* 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; +Cc: mounesh.b [-- Attachment #1: Type: text/plain, Size: 429 bytes --] 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 [-- Attachment #2: Type: text/html, Size: 1409 bytes --] ^ permalink raw reply [flat|nested] 2+ messages in thread
* 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; +Cc: mounesh.b 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 ^ permalink raw reply [flat|nested] 2+ messages in thread
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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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