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From: Christoph Hellwig <hch@lst.de>
To: Felix Kuehling <felix.kuehling@gmail.com>
Cc: felix.kuehling@amd.com, akpm@linux-foundation.org,
	linux-mm@kvack.org, hch@lst.de, jglisse@redhat.com,
	jgg@nvidia.com, dri-devel@lists.freedesktop.org,
	amd-gfx@lists.freedesktop.org, Alex Sierra <alex.sierra@amd.com>
Subject: Re: [RFC PATCH 5/5] mm: changes to unref pages with Generic type
Date: Sat, 29 May 2021 08:42:27 +0200	[thread overview]
Message-ID: <20210529064227.GD15834@lst.de> (raw)
In-Reply-To: <20210527230809.3701-6-Felix.Kuehling@amd.com>

On Thu, May 27, 2021 at 07:08:09PM -0400, Felix Kuehling wrote:
> From: Alex Sierra <alex.sierra@amd.com>
> 
> pages in device mapping refcounts are 1-based, instead
> of 0-based. If refcount 1, means it can be freed.
> This logic is not set for Generic memory type. Therefore,
> its release is threated as a normal page, instead of
> the callback device driver release it.

So we really need to stop this magic one off refcount.  We had a WIP
patchset to do that, and we need to finish that off instad of piling on
more hacks.


  reply	other threads:[~2021-05-29  6:42 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-27 23:08 [RFC PATCH 0/5] Support DEVICE_GENERIC memory in migrate_vma_* Felix Kuehling
2021-05-27 23:08 ` [RFC PATCH 1/5] drm/amdkfd: add SPM support for SVM Felix Kuehling
2021-05-29  6:38   ` Christoph Hellwig
2021-05-29 18:42     ` Felix Kuehling
2021-05-27 23:08 ` [RFC PATCH 2/5] drm/amdkfd: generic type as sys mem on migration to ram Felix Kuehling
2021-05-27 23:08 ` [RFC PATCH 3/5] include/linux/mm.h: helper to check zone device generic type Felix Kuehling
2021-05-27 23:08 ` [RFC PATCH 4/5] mm: add generic type support for device zone page migration Felix Kuehling
2021-05-29  6:40   ` Christoph Hellwig
2021-05-27 23:08 ` [RFC PATCH 5/5] mm: changes to unref pages with Generic type Felix Kuehling
2021-05-29  6:42   ` Christoph Hellwig [this message]
2021-05-29 18:44     ` Felix Kuehling
2021-05-28 13:08 ` [RFC PATCH 0/5] Support DEVICE_GENERIC memory in migrate_vma_* Jason Gunthorpe
2021-05-28 15:56   ` Felix Kuehling
2021-05-29  6:41     ` Christoph Hellwig
2021-05-29 18:37       ` Felix Kuehling

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