From: Jason Gunthorpe <jgg@ziepe.ca>
To: "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>
Cc: "jean-philippe@linaro.org" <jean-philippe@linaro.org>,
"kevin.tian@intel.com" <kevin.tian@intel.com>,
"chensihang \(A\)" <chensihang1@hisilicon.com>,
David Hildenbrand <david@redhat.com>,
"linux-api@vger.kernel.org" <linux-api@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"zhangfei.gao@linaro.org" <zhangfei.gao@linaro.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Liguozhu \(Kenneth\)" <liguozhu@hisilicon.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC PATCH v3 1/2] mempinfd: Add new syscall to provide memory pin
Date: Tue, 9 Feb 2021 09:53:31 -0400 [thread overview]
Message-ID: <20210209135331.GF4718@ziepe.ca> (raw)
In-Reply-To: <0868d209d7424942a46d1238674cf75d@hisilicon.com>
On Tue, Feb 09, 2021 at 03:01:42AM +0000, Song Bao Hua (Barry Song) wrote:
> On the other hand, wouldn't it be the benefit of hardware accelerators
> to have a lower and more stable latency zip/encryption than CPU?
No, I don't think so.
If this is an important problem then it should apply equally to CPU
and IO jitter.
Honestly I find the idea that occasional migration jitters CPU and DMA
to not be very compelling. Such specialized applications should
allocate special pages to avoid this, not adding an API to be able to
lock down any page
Jason
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next prev parent reply other threads:[~2021-02-09 13:53 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-07 8:18 [RFC PATCH v3 0/2] mempinfd: Add new syscall to provide memory pin Zhou Wang
2021-02-07 8:18 ` [RFC PATCH v3 1/2] " Zhou Wang
2021-02-07 21:34 ` Matthew Wilcox
2021-02-07 22:24 ` Song Bao Hua (Barry Song)
2021-02-08 1:30 ` Matthew Wilcox
2021-02-08 2:27 ` Song Bao Hua (Barry Song)
2021-02-08 8:21 ` David Hildenbrand
2021-02-08 10:13 ` Song Bao Hua (Barry Song)
2021-02-08 10:37 ` David Hildenbrand
2021-02-08 20:52 ` Song Bao Hua (Barry Song)
2021-02-08 2:18 ` David Rientjes via iommu
2021-02-08 5:34 ` Song Bao Hua (Barry Song)
2021-02-07 21:51 ` Arnd Bergmann
2021-02-09 9:27 ` Zhou Wang
2021-02-07 22:02 ` Andy Lutomirski
2021-02-09 9:17 ` Zhou Wang
2021-02-09 9:37 ` Greg KH
2021-02-09 11:58 ` Zhou Wang
2021-02-09 12:01 ` Greg KH
2021-02-09 12:20 ` Zhou Wang
2021-02-10 18:50 ` Matthew Wilcox
2021-02-08 8:14 ` David Hildenbrand
2021-02-08 18:33 ` Jason Gunthorpe
2021-02-08 20:35 ` Song Bao Hua (Barry Song)
2021-02-08 21:30 ` Jason Gunthorpe
2021-02-09 3:01 ` Song Bao Hua (Barry Song)
2021-02-09 13:53 ` Jason Gunthorpe [this message]
2021-02-09 22:22 ` Song Bao Hua (Barry Song)
2021-02-10 18:04 ` Jason Gunthorpe
2021-02-10 21:39 ` Song Bao Hua (Barry Song)
2021-02-11 10:28 ` David Hildenbrand
2021-02-07 8:18 ` [RFC PATCH v3 2/2] selftests/vm: add mempinfd test Zhou Wang
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