From: Jan Kara <jack@suse.cz>
To: John Hubbard <jhubbard@nvidia.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>,
"Ira Weiny" <ira.weiny@intel.com>, "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,
kvm@vger.kernel.org, linux-block@vger.kernel.org,
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 v5 11/24] goldish_pipe: convert to pin_user_pages() and put_user_page()
Date: Mon, 18 Nov 2019 11:16:58 +0100 [thread overview]
Message-ID: <20191118101658.GG17319@quack2.suse.cz> (raw)
In-Reply-To: <20191115055340.1825745-12-jhubbard@nvidia.com>
On Thu 14-11-19 21:53:27, John Hubbard wrote:
> 1. Call the new global pin_user_pages_fast(), from pin_goldfish_pages().
>
> 2. As required by pin_user_pages(), release these pages via
> put_user_page(). In this case, do so via put_user_pages_dirty_lock().
>
> That has the side effect of calling set_page_dirty_lock(), instead
> of set_page_dirty(). This is probably more accurate.
>
> As Christoph Hellwig put it, "set_page_dirty() is only safe if we are
> dealing with a file backed page where we have reference on the inode it
> hangs off." [1]
>
> Another side effect is that the release code is simplified because
> the page[] loop is now in gup.c instead of here, so just delete the
> local release_user_pages() entirely, and call
> put_user_pages_dirty_lock() directly, instead.
>
> [1] https://lore.kernel.org/r/20190723153640.GB720@lst.de
>
> Reviewed-by: Ira Weiny <ira.weiny@intel.com>
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Looks good to me. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
> ---
> drivers/platform/goldfish/goldfish_pipe.c | 17 +++--------------
> 1 file changed, 3 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
> index 7ed2a21a0bac..635a8bc1b480 100644
> --- a/drivers/platform/goldfish/goldfish_pipe.c
> +++ b/drivers/platform/goldfish/goldfish_pipe.c
> @@ -274,7 +274,7 @@ static int pin_goldfish_pages(unsigned long first_page,
> *iter_last_page_size = last_page_size;
> }
>
> - ret = get_user_pages_fast(first_page, requested_pages,
> + ret = pin_user_pages_fast(first_page, requested_pages,
> !is_write ? FOLL_WRITE : 0,
> pages);
> if (ret <= 0)
> @@ -285,18 +285,6 @@ static int pin_goldfish_pages(unsigned long first_page,
> return ret;
> }
>
> -static void release_user_pages(struct page **pages, int pages_count,
> - int is_write, s32 consumed_size)
> -{
> - int i;
> -
> - for (i = 0; i < pages_count; i++) {
> - if (!is_write && consumed_size > 0)
> - set_page_dirty(pages[i]);
> - put_page(pages[i]);
> - }
> -}
> -
> /* Populate the call parameters, merging adjacent pages together */
> static void populate_rw_params(struct page **pages,
> int pages_count,
> @@ -372,7 +360,8 @@ static int transfer_max_buffers(struct goldfish_pipe *pipe,
>
> *consumed_size = pipe->command_buffer->rw_params.consumed_size;
>
> - release_user_pages(pipe->pages, pages_count, is_write, *consumed_size);
> + put_user_pages_dirty_lock(pipe->pages, pages_count,
> + !is_write && *consumed_size > 0);
>
> mutex_unlock(&pipe->lock);
> return 0;
> --
> 2.24.0
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
next prev parent reply other threads:[~2019-11-18 12:01 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-15 5:53 [PATCH v5 00/24] mm/gup: track dma-pinned pages: FOLL_PIN John Hubbard
2019-11-15 5:53 ` [PATCH v5 01/24] mm/gup: pass flags arg to __gup_device_* functions John Hubbard
2019-11-15 5:53 ` [PATCH v5 02/24] mm/gup: factor out duplicate code from four routines John Hubbard
2019-11-18 9:46 ` Jan Kara
2019-11-19 7:00 ` John Hubbard
2019-11-15 5:53 ` [PATCH v5 03/24] mm/gup: move try_get_compound_head() to top, fix minor issues John Hubbard
2019-11-15 5:53 ` [PATCH v5 04/24] mm: Cleanup __put_devmap_managed_page() vs ->page_free() John Hubbard
2019-11-15 5:53 ` [PATCH v5 05/24] mm: devmap: refactor 1-based refcounting for ZONE_DEVICE pages John Hubbard
2019-11-15 5:53 ` [PATCH v5 06/24] goldish_pipe: rename local pin_user_pages() routine John Hubbard
2019-11-18 9:47 ` Jan Kara
2019-11-15 5:53 ` [PATCH v5 07/24] IB/umem: use get_user_pages_fast() to pin DMA pages John Hubbard
2019-11-18 9:49 ` Jan Kara
2019-11-15 5:53 ` [PATCH v5 08/24] media/v4l2-core: set pages dirty upon releasing DMA buffers John Hubbard
2019-11-15 5:53 ` [PATCH v5 09/24] vfio, mm: fix get_user_pages_remote() and FOLL_LONGTERM John Hubbard
2019-11-15 14:08 ` Jason Gunthorpe
2019-11-15 18:06 ` Ira Weiny
2019-11-15 5:53 ` [PATCH v5 10/24] mm/gup: introduce pin_user_pages*() and FOLL_PIN John Hubbard
2019-11-18 10:16 ` Jan Kara
2019-11-19 5:17 ` John Hubbard
2019-11-15 5:53 ` [PATCH v5 11/24] goldish_pipe: convert to pin_user_pages() and put_user_page() John Hubbard
2019-11-18 10:16 ` Jan Kara [this message]
2019-11-15 5:53 ` [PATCH v5 12/24] IB/{core,hw,umem}: set FOLL_PIN via pin_user_pages*(), fix up ODP John Hubbard
2019-11-15 14:09 ` Jason Gunthorpe
2019-11-15 5:53 ` [PATCH v5 13/24] mm/process_vm_access: set FOLL_PIN via pin_user_pages_remote() John Hubbard
2019-11-18 10:30 ` Jan Kara
2019-11-15 5:53 ` [PATCH v5 14/24] drm/via: set FOLL_PIN via pin_user_pages_fast() John Hubbard
2019-11-15 5:53 ` [PATCH v5 15/24] fs/io_uring: set FOLL_PIN via pin_user_pages() John Hubbard
2019-11-18 10:34 ` Jan Kara
2019-11-15 5:53 ` [PATCH v5 16/24] net/xdp: " John Hubbard
2019-11-15 5:53 ` [PATCH v5 17/24] mm/gup: track FOLL_PIN pages John Hubbard
2019-11-18 11:58 ` Jan Kara
2019-11-19 0:22 ` John Hubbard
2019-11-15 5:53 ` [PATCH v5 18/24] media/v4l2-core: pin_user_pages (FOLL_PIN) and put_user_page() conversion John Hubbard
2019-11-15 5:53 ` [PATCH v5 19/24] vfio, mm: " John Hubbard
2019-11-15 5:53 ` [PATCH v5 20/24] powerpc: book3s64: convert to pin_user_pages() and put_user_page() John Hubbard
2019-11-15 5:53 ` [PATCH v5 21/24] mm/gup_benchmark: use proper FOLL_WRITE flags instead of hard-coding "1" John Hubbard
2019-11-15 5:53 ` [PATCH v5 22/24] mm/gup_benchmark: support pin_user_pages() and related calls John Hubbard
2019-11-15 5:53 ` [PATCH v5 23/24] selftests/vm: run_vmtests: invoke gup_benchmark with basic FOLL_PIN coverage John Hubbard
2019-11-15 5:53 ` [PATCH v5 24/24] mm, tree-wide: rename put_user_page*() to unpin_user_page*() John Hubbard
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