From: Matthew Wilcox <willy@infradead.org>
To: Zhou Wang <wangzhou1@hisilicon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>,
Andy Lutomirski <luto@amacapital.net>,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
linux-api@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
song.bao.hua@hisilicon.com, jgg@ziepe.ca, kevin.tian@intel.com,
jean-philippe@linaro.org, eric.auger@redhat.com,
liguozhu@hisilicon.com, zhangfei.gao@linaro.org,
Sihang Chen <chensihang1@hisilicon.com>
Subject: Re: [RFC PATCH v3 1/2] mempinfd: Add new syscall to provide memory pin
Date: Wed, 10 Feb 2021 18:50:52 +0000 [thread overview]
Message-ID: <20210210185052.GE308988@casper.infradead.org> (raw)
In-Reply-To: <2237506a-0c98-7ba6-5d5f-b60b637174c5@hisilicon.com>
On Tue, Feb 09, 2021 at 08:20:18PM +0800, Zhou Wang wrote:
> Agree, will add it in next version.
No, don't do another version. Jason is right, this approach is wrong.
The point of SVA is that it doesn't require the application to do
anything special. If jitter from too-frequent page migration is actually
a problem, then fix the frequency of page migration. Don't pretend that
this particular application is so important that it prevents the kernel
from doing its housekeeping.
WARNING: multiple messages have this Message-ID (diff)
From: Matthew Wilcox <willy@infradead.org>
To: Zhou Wang <wangzhou1@hisilicon.com>
Cc: jean-philippe@linaro.org, kevin.tian@intel.com,
Sihang Chen <chensihang1@hisilicon.com>,
jgg@ziepe.ca, Greg KH <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
Andy Lutomirski <luto@amacapital.net>,
linux-mm@kvack.org, iommu@lists.linux-foundation.org,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-api@vger.kernel.org, zhangfei.gao@linaro.org,
Andrew Morton <akpm@linux-foundation.org>,
liguozhu@hisilicon.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH v3 1/2] mempinfd: Add new syscall to provide memory pin
Date: Wed, 10 Feb 2021 18:50:52 +0000 [thread overview]
Message-ID: <20210210185052.GE308988@casper.infradead.org> (raw)
In-Reply-To: <2237506a-0c98-7ba6-5d5f-b60b637174c5@hisilicon.com>
On Tue, Feb 09, 2021 at 08:20:18PM +0800, Zhou Wang wrote:
> Agree, will add it in next version.
No, don't do another version. Jason is right, this approach is wrong.
The point of SVA is that it doesn't require the application to do
anything special. If jitter from too-frequent page migration is actually
a problem, then fix the frequency of page migration. Don't pretend that
this particular application is so important that it prevents the kernel
from doing its housekeeping.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
WARNING: multiple messages have this Message-ID (diff)
From: Matthew Wilcox <willy@infradead.org>
To: Zhou Wang <wangzhou1@hisilicon.com>
Cc: song.bao.hua@hisilicon.com, jean-philippe@linaro.org,
kevin.tian@intel.com, Sihang Chen <chensihang1@hisilicon.com>,
jgg@ziepe.ca, Greg KH <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org,
Andy Lutomirski <luto@amacapital.net>,
linux-mm@kvack.org, iommu@lists.linux-foundation.org,
Alexander Viro <viro@zeniv.linux.org.uk>,
eric.auger@redhat.com, linux-api@vger.kernel.org,
zhangfei.gao@linaro.org,
Andrew Morton <akpm@linux-foundation.org>,
liguozhu@hisilicon.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH v3 1/2] mempinfd: Add new syscall to provide memory pin
Date: Wed, 10 Feb 2021 18:50:52 +0000 [thread overview]
Message-ID: <20210210185052.GE308988@casper.infradead.org> (raw)
In-Reply-To: <2237506a-0c98-7ba6-5d5f-b60b637174c5@hisilicon.com>
On Tue, Feb 09, 2021 at 08:20:18PM +0800, Zhou Wang wrote:
> Agree, will add it in next version.
No, don't do another version. Jason is right, this approach is wrong.
The point of SVA is that it doesn't require the application to do
anything special. If jitter from too-frequent page migration is actually
a problem, then fix the frequency of page migration. Don't pretend that
this particular application is so important that it prevents the kernel
from doing its housekeeping.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-02-10 18:55 UTC|newest]
Thread overview: 119+ 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 ` Zhou Wang
2021-02-07 8:18 ` Zhou Wang
2021-02-07 8:18 ` [RFC PATCH v3 1/2] " Zhou Wang
2021-02-07 8:18 ` Zhou Wang
2021-02-07 8:18 ` Zhou Wang
2021-02-07 10:51 ` kernel test robot
2021-02-07 10:59 ` kernel test robot
2021-02-07 21:34 ` Matthew Wilcox
2021-02-07 21:34 ` Matthew Wilcox
2021-02-07 21:34 ` Matthew Wilcox
2021-02-07 22:24 ` Song Bao Hua (Barry Song)
2021-02-07 22:24 ` Song Bao Hua (Barry Song)
2021-02-07 22:24 ` Song Bao Hua (Barry Song)
2021-02-07 22:24 ` Song Bao Hua (Barry Song)
2021-02-08 1:30 ` Matthew Wilcox
2021-02-08 1:30 ` Matthew Wilcox
2021-02-08 1:30 ` Matthew Wilcox
2021-02-08 1:30 ` Matthew Wilcox
2021-02-08 2:27 ` Song Bao Hua (Barry Song)
2021-02-08 2:27 ` Song Bao Hua (Barry Song)
2021-02-08 2:27 ` Song Bao Hua (Barry Song)
2021-02-08 2:27 ` Song Bao Hua (Barry Song)
2021-02-08 3:46 ` Hillf Danton
2021-02-08 8:21 ` David Hildenbrand
2021-02-08 8:21 ` David Hildenbrand
2021-02-08 8:21 ` David Hildenbrand
2021-02-08 8:21 ` David Hildenbrand
2021-02-08 10:13 ` Song Bao Hua (Barry Song)
2021-02-08 10:13 ` Song Bao Hua (Barry Song)
2021-02-08 10:13 ` Song Bao Hua (Barry Song)
2021-02-08 10:13 ` Song Bao Hua (Barry Song)
2021-02-08 10:37 ` David Hildenbrand
2021-02-08 10:37 ` David Hildenbrand
2021-02-08 10:37 ` David Hildenbrand
2021-02-08 10:37 ` David Hildenbrand
2021-02-08 20:52 ` Song Bao Hua (Barry Song)
2021-02-08 20:52 ` Song Bao Hua (Barry Song)
2021-02-08 20:52 ` Song Bao Hua (Barry Song)
2021-02-08 20:52 ` Song Bao Hua (Barry Song)
2021-02-08 2:18 ` David Rientjes
2021-02-08 2:18 ` David Rientjes
2021-02-08 2:18 ` David Rientjes via iommu
2021-02-08 2:18 ` David Rientjes
2021-02-08 5:34 ` Song Bao Hua (Barry Song)
2021-02-08 5:34 ` Song Bao Hua (Barry Song)
2021-02-08 5:34 ` Song Bao Hua (Barry Song)
2021-02-08 5:34 ` Song Bao Hua (Barry Song)
2021-02-09 9:02 ` Zhou Wang
2021-02-09 9:02 ` Zhou Wang
2021-02-07 21:51 ` Arnd Bergmann
2021-02-07 21:51 ` Arnd Bergmann
2021-02-07 21:51 ` Arnd Bergmann
2021-02-07 21:51 ` Arnd Bergmann
2021-02-09 9:27 ` Zhou Wang
2021-02-09 9:27 ` Zhou Wang
2021-02-09 9:27 ` Zhou Wang
2021-02-07 22:02 ` Andy Lutomirski
2021-02-07 22:02 ` Andy Lutomirski
2021-02-07 22:02 ` Andy Lutomirski
2021-02-09 9:17 ` Zhou Wang
2021-02-09 9:17 ` Zhou Wang
2021-02-09 9:17 ` Zhou Wang
2021-02-09 9:37 ` Greg KH
2021-02-09 9:37 ` Greg KH
2021-02-09 9:37 ` Greg KH
2021-02-09 11:58 ` Zhou Wang
2021-02-09 11:58 ` Zhou Wang
2021-02-09 11:58 ` Zhou Wang
2021-02-09 12:01 ` Greg KH
2021-02-09 12:01 ` Greg KH
2021-02-09 12:01 ` Greg KH
2021-02-09 12:20 ` Zhou Wang
2021-02-09 12:20 ` Zhou Wang
2021-02-09 12:20 ` Zhou Wang
2021-02-10 18:50 ` Matthew Wilcox [this message]
2021-02-10 18:50 ` Matthew Wilcox
2021-02-10 18:50 ` Matthew Wilcox
2021-02-08 8:14 ` David Hildenbrand
2021-02-08 8:14 ` David Hildenbrand
2021-02-08 8:14 ` David Hildenbrand
2021-02-08 18:33 ` Jason Gunthorpe
2021-02-08 18:33 ` Jason Gunthorpe
2021-02-08 18:33 ` Jason Gunthorpe
2021-02-08 20:35 ` Song Bao Hua (Barry Song)
2021-02-08 20:35 ` Song Bao Hua (Barry Song)
2021-02-08 20:35 ` Song Bao Hua (Barry Song)
2021-02-08 20:35 ` Song Bao Hua (Barry Song)
2021-02-08 21:30 ` Jason Gunthorpe
2021-02-08 21:30 ` Jason Gunthorpe
2021-02-08 21:30 ` Jason Gunthorpe
2021-02-08 21:30 ` Jason Gunthorpe
2021-02-09 3:01 ` Song Bao Hua (Barry Song)
2021-02-09 3:01 ` Song Bao Hua (Barry Song)
2021-02-09 3:01 ` Song Bao Hua (Barry Song)
2021-02-09 3:01 ` Song Bao Hua (Barry Song)
2021-02-09 13:53 ` Jason Gunthorpe
2021-02-09 13:53 ` Jason Gunthorpe
2021-02-09 13:53 ` Jason Gunthorpe
2021-02-09 13:53 ` Jason Gunthorpe
2021-02-09 22:22 ` Song Bao Hua (Barry Song)
2021-02-09 22:22 ` Song Bao Hua (Barry Song)
2021-02-09 22:22 ` Song Bao Hua (Barry Song)
2021-02-09 22:22 ` Song Bao Hua (Barry Song)
2021-02-10 18:04 ` Jason Gunthorpe
2021-02-10 18:04 ` Jason Gunthorpe
2021-02-10 18:04 ` Jason Gunthorpe
2021-02-10 18:04 ` Jason Gunthorpe
2021-02-10 21:39 ` Song Bao Hua (Barry Song)
2021-02-10 21:39 ` Song Bao Hua (Barry Song)
2021-02-10 21:39 ` Song Bao Hua (Barry Song)
2021-02-10 21:39 ` Song Bao Hua (Barry Song)
2021-02-11 10:28 ` David Hildenbrand
2021-02-11 10:28 ` David Hildenbrand
2021-02-11 10:28 ` David Hildenbrand
2021-02-11 10:28 ` David Hildenbrand
2021-02-07 8:18 ` [RFC PATCH v3 2/2] selftests/vm: add mempinfd test Zhou Wang
2021-02-07 8:18 ` Zhou Wang
2021-02-07 8:18 ` Zhou Wang
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