[PATCH v2 01/34] mm/gup: add make_dirty arg to put_user_pages_dirty_lock()
jhubbard at nvidia.com
Tue Aug 6 20:39:16 UTC 2019
On 8/6/19 10:39 AM, Ira Weiny wrote:
> On Sun, Aug 04, 2019 at 03:48:42PM -0700, john.hubbard at gmail.com wrote:
>> From: John Hubbard <jhubbard at nvidia.com>
>> - * put_user_pages_dirty() - release and dirty an array of gup-pinned pages
>> - * @pages: array of pages to be marked dirty and released.
>> + * put_user_pages_dirty_lock() - release and optionally dirty gup-pinned pages
>> + * @pages: array of pages to be maybe marked dirty, and definitely released.
> Better would be.
> @pages: array of pages to be put
OK, I'll change to that wording.
>> * @npages: number of pages in the @pages array.
>> + * @make_dirty: whether to mark the pages dirty
>> * "gup-pinned page" refers to a page that has had one of the get_user_pages()
>> * variants called on that page.
>> * For each page in the @pages array, make that page (or its head page, if a
>> - * compound page) dirty, if it was previously listed as clean. Then, release
>> - * the page using put_user_page().
>> + * compound page) dirty, if @make_dirty is true, and if the page was previously
>> + * listed as clean. In any case, releases all pages using put_user_page(),
>> + * possibly via put_user_pages(), for the non-dirty case.
> I don't think users of this interface need this level of detail. I think
> something like.
> * For each page in the @pages array, release the page. If @make_dirty is
> * true, mark the page dirty prior to release.
Yes, it is too wordy, I'll change to that.
>> -void put_user_pages_dirty_lock(struct page **pages, unsigned long npages)
>> - __put_user_pages_dirty(pages, npages, set_page_dirty_lock);
>> + /*
>> + * TODO: this can be optimized for huge pages: if a series of pages is
>> + * physically contiguous and part of the same compound page, then a
>> + * single operation to the head page should suffice.
>> + */
> I think this comment belongs to the for loop below... or just something about
> how to make this and put_user_pages() more efficient. It is odd, that this is
> the same comment as in put_user_pages()...
Actually I think I'll just delete the comment entirely, it's just noise really.
> The code is good. So... Other than the comments.
> Reviewed-by: Ira Weiny <ira.weiny at intel.com>
Thanks for the review!
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