From: Jason Gunthorpe <jgg@ziepe.ca>
To: Jerome Glisse <jglisse@redhat.com>,
Ralph Campbell <rcampbell@nvidia.com>,
Felix.Kuehling@amd.com
Cc: linux-mm@kvack.org, John Hubbard <jhubbard@nvidia.com>,
dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org,
Christoph Hellwig <hch@lst.de>, Philip Yang <Philip.Yang@amd.com>
Subject: Re: [PATCH hmm 0/8] Various error case bug fixes for hmm_range_fault()
Date: Mon, 16 Mar 2020 15:25:40 -0300 [thread overview]
Message-ID: <20200316182540.GA21434@ziepe.ca> (raw)
In-Reply-To: <20200311183506.3997-1-jgg@ziepe.ca>
On Wed, Mar 11, 2020 at 03:34:58PM -0300, Jason Gunthorpe wrote:
> From: Jason Gunthorpe <jgg@mellanox.com>
>
> The hmm_range_fault() flow is fairly complicated. The scheme allows the
> caller to specify if it needs a usable result for each page, or if it only
> needs the current page table status filled in. This mixture of behavior is
> useful for a caller that wants to build a 'prefetch around fault'
> algorithm.
>
> Although we have no in-tree users of this capability, I am working on
> having RDMA ODP work in this manner, and removing these bugs from
> hmm_range_fault() is a necessary step.
>
> The basic principles are:
>
> - If the caller did not ask for a VA to be valid then hmm_range_fault()
> should not fail because of that VA
>
> - If 0 is returned from hmm_range_fault() then the entire pfns array
> contains valid data
>
> - HMM_PFN_ERROR is set if faulting fails, or if asking for faulting
> would fail
>
> - A 0 return from hmm_range_fault() does not have HMM_PFN_ERROR in any
> VA's the caller asked to be valid
>
> This series does not get there completely, I have a followup series
> closing some more complex cases.
>
> I tested this series using Ralph's hmm tester he posted a while back,
> other testing would be appreciated.
>
> Jason Gunthorpe (8):
> mm/hmm: add missing unmaps of the ptep during hmm_vma_handle_pte()
> mm/hmm: do not call hmm_vma_walk_hole() while holding a spinlock
> mm/hmm: add missing pfns set to hmm_vma_walk_pmd()
> mm/hmm: add missing call to hmm_range_need_fault() before returning
> EFAULT
> mm/hmm: reorganize how !pte_present is handled in hmm_vma_handle_pte()
> mm/hmm: return -EFAULT when setting HMM_PFN_ERROR on requested valid
> pages
> mm/hmm: add missing call to hmm_pte_need_fault in HMM_PFN_SPECIAL
> handling
> mm/hmm: do not check pmd_protnone twice in hmm_vma_handle_pmd()
I moved these toward linux-next, if others have remarks or tags please
feel free to continue.
> mm/hmm: don't free the cached pgmap while scanning
I will respin
Thank you all for the reviews!
Regards,
Jason
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgg@ziepe.ca>
To: Jerome Glisse <jglisse@redhat.com>,
Ralph Campbell <rcampbell@nvidia.com>,
Felix.Kuehling@amd.com
Cc: Philip Yang <Philip.Yang@amd.com>,
John Hubbard <jhubbard@nvidia.com>,
amd-gfx@lists.freedesktop.org, linux-mm@kvack.org,
dri-devel@lists.freedesktop.org, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH hmm 0/8] Various error case bug fixes for hmm_range_fault()
Date: Mon, 16 Mar 2020 15:25:40 -0300 [thread overview]
Message-ID: <20200316182540.GA21434@ziepe.ca> (raw)
In-Reply-To: <20200311183506.3997-1-jgg@ziepe.ca>
On Wed, Mar 11, 2020 at 03:34:58PM -0300, Jason Gunthorpe wrote:
> From: Jason Gunthorpe <jgg@mellanox.com>
>
> The hmm_range_fault() flow is fairly complicated. The scheme allows the
> caller to specify if it needs a usable result for each page, or if it only
> needs the current page table status filled in. This mixture of behavior is
> useful for a caller that wants to build a 'prefetch around fault'
> algorithm.
>
> Although we have no in-tree users of this capability, I am working on
> having RDMA ODP work in this manner, and removing these bugs from
> hmm_range_fault() is a necessary step.
>
> The basic principles are:
>
> - If the caller did not ask for a VA to be valid then hmm_range_fault()
> should not fail because of that VA
>
> - If 0 is returned from hmm_range_fault() then the entire pfns array
> contains valid data
>
> - HMM_PFN_ERROR is set if faulting fails, or if asking for faulting
> would fail
>
> - A 0 return from hmm_range_fault() does not have HMM_PFN_ERROR in any
> VA's the caller asked to be valid
>
> This series does not get there completely, I have a followup series
> closing some more complex cases.
>
> I tested this series using Ralph's hmm tester he posted a while back,
> other testing would be appreciated.
>
> Jason Gunthorpe (8):
> mm/hmm: add missing unmaps of the ptep during hmm_vma_handle_pte()
> mm/hmm: do not call hmm_vma_walk_hole() while holding a spinlock
> mm/hmm: add missing pfns set to hmm_vma_walk_pmd()
> mm/hmm: add missing call to hmm_range_need_fault() before returning
> EFAULT
> mm/hmm: reorganize how !pte_present is handled in hmm_vma_handle_pte()
> mm/hmm: return -EFAULT when setting HMM_PFN_ERROR on requested valid
> pages
> mm/hmm: add missing call to hmm_pte_need_fault in HMM_PFN_SPECIAL
> handling
> mm/hmm: do not check pmd_protnone twice in hmm_vma_handle_pmd()
I moved these toward linux-next, if others have remarks or tags please
feel free to continue.
> mm/hmm: don't free the cached pgmap while scanning
I will respin
Thank you all for the reviews!
Regards,
Jason
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgg@ziepe.ca>
To: Jerome Glisse <jglisse@redhat.com>,
Ralph Campbell <rcampbell@nvidia.com>,
Felix.Kuehling@amd.com
Cc: Philip Yang <Philip.Yang@amd.com>,
John Hubbard <jhubbard@nvidia.com>,
amd-gfx@lists.freedesktop.org, linux-mm@kvack.org,
dri-devel@lists.freedesktop.org, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH hmm 0/8] Various error case bug fixes for hmm_range_fault()
Date: Mon, 16 Mar 2020 15:25:40 -0300 [thread overview]
Message-ID: <20200316182540.GA21434@ziepe.ca> (raw)
In-Reply-To: <20200311183506.3997-1-jgg@ziepe.ca>
On Wed, Mar 11, 2020 at 03:34:58PM -0300, Jason Gunthorpe wrote:
> From: Jason Gunthorpe <jgg@mellanox.com>
>
> The hmm_range_fault() flow is fairly complicated. The scheme allows the
> caller to specify if it needs a usable result for each page, or if it only
> needs the current page table status filled in. This mixture of behavior is
> useful for a caller that wants to build a 'prefetch around fault'
> algorithm.
>
> Although we have no in-tree users of this capability, I am working on
> having RDMA ODP work in this manner, and removing these bugs from
> hmm_range_fault() is a necessary step.
>
> The basic principles are:
>
> - If the caller did not ask for a VA to be valid then hmm_range_fault()
> should not fail because of that VA
>
> - If 0 is returned from hmm_range_fault() then the entire pfns array
> contains valid data
>
> - HMM_PFN_ERROR is set if faulting fails, or if asking for faulting
> would fail
>
> - A 0 return from hmm_range_fault() does not have HMM_PFN_ERROR in any
> VA's the caller asked to be valid
>
> This series does not get there completely, I have a followup series
> closing some more complex cases.
>
> I tested this series using Ralph's hmm tester he posted a while back,
> other testing would be appreciated.
>
> Jason Gunthorpe (8):
> mm/hmm: add missing unmaps of the ptep during hmm_vma_handle_pte()
> mm/hmm: do not call hmm_vma_walk_hole() while holding a spinlock
> mm/hmm: add missing pfns set to hmm_vma_walk_pmd()
> mm/hmm: add missing call to hmm_range_need_fault() before returning
> EFAULT
> mm/hmm: reorganize how !pte_present is handled in hmm_vma_handle_pte()
> mm/hmm: return -EFAULT when setting HMM_PFN_ERROR on requested valid
> pages
> mm/hmm: add missing call to hmm_pte_need_fault in HMM_PFN_SPECIAL
> handling
> mm/hmm: do not check pmd_protnone twice in hmm_vma_handle_pmd()
I moved these toward linux-next, if others have remarks or tags please
feel free to continue.
> mm/hmm: don't free the cached pgmap while scanning
I will respin
Thank you all for the reviews!
Regards,
Jason
_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
next prev parent reply other threads:[~2020-03-16 18:25 UTC|newest]
Thread overview: 153+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 18:34 [PATCH hmm 0/8] Various error case bug fixes for hmm_range_fault() Jason Gunthorpe
2020-03-11 18:34 ` Jason Gunthorpe
2020-03-11 18:34 ` Jason Gunthorpe
2020-03-11 18:34 ` [PATCH hmm 1/8] mm/hmm: add missing unmaps of the ptep during hmm_vma_handle_pte() Jason Gunthorpe
2020-03-11 18:34 ` Jason Gunthorpe
2020-03-11 18:34 ` Jason Gunthorpe
2020-03-12 1:28 ` Ralph Campbell
2020-03-12 1:28 ` Ralph Campbell
2020-03-12 1:28 ` Ralph Campbell
2020-03-12 14:24 ` Jason Gunthorpe
2020-03-12 14:24 ` Jason Gunthorpe
2020-03-12 14:24 ` Jason Gunthorpe
2020-03-16 8:58 ` Christoph Hellwig
2020-03-16 8:58 ` Christoph Hellwig
2020-03-11 18:35 ` [PATCH hmm 2/8] mm/hmm: don't free the cached pgmap while scanning Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-12 1:29 ` Ralph Campbell
2020-03-12 1:29 ` Ralph Campbell
2020-03-12 1:29 ` Ralph Campbell
2020-03-16 9:02 ` Christoph Hellwig
2020-03-16 9:02 ` Christoph Hellwig
2020-03-16 18:07 ` Jason Gunthorpe
2020-03-16 18:07 ` Jason Gunthorpe
2020-03-16 18:07 ` Jason Gunthorpe
2020-03-16 18:13 ` Christoph Hellwig
2020-03-16 18:13 ` Christoph Hellwig
2020-03-16 19:23 ` Jason Gunthorpe
2020-03-16 19:23 ` Jason Gunthorpe
2020-03-16 19:23 ` Jason Gunthorpe
2020-03-11 18:35 ` [PATCH hmm 3/8] mm/hmm: do not call hmm_vma_walk_hole() while holding a spinlock Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-12 1:31 ` Ralph Campbell
2020-03-12 1:31 ` Ralph Campbell
2020-03-12 1:31 ` Ralph Campbell
2020-03-12 8:54 ` Steven Price
2020-03-12 8:54 ` Steven Price
2020-03-12 8:54 ` Steven Price
2020-03-12 10:28 ` [PATCH] mm/hmm: Simplify hmm_vma_walk_pud slightly Steven Price
2020-03-12 10:28 ` Steven Price
2020-03-12 10:28 ` Steven Price
2020-03-12 14:27 ` Jason Gunthorpe
2020-03-12 14:27 ` Jason Gunthorpe
2020-03-12 14:27 ` Jason Gunthorpe
2020-03-12 14:40 ` Steven Price
2020-03-12 14:40 ` Steven Price
2020-03-12 14:40 ` Steven Price
2020-03-12 15:11 ` Jason Gunthorpe
2020-03-12 15:11 ` Jason Gunthorpe
2020-03-12 15:11 ` Jason Gunthorpe
2020-03-12 16:16 ` Steven Price
2020-03-12 16:16 ` Steven Price
2020-03-12 16:16 ` Steven Price
2020-03-12 16:37 ` Jason Gunthorpe
2020-03-12 16:37 ` Jason Gunthorpe
2020-03-12 16:37 ` Jason Gunthorpe
2020-03-12 17:02 ` Steven Price
2020-03-12 17:02 ` Steven Price
2020-03-12 17:02 ` Steven Price
2020-03-12 17:17 ` Jason Gunthorpe
2020-03-12 17:17 ` Jason Gunthorpe
2020-03-12 17:17 ` Jason Gunthorpe
2020-03-13 19:55 ` Jason Gunthorpe
2020-03-13 19:55 ` Jason Gunthorpe
2020-03-13 19:55 ` Jason Gunthorpe
2020-03-13 21:04 ` Matthew Wilcox
2020-03-13 21:04 ` Matthew Wilcox
2020-03-13 21:04 ` Matthew Wilcox
2020-03-13 22:51 ` Jason Gunthorpe
2020-03-13 22:51 ` Jason Gunthorpe
2020-03-13 22:51 ` Jason Gunthorpe
2020-03-16 9:05 ` [PATCH hmm 3/8] mm/hmm: do not call hmm_vma_walk_hole() while holding a spinlock Christoph Hellwig
2020-03-16 9:05 ` Christoph Hellwig
2020-03-16 12:56 ` Jason Gunthorpe
2020-03-16 12:56 ` Jason Gunthorpe
2020-03-16 12:56 ` Jason Gunthorpe
2020-03-11 18:35 ` [PATCH hmm 4/8] mm/hmm: add missing pfns set to hmm_vma_walk_pmd() Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-12 1:33 ` Ralph Campbell
2020-03-12 1:33 ` Ralph Campbell
2020-03-12 1:33 ` Ralph Campbell
2020-03-16 9:06 ` Christoph Hellwig
2020-03-16 9:06 ` Christoph Hellwig
2020-03-11 18:35 ` [PATCH hmm 5/8] mm/hmm: add missing call to hmm_range_need_fault() before returning EFAULT Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-12 1:34 ` Ralph Campbell
2020-03-12 1:34 ` Ralph Campbell
2020-03-12 1:34 ` Ralph Campbell
2020-03-16 9:07 ` Christoph Hellwig
2020-03-16 9:07 ` Christoph Hellwig
2020-03-11 18:35 ` [PATCH hmm 6/8] mm/hmm: reorganize how !pte_present is handled in hmm_vma_handle_pte() Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-12 1:36 ` Ralph Campbell
2020-03-12 1:36 ` Ralph Campbell
2020-03-12 1:36 ` Ralph Campbell
2020-03-16 9:11 ` Christoph Hellwig
2020-03-16 9:11 ` Christoph Hellwig
2020-03-11 18:35 ` [PATCH hmm 7/8] mm/hmm: return -EFAULT when setting HMM_PFN_ERROR on requested valid pages Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-12 1:36 ` Ralph Campbell
2020-03-12 1:36 ` Ralph Campbell
2020-03-12 1:36 ` Ralph Campbell
2020-03-12 14:35 ` Jason Gunthorpe
2020-03-12 14:35 ` Jason Gunthorpe
2020-03-12 14:35 ` Jason Gunthorpe
2020-03-16 9:12 ` Christoph Hellwig
2020-03-16 9:12 ` Christoph Hellwig
2020-03-11 18:35 ` [PATCH hmm 8/8] mm/hmm: add missing call to hmm_pte_need_fault in HMM_PFN_SPECIAL handling Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-11 18:35 ` Jason Gunthorpe
2020-03-12 1:38 ` Ralph Campbell
2020-03-12 1:38 ` Ralph Campbell
2020-03-12 1:38 ` Ralph Campbell
2020-03-16 9:13 ` Christoph Hellwig
2020-03-16 9:13 ` Christoph Hellwig
2020-03-16 12:10 ` Jason Gunthorpe
2020-03-16 12:10 ` Jason Gunthorpe
2020-03-16 12:10 ` Jason Gunthorpe
2020-03-16 12:49 ` Christoph Hellwig
2020-03-16 12:49 ` Christoph Hellwig
2020-03-16 13:04 ` Jason Gunthorpe
2020-03-16 13:04 ` Jason Gunthorpe
2020-03-16 13:04 ` Jason Gunthorpe
2020-03-16 13:12 ` Christoph Hellwig
2020-03-16 13:12 ` Christoph Hellwig
2020-03-17 12:32 ` Christoph Hellwig
2020-03-17 12:32 ` Christoph Hellwig
2020-03-17 12:53 ` Jason Gunthorpe
2020-03-17 12:53 ` Jason Gunthorpe
2020-03-17 12:53 ` Jason Gunthorpe
2020-03-17 13:06 ` Christoph Hellwig
2020-03-17 13:06 ` Christoph Hellwig
2020-03-17 13:25 ` Jason Gunthorpe
2020-03-17 13:25 ` Jason Gunthorpe
2020-03-17 13:25 ` Jason Gunthorpe
2020-03-16 12:51 ` Christoph Hellwig
2020-03-16 12:51 ` Christoph Hellwig
2020-03-12 19:33 ` [PATCH hmm 9/8] mm/hmm: do not check pmd_protnone twice in hmm_vma_handle_pmd() Jason Gunthorpe
2020-03-12 19:33 ` Jason Gunthorpe
2020-03-12 19:33 ` Jason Gunthorpe
2020-03-12 23:50 ` Ralph Campbell
2020-03-12 23:50 ` Ralph Campbell
2020-03-12 23:50 ` Ralph Campbell
2020-03-16 9:14 ` Christoph Hellwig
2020-03-16 9:14 ` Christoph Hellwig
2020-03-16 18:25 ` Jason Gunthorpe [this message]
2020-03-16 18:25 ` [PATCH hmm 0/8] Various error case bug fixes for hmm_range_fault() Jason Gunthorpe
2020-03-16 18:25 ` Jason Gunthorpe
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