From: Christopher Lameter <cl@linux.com>
To: Jerome Glisse <jglisse@redhat.com>
Cc: "Jason Gunthorpe" <jgg@ziepe.ca>,
"Leon Romanovsky" <leon@kernel.org>,
"Kenneth Lee" <liguozhu@hisilicon.com>,
"Tim Sell" <timothy.sell@unisys.com>,
linux-doc@vger.kernel.org,
"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
"Zaibo Xu" <xuzaibo@huawei.com>,
zhangfei.gao@foxmail.com, linuxarm@huawei.com,
haojian.zhuang@linaro.org, "Hao Fang" <fanghao11@huawei.com>,
"Gavin Schenk" <g.schenk@eckelmann.de>,
"RDMA mailing list" <linux-rdma@vger.kernel.org>,
"Zhou Wang" <wangzhou1@hisilicon.com>,
"Doug Ledford" <dledford@redhat.com>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
"David Kershner" <david.kershner@unisys.com>,
"Kenneth Lee" <nek.in.cn@gmail.com>,
"Johan Hovold" <johan@kernel.org>,
"Cyrille Pitchen" <cyrille.pitchen@free-electrons.com>,
"Sagar Dharia" <sdharia@codeaurora.org>,
"Jens Axboe" <axboe@kernel.dk>,
guodong.xu@linaro.org, linux-netdev <netdev@vger.kernel.org>,
"Randy Dunlap" <rdunlap@infradead.org>,
linux-kernel@vger.kernel.org, "Vinod Koul" <vkoul@kernel.org>,
linux-crypto@vger.kernel.org,
"Philippe Ombredanne" <pombredanne@nexb.com>,
"Sanyog Kale" <sanyog.r.kale@intel.com>,
"David S. Miller" <davem@davemloft.net>,
linux-accelerators@lists.ozlabs.org
Subject: Re: [RFCv3 PATCH 1/6] uacce: Add documents for WarpDrive/uacce
Date: Mon, 19 Nov 2018 19:19:04 +0000 [thread overview]
Message-ID: <010001672d69716a-743e5098-eb2f-41ca-bf98-6e17eaaba00f-000000@email.amazonses.com> (raw)
In-Reply-To: <20181119184215.GB4593@redhat.com>
On Mon, 19 Nov 2018, Jerome Glisse wrote:
> > IIRC this is solved in IB by automatically calling
> > madvise(MADV_DONTFORK) before creating the MR.
> >
> > MADV_DONTFORK
> > .. This is useful to prevent copy-on-write semantics from changing the
> > physical location of a page if the parent writes to it after a
> > fork(2) ..
>
> This would work around the issue but this is not transparent ie
> range marked with DONTFORK no longer behave as expected from the
> application point of view.
Why would anyone expect a range registered via MR behave as normal? Device
I/O is going on into that range. Memory is already special.
> Also it relies on userspace doing the right thing (which is not
> something i usualy trust :)).
This has been established practice for 15 or so years in a couple of use
cases. Again user space already has to be doing special things in order to
handle RDMA is that area.
next prev parent reply other threads:[~2018-11-19 19:19 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-12 7:58 [RFCv3 PATCH 0/6] A General Accelerator Framework, WarpDrive Kenneth Lee
2018-11-12 7:58 ` [RFCv3 PATCH 1/6] uacce: Add documents for WarpDrive/uacce Kenneth Lee
2018-11-13 0:23 ` Leon Romanovsky
2018-11-14 2:58 ` Kenneth Lee
2018-11-14 16:00 ` Leon Romanovsky
2018-11-15 8:51 ` Kenneth Lee
2018-11-15 14:54 ` Leon Romanovsky
2018-11-19 9:14 ` Kenneth Lee
2018-11-19 9:19 ` Kenneth Lee
2018-11-19 10:48 ` Leon Romanovsky
2018-11-19 16:48 ` Jerome Glisse
2018-11-19 18:27 ` Jason Gunthorpe
2018-11-19 18:42 ` Jerome Glisse
2018-11-19 18:53 ` Jason Gunthorpe
2018-11-19 19:17 ` Jerome Glisse
2018-11-19 19:27 ` Jason Gunthorpe
2018-11-19 19:46 ` Jerome Glisse
2018-11-19 20:11 ` Jason Gunthorpe
2018-11-19 20:26 ` Jerome Glisse
2018-11-19 21:26 ` Jason Gunthorpe
2018-11-19 21:33 ` Jerome Glisse
2018-11-19 21:41 ` Jason Gunthorpe
2018-11-19 19:02 ` Leon Romanovsky
2018-11-19 19:19 ` Christopher Lameter [this message]
2018-11-19 19:25 ` Jerome Glisse
2018-11-20 2:30 ` Kenneth Lee
2018-11-27 2:52 ` Kenneth Lee
2018-11-19 18:49 ` Jason Gunthorpe
2018-11-20 3:07 ` Kenneth Lee
2018-11-20 3:29 ` Jason Gunthorpe
2018-11-20 9:16 ` Jonathan Cameron
2018-11-20 12:19 ` Jean-Philippe Brucker
2018-11-21 6:08 ` Kenneth Lee
2018-11-22 2:58 ` Jason Gunthorpe
2018-11-23 8:02 ` Kenneth Lee
2018-11-23 18:05 ` Jason Gunthorpe
2018-11-24 4:13 ` Kenneth Lee
2018-11-20 5:17 ` Leon Romanovsky
2018-11-21 3:02 ` Kenneth Lee
2018-11-12 7:58 ` [RFCv3 PATCH 2/6] uacce: add uacce module Kenneth Lee
2018-11-12 7:58 ` [RFCv3 PATCH 3/6] crypto/hisilicon: add hisilicon Queue Manager driver Kenneth Lee
2018-11-12 7:58 ` [RFCv3 PATCH 4/6] crypto/hisilicon: add Hisilicon zip driver Kenneth Lee
2018-11-12 7:58 ` [RFCv3 PATCH 5/6] crypto: add uacce support to Hisilicon qm Kenneth Lee
2018-11-12 7:58 ` [RFCv3 PATCH 6/6] uacce: add user sample for uacce/warpdrive Kenneth Lee
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