From: Leon Romanovsky <leonro@mellanox.com>
To: santosh.shilimkar@oracle.com
Cc: John Hubbard <jhubbard@nvidia.com>,
Andrew Morton <akpm@linux-foundation.org>,
Hans Westgaard Ry <hans.westgaard.ry@oracle.com>,
"David S . Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, rds-devel@oss.oracle.com,
linux-rdma@vger.kernel.org, linux-mm@kvack.org,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/1] net/rds: Track user mapped pages through special API
Date: Wed, 12 Feb 2020 19:51:59 +0200 [thread overview]
Message-ID: <20200212175159.GD679970@unreal> (raw)
In-Reply-To: <c0d8d04e-08d1-60ff-ea4c-e6c71f3e118a@oracle.com>
On Wed, Feb 12, 2020 at 09:31:51AM -0800, santosh.shilimkar@oracle.com wrote:
> On 2/11/20 7:03 PM, John Hubbard wrote:
> > From: Leon Romanovsky <leonro@mellanox.com>
> >
> > Convert net/rds to use the newly introduces pin_user_pages() API,
> > which properly sets FOLL_PIN. Setting FOLL_PIN is now required for
> > code that requires tracking of pinned pages.
> >
> > Note that this effectively changes the code's behavior: it now
> > ultimately calls 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]
> >
> > [1] https://urldefense.com/v3/__https://lore.kernel.org/r/20190723153640.GB720@lst.de__;!!GqivPVa7Brio!OJHuecs9Iup5ig3kQBi_423uMMuskWhBQAdOICrY3UQ_ZfEaxt9ySY7E8y32Q7pk5tByyA$
> >
> > Cc: Hans Westgaard Ry <hans.westgaard.ry@oracle.com>
> > Cc: Santosh Shilimkar <santosh.shilimkar@oracle.com>
> > Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
> > Signed-off-by: John Hubbard <jhubbard@nvidia.com>
> > ---
> Change looks fine to me. Just on safer side, we will try
> to test this change with regression suite to make sure it
> works as expected.
Thanks Santosh,
I wrote this patch before John's series was merged into the tree,
but back then, Hans tested it and it worked, hope that it still works. :)
>
> For patch itself,
>
> Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
>
next prev parent reply other threads:[~2020-02-12 17:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-12 3:03 [PATCH 0/1] net/rds: Track user mapped pages through special API John Hubbard
2020-02-12 3:03 ` [PATCH 1/1] " John Hubbard
2020-02-12 17:31 ` santosh.shilimkar
2020-02-12 17:51 ` Leon Romanovsky [this message]
2020-02-12 17:55 ` santosh.shilimkar
2020-02-17 2:37 ` David Miller
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