From: Balbir Singh <bsingharora@gmail.com> To: Jerome Glisse <jglisse@redhat.com> Cc: lsf-pc@lists.linux-foundation.org, linux-mm <linux-mm@kvack.org>, linux-block@vger.kernel.org, linux-fsdevel <linux-fsdevel@vger.kernel.org> Subject: Re: [LSF/MM TOPIC] Un-addressable device memory and block/fs implications Date: Wed, 14 Dec 2016 14:55:28 +1100 [thread overview] Message-ID: <CAKTCnzkniWn_ayN9LsXzc9GRBQAaq_gqmvWu0-aELUxkCzkXMA@mail.gmail.com> (raw) In-Reply-To: <20161213181511.GB2305@redhat.com> On Wed, Dec 14, 2016 at 5:15 AM, Jerome Glisse <jglisse@redhat.com> wrote: > I would like to discuss un-addressable device memory in the context of > filesystem and block device. Specificaly how to handle write-back, read, > ... when a filesystem page is migrated to device memory that CPU can not > access. > > I intend to post a patchset leveraging the same idea as the existing > block bounce helper (block/bounce.c) to handle this. I believe this is > worth discussing during summit see how people feels about such plan and > if they have better ideas. > > Yes, that would be interesting. I presume all of this is for ZONE_DEVICE and HMM. I think designing such an interface requires careful thought on tracking pages to ensure we don't lose writes and also the impact on things like the writeback subsytem. >From a HMM perspective and an overall MM perspective, I worry that our accounting system is broken with the proposed mirroring and unaddressable memory that needs to be addressed as well. It would also be nice to have a discussion on migration patches currently on the list 1. THP migration 2. HMM migration 3. Async migration > I also like to join discussions on: > - Peer-to-Peer DMAs between PCIe devices > - CDM coherent device memory Yes, this needs discussion. Specifically from is all of CDM memory NORMAL or not and the special requirements we have today for CDM. > - PMEM > - overall mm discussions Balbir Singh.
WARNING: multiple messages have this Message-ID (diff)
From: Balbir Singh <bsingharora@gmail.com> To: Jerome Glisse <jglisse@redhat.com> Cc: lsf-pc@lists.linux-foundation.org, linux-mm <linux-mm@kvack.org>, linux-block@vger.kernel.org, linux-fsdevel <linux-fsdevel@vger.kernel.org> Subject: Re: [LSF/MM TOPIC] Un-addressable device memory and block/fs implications Date: Wed, 14 Dec 2016 14:55:28 +1100 [thread overview] Message-ID: <CAKTCnzkniWn_ayN9LsXzc9GRBQAaq_gqmvWu0-aELUxkCzkXMA@mail.gmail.com> (raw) In-Reply-To: <20161213181511.GB2305@redhat.com> On Wed, Dec 14, 2016 at 5:15 AM, Jerome Glisse <jglisse@redhat.com> wrote: > I would like to discuss un-addressable device memory in the context of > filesystem and block device. Specificaly how to handle write-back, read, > ... when a filesystem page is migrated to device memory that CPU can not > access. > > I intend to post a patchset leveraging the same idea as the existing > block bounce helper (block/bounce.c) to handle this. I believe this is > worth discussing during summit see how people feels about such plan and > if they have better ideas. > > Yes, that would be interesting. I presume all of this is for ZONE_DEVICE and HMM. I think designing such an interface requires careful thought on tracking pages to ensure we don't lose writes and also the impact on things like the writeback subsytem. >From a HMM perspective and an overall MM perspective, I worry that our accounting system is broken with the proposed mirroring and unaddressable memory that needs to be addressed as well. It would also be nice to have a discussion on migration patches currently on the list 1. THP migration 2. HMM migration 3. Async migration > I also like to join discussions on: > - Peer-to-Peer DMAs between PCIe devices > - CDM coherent device memory Yes, this needs discussion. Specifically from is all of CDM memory NORMAL or not and the special requirements we have today for CDM. > - PMEM > - overall mm discussions Balbir Singh. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2016-12-14 3:55 UTC|newest] Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-12-13 18:15 [LSF/MM TOPIC] Un-addressable device memory and block/fs implications Jerome Glisse 2016-12-13 18:15 ` Jerome Glisse 2016-12-13 18:15 ` Jerome Glisse 2016-12-13 18:20 ` James Bottomley 2016-12-13 18:20 ` James Bottomley 2016-12-13 18:20 ` James Bottomley 2016-12-13 18:55 ` Jerome Glisse 2016-12-13 18:55 ` Jerome Glisse 2016-12-13 18:55 ` Jerome Glisse 2016-12-13 20:01 ` James Bottomley 2016-12-13 20:01 ` James Bottomley 2016-12-13 20:22 ` Jerome Glisse 2016-12-13 20:22 ` Jerome Glisse 2016-12-13 20:22 ` Jerome Glisse 2016-12-13 20:27 ` Dave Hansen 2016-12-13 20:27 ` Dave Hansen 2016-12-13 20:15 ` Dave Chinner 2016-12-13 20:15 ` Dave Chinner 2016-12-13 20:31 ` Jerome Glisse 2016-12-13 20:31 ` Jerome Glisse 2016-12-13 20:31 ` Jerome Glisse 2016-12-13 21:10 ` Dave Chinner 2016-12-13 21:10 ` Dave Chinner 2016-12-13 21:24 ` Jerome Glisse 2016-12-13 21:24 ` Jerome Glisse 2016-12-13 21:24 ` Jerome Glisse 2016-12-13 22:08 ` Dave Hansen 2016-12-13 22:08 ` Dave Hansen 2016-12-13 23:02 ` Jerome Glisse 2016-12-13 23:02 ` Jerome Glisse 2016-12-13 23:02 ` Jerome Glisse 2016-12-13 22:13 ` Dave Chinner 2016-12-13 22:13 ` Dave Chinner 2016-12-13 22:55 ` Jerome Glisse 2016-12-13 22:55 ` Jerome Glisse 2016-12-13 22:55 ` Jerome Glisse 2016-12-14 0:14 ` Dave Chinner 2016-12-14 0:14 ` Dave Chinner 2016-12-14 1:07 ` Jerome Glisse 2016-12-14 1:07 ` Jerome Glisse 2016-12-14 1:07 ` Jerome Glisse 2016-12-14 4:23 ` Dave Chinner 2016-12-14 4:23 ` Dave Chinner 2016-12-14 16:35 ` Jerome Glisse 2016-12-14 16:35 ` Jerome Glisse 2016-12-14 16:35 ` Jerome Glisse 2016-12-14 11:13 ` [Lsf-pc] " Jan Kara 2016-12-14 11:13 ` Jan Kara 2016-12-14 17:15 ` Jerome Glisse 2016-12-14 17:15 ` Jerome Glisse 2016-12-14 17:15 ` Jerome Glisse 2016-12-15 16:19 ` Jan Kara 2016-12-15 16:19 ` Jan Kara 2016-12-15 19:14 ` Jerome Glisse 2016-12-15 19:14 ` Jerome Glisse 2016-12-15 19:14 ` Jerome Glisse 2016-12-16 8:14 ` Jan Kara 2016-12-16 8:14 ` Jan Kara 2016-12-16 3:10 ` Aneesh Kumar K.V 2016-12-16 3:10 ` Aneesh Kumar K.V 2016-12-16 3:10 ` Aneesh Kumar K.V 2016-12-19 8:46 ` Jan Kara 2016-12-19 8:46 ` Jan Kara 2016-12-19 17:00 ` Aneesh Kumar K.V 2016-12-19 17:00 ` Aneesh Kumar K.V 2016-12-14 3:55 ` Balbir Singh [this message] 2016-12-14 3:55 ` Balbir Singh 2016-12-16 3:14 ` [LSF/MM ATTEND] " Aneesh Kumar K.V 2016-12-16 3:14 ` Aneesh Kumar K.V 2017-01-16 12:04 ` Anshuman Khandual 2017-01-16 12:04 ` Anshuman Khandual 2017-01-16 23:15 ` John Hubbard 2017-01-16 23:15 ` John Hubbard 2017-01-18 11:00 ` [Lsf-pc] " Jan Kara 2017-01-18 11:00 ` Jan Kara
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