* Question regarding pinning of memory
[not found] <1076302825.4233137.1715068078694.ref@mail.yahoo.com>
@ 2024-05-07 7:47 ` sunil bhargo
2024-05-07 8:09 ` David Hildenbrand
0 siblings, 1 reply; 2+ messages in thread
From: sunil bhargo @ 2024-05-07 7:47 UTC (permalink / raw
To: linux-mm@kvack.org; +Cc: mounesh.b@gmail.com
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Hi, We have written an application that would open a device and then mmap it. In the kernel module the memory is allocated using vmalloc (don't require contiguous physical memory) and in mmap we are calling remap_pfn_range to map the memory to user space. The question is would this mechanism be enough that the memory would be pinned (neither swappable nor the page migration would happen) ?
Thanks,Sunil Bhargo
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* Re: Question regarding pinning of memory
2024-05-07 7:47 ` Question regarding pinning of memory sunil bhargo
@ 2024-05-07 8:09 ` David Hildenbrand
0 siblings, 0 replies; 2+ messages in thread
From: David Hildenbrand @ 2024-05-07 8:09 UTC (permalink / raw
To: sunil bhargo, linux-mm@kvack.org; +Cc: mounesh.b@gmail.com
On 07.05.24 09:47, sunil bhargo wrote:
> Hi,
> We have written an application that would open a device and then
> mmap it.
> In the kernel module the memory is allocated using vmalloc (don't
> require contiguous physical memory) and in mmap we are calling
> remap_pfn_range to map the memory to user space.
> The question is would this mechanism be enough that the memory would
> be pinned (neither swappable nor the page migration would happen) ?
Recent related question:
https://lore.kernel.org/linux-mm/ea59a8b7-6167-4ab1-92f2-f2a171310a50@redhat.com/T/
--
Cheers,
David / dhildenb
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2024-05-07 7:47 ` Question regarding pinning of memory sunil bhargo
2024-05-07 8:09 ` David Hildenbrand
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