linux-kernel - Re: [PATCH] nouveau/hmm: fix migrate zero page to GPU

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Message-ID: <20200520192045.GH24561@mellanox.com>
Date:   Wed, 20 May 2020 16:20:45 -0300
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Ralph Campbell <rcampbell@...dia.com>
Cc:     nouveau@...ts.freedesktop.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jerome Glisse <jglisse@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        Christoph Hellwig <hch@....de>, Ben Skeggs <bskeggs@...hat.com>
Subject: Re: [PATCH] nouveau/hmm: fix migrate zero page to GPU

On Wed, May 20, 2020 at 11:36:52AM -0700, Ralph Campbell wrote:
> When calling OpenCL clEnqueueSVMMigrateMem() on a region of memory that
> is backed by pte_none() or zero pages, migrate_vma_setup() will fill the
> source PFN array with an entry indicating the source page is zero.
> Use this to optimize migration to device private memory by allocating
> GPU memory and zero filling it instead of failing to migrate the page.
> 
> Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
> 
> This patch applies cleanly to Jason's Gunthorpe's hmm tree plus two
> patches I posted earlier. The first is queued in Ben Skegg's nouveau
> tree and the second is still pending review/not queued.
> [1] ("nouveau/hmm: map pages after migration")
> https://lore.kernel.org/linux-mm/20200304001339.8248-5-rcampbell@nvidia.com/
> [2] ("nouveau/hmm: fix nouveau_dmem_chunk allocations")
> https://lore.kernel.org/lkml/20200421231107.30958-1-rcampbell@nvidia.com/

It would be best if it goes through Ben's tree if it doesn't have
conflicts with the hunks I have in the hmm tree.. Is it the case?

Jason