122,12 @@ static int process_vm_rw_single_vec(unsigned long addr,
>> vm_write);
>> len -= bytes;
>> start_offset = 0;
>> - nr_pages -= pages;
>> - pa += pages * PAGE_SIZE;
>> - while (pages)
>> - put_page(process_pages[--pages]);
>> + nr_pages -= pinned_pages;
>> + pa += pinned_pages * PAGE_SIZE;
>> +
>> + /* If vm_write is set, the pages need to be made dirty: */
>> + put_user_pages_dirty_lock(process_pages, pinned_pages,
>> + vm_write);
>> }
>>
>> return rc;
>> --
>> 2.23.0
>>
next prev parent reply other threads:[~2019-10-31 23:46 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-30 22:49 [PATCH 00/19] mm/gup: track dma-pinned pages: FOLL_PIN, FOLL_LONGTERM John Hubbard
2019-10-30 22:49 ` [PATCH 01/19] mm/gup: pass flags arg to __gup_device_* functions John Hubbard
2019-10-31 18:18 ` Ira Weiny
2019-10-30 22:49 ` [PATCH 02/19] mm/gup: factor out duplicate code from four routines John Hubbard
2019-10-31 18:35 ` Ira Weiny
2019-10-31 18:43 ` John Hubbard
2019-10-31 21:09 ` Ira Weiny
2019-10-31 22:01 ` John Hubbard
2019-10-30 22:49 ` [PATCH 03/19] goldish_pipe: rename local pin_user_pages() routine John Hubbard
2019-10-31 18:36 ` Ira Weiny
2019-10-30 22:49 ` [PATCH 04/19] media/v4l2-core: set pages dirty upon releasing DMA buffers John Hubbard
2019-10-30 22:49 ` [PATCH 05/19] mm/gup: introduce pin_user_pages*() and FOLL_PIN John Hubbard
2019-10-31 23:15 ` Ira Weiny
2019-10-31 23:43 ` John Hubbard
2019-10-30 22:49 ` [PATCH 06/19] goldish_pipe: convert to pin_user_pages() and put_user_page() John Hubbard
2019-10-30 22:49 ` [PATCH 07/19] infiniband: set FOLL_PIN, FOLL_LONGTERM via pin_longterm_pages*() John Hubbard
2019-10-31 23:25 ` Ira Weiny
2019-10-31 23:49 ` John Hubbard
2019-10-30 22:49 ` [PATCH 08/19] mm/process_vm_access: set FOLL_PIN via pin_user_pages_remote() John Hubbard
2019-10-31 23:35 ` Ira Weiny
2019-10-31 23:46 ` John Hubbard [this message]
2019-10-30 22:49 ` [PATCH 09/19] drm/via: set FOLL_PIN via pin_user_pages_fast() John Hubbard
2019-10-31 23:36 ` Ira Weiny
2019-11-04 18:10 ` Daniel Vetter
2019-11-04 19:20 ` John Hubbard
2019-11-05 9:49 ` Daniel Vetter
2019-11-05 18:16 ` John Hubbard
2019-10-30 22:49 ` [PATCH 10/19] fs/io_uring: set FOLL_PIN via pin_user_pages() John Hubbard
2019-10-31 23:37 ` Ira Weiny
2019-11-01 14:49 ` Jens Axboe
2019-10-30 22:49 ` [PATCH 11/19] net/xdp: " John Hubbard
2019-10-31 23:37 ` Ira Weiny
2019-11-02 11:01 ` Björn Töpel
2019-10-30 22:49 ` [PATCH 12/19] mm/gup: track FOLL_PIN pages John Hubbard
2019-10-30 22:49 ` [PATCH 13/19] media/v4l2-core: pin_longterm_pages (FOLL_PIN) and put_user_page() conversion John Hubbard
2019-10-31 23:38 ` Ira Weiny
2019-10-30 22:49 ` [PATCH 14/19] vfio, mm: " John Hubbard
2019-10-30 23:05 ` John Hubbard
2019-10-30 22:49 ` [PATCH 15/19] powerpc: book3s64: convert to pin_longterm_pages() and put_user_page() John Hubbard
2019-10-30 22:49 ` [PATCH 16/19] mm/gup_benchmark: support pin_user_pages() and related calls John Hubbard
2019-10-30 22:49 ` [PATCH 17/19] selftests/vm: run_vmtests: invoke gup_benchmark with basic FOLL_PIN coverage John Hubbard
2019-10-30 22:49 ` [PATCH 18/19] mm/gup: remove support for gup(FOLL_LONGTERM) John Hubbard
2019-10-30 22:49 ` [PATCH 19/19] Documentation/vm: add pin_user_pages.rst John Hubbard
2019-10-31 23:49 ` Ira Weiny
2019-10-31 23:53 ` John Hubbard
2019-11-01 0:48 ` John Hubbard
2019-11-03 19:53 ` John Hubbard
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