[v1] RE: [RFC PATCH 0/6] Supporting GMEM (generalized memory management) for external memory devices

RE: [RFC PATCH 0/6] Supporting GMEM (generalized memory management) for external memory devices

Posted by zhuweixi 2 years ago

Thanks! I am planning to present GMEM in Linux MM Alignment Sessions so I can collect more input from the mm developers.

@Christian @Oak I will also send you invitations once a presentation is scheduled. :)

-Weixi

-----Original Message-----
From: David Hildenbrand <david@redhat.com> 
Sent: Thursday, November 30, 2023 10:55 PM
To: zhuweixi <weixi.zhu@huawei.com>; Dave Airlie <airlied@gmail.com>; Christian König <christian.koenig@amd.com>
Cc: linux-mm@kvack.org; linux-kernel@vger.kernel.org; akpm@linux-foundation.org; weixi.zhu@openeuler.sh; mgorman@suse.de; jglisse@redhat.com; rcampbell@nvidia.com; jhubbard@nvidia.com; apopple@nvidia.com; mhairgrove@nvidia.com; ziy@nvidia.com; alexander.deucher@amd.com; Xinhui.Pan@amd.com; amd-gfx@lists.freedesktop.org; Felix.Kuehling@amd.com; ogabbay@kernel.org; dri-devel@lists.freedesktop.org; jgg@nvidia.com; leonro@nvidia.com; zhenyuw@linux.intel.com; zhi.a.wang@intel.com; intel-gvt-dev@lists.freedesktop.org; intel-gfx@lists.freedesktop.org; jani.nikula@linux.intel.com; joonas.lahtinen@linux.intel.com; rodrigo.vivi@intel.com; tvrtko.ursulin@linux.intel.com
Subject: Re: [RFC PATCH 0/6] Supporting GMEM (generalized memory management) for external memory devices

On 29.11.23 09:27, zhuweixi wrote:
> Glad to hear that more sharable code is desirable.
> IMHO, for a common MM subsystem, it is more beneficial for GMEM to 
> extend core MM instead of building a separate one.

More core-mm complexity, awesome, we all love that! ;)

--
Cheers,

David / dhildenb

Re: [RFC PATCH 0/6] Supporting GMEM (generalized memory management) for external memory devices

Posted by David Hildenbrand 2 years ago

On 01.12.23 03:44, zhuweixi wrote:
> Thanks!

I hope you understood that that was a joke :)

> I am planning to present GMEM in Linux MM Alignment Sessions so I can collect more input from the mm developers.

Sounds good. But please try inviting key HMM/driver developer as well.

Most of the core-mm folks attending that meeting are not that familiar 
with these concepts and they are usually not happy about:

(1) More core-MM complexity for things that can be neatly handled in
     separate subsystems with the existing infrastructure already.

(2) One new way of doing things why the other things remain in place.

(3) New MMAP flags. Usually you have a hard time getting this in.
     Sometimes, there are other ways (e.g., special-purpose file-
     systems).

(4) Changing controversial core-mm design decisions to handle corner
     cases.

-- 
Cheers,

David / dhildenb