From: Peter Xu <peterx@redhat.com>
To: Alistair Popple <apopple@nvidia.com>
Cc: linux-mm@kvack.org, nouveau@lists.freedesktop.org,
bskeggs@redhat.com, akpm@linux-foundation.org,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org, jhubbard@nvidia.com,
rcampbell@nvidia.com, jglisse@redhat.com, jgg@nvidia.com,
hch@infradead.org, daniel@ffwll.ch, willy@infradead.org,
bsingharora@gmail.com, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v8 1/8] mm: Remove special swap entry functions
Date: Mon, 17 May 2021 22:17:32 -0400 [thread overview]
Message-ID: <YKMjvKGIHdwQN2Ml@t490s> (raw)
In-Reply-To: <20210407084238.20443-2-apopple@nvidia.com>
On Wed, Apr 07, 2021 at 06:42:31PM +1000, Alistair Popple wrote:
> +static inline struct page *pfn_swap_entry_to_page(swp_entry_t entry)
> +{
> + struct page *p = pfn_to_page(swp_offset(entry));
> +
> + /*
> + * Any use of migration entries may only occur while the
> + * corresponding page is locked
> + */
> + BUG_ON(is_migration_entry(entry) && !PageLocked(p));
> +
> + return p;
> +}
Would swap_pfn_entry_to_page() be slightly better?
The thing is it's very easy to read pfn_*() as a function to take a pfn as
parameter...
Since I'm also recently working on some swap-related new ptes [1], I'm thinking
whether we could name these swap entries as "swap XXX entries". Say, "swap
hwpoison entry", "swap pfn entry" (which is a superset of "swap migration
entry", "swap device exclusive entry", ...). That's where I came with the
above swap_pfn_entry_to_page(), then below will be naturally is_swap_pfn_entry().
No strong opinion as this is already a v8 series (and sorry to chim in this
late), just to raise this up.
[1] https://lore.kernel.org/lkml/20210427161317.50682-1-peterx@redhat.com/
Thanks,
> +
> +/*
> + * A pfn swap entry is a special type of swap entry that always has a pfn stored
> + * in the swap offset. They are used to represent unaddressable device memory
> + * and to restrict access to a page undergoing migration.
> + */
> +static inline bool is_pfn_swap_entry(swp_entry_t entry)
> +{
> + return is_migration_entry(entry) || is_device_private_entry(entry);
> +}
--
Peter Xu
next prev parent reply other threads:[~2021-05-18 2:17 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 8:42 [PATCH v8 0/8] Add support for SVM atomics in Nouveau Alistair Popple
2021-04-07 8:42 ` [PATCH v8 1/8] mm: Remove special swap entry functions Alistair Popple
2021-05-18 2:17 ` Peter Xu [this message]
2021-05-18 11:58 ` Alistair Popple
2021-05-18 14:17 ` Peter Xu
2021-04-07 8:42 ` [PATCH v8 2/8] mm/swapops: Rework swap entry manipulation code Alistair Popple
2021-04-07 8:42 ` [PATCH v8 3/8] mm/rmap: Split try_to_munlock from try_to_unmap Alistair Popple
2021-05-18 20:04 ` Liam Howlett
2021-05-19 12:38 ` Alistair Popple
2021-05-20 20:24 ` Liam Howlett
2021-05-21 2:23 ` Alistair Popple
2021-04-07 8:42 ` [PATCH v8 4/8] mm/rmap: Split migration into its own function Alistair Popple
2021-04-07 8:42 ` [PATCH v8 5/8] mm: Device exclusive memory access Alistair Popple
2021-05-18 2:08 ` Peter Xu
2021-05-18 13:19 ` Alistair Popple
2021-05-18 17:27 ` Peter Xu
2021-05-18 17:33 ` Jason Gunthorpe
2021-05-18 18:01 ` Peter Xu
2021-05-18 19:45 ` Jason Gunthorpe
2021-05-18 20:29 ` Peter Xu
2021-05-18 23:03 ` Jason Gunthorpe
2021-05-18 23:45 ` Peter Xu
2021-05-19 11:04 ` Alistair Popple
2021-05-19 12:15 ` Peter Xu
2021-05-19 13:11 ` Alistair Popple
2021-05-19 14:04 ` Peter Xu
2021-05-19 13:28 ` Jason Gunthorpe
2021-05-19 14:09 ` Peter Xu
2021-05-19 18:11 ` Jason Gunthorpe
2021-05-19 11:35 ` Alistair Popple
2021-05-19 12:21 ` Peter Xu
2021-05-19 12:46 ` Alistair Popple
2021-05-21 6:53 ` Alistair Popple
2021-05-18 21:16 ` Peter Xu
2021-05-19 10:49 ` Alistair Popple
2021-05-19 12:24 ` Peter Xu
2021-05-19 12:46 ` Alistair Popple
2021-04-07 8:42 ` [PATCH v8 6/8] mm: Selftests for exclusive device memory Alistair Popple
2021-04-07 8:42 ` [PATCH v8 7/8] nouveau/svm: Refactor nouveau_range_fault Alistair Popple
2021-04-07 8:42 ` [PATCH v8 8/8] nouveau/svm: Implement atomic SVM access Alistair Popple
2021-05-21 4:04 ` Ben Skeggs
2021-05-06 7:43 ` [PATCH v8 0/8] Add support for SVM atomics in Nouveau Alistair Popple
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