Allocating mutiple pages and create continuous address space

Asked Jan 20 '17 at 00:58

Active Jan 20 '17 at 00:58

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I want to create a big buffer in kernel with continuous address space using struct page.

The idea is to use alloc_page to create nr_pages * pages (I must strongly NOT use alloc_pages(...,order) which returns one struct page *page) and then somehow combine these nr_pages * PAGE_SIZE space.

If I alloc_page I can then addr = page_address(page) so that I can memcpy to/from this 4k space. But what about more space?

Any ideas will be helpful

asked Jan 20 '17 at 00:58

Mike R

How much is your big buffer ? – Yacine Hebbal Jan 20 '17 at 11:06
Something bigger than one page (thus PAGE SIZE). Like 64k, or 16 pages – Mike R Jan 20 '17 at 11:40
You can just use kmalloc, on a 64 bit kernel you can allocate up to 4 MB buffer – Yacine Hebbal Jan 20 '17 at 11:57
I strongly need to use mutiple pages, because this is a part of an API. Or maybe I can `addr =kmalloc` but I must somehow get the `struct page *pages` of this memory. – Mike R Jan 20 '17 at 15:56
You have the order parameter which enables you to specify the size of the continuous pages, 9 means 2mb space of continuous pages – Yacine Hebbal Jan 20 '17 at 17:34

Allocating mutiple pages and create continuous address space

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