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→Post-copy for shared memory and hugetlbfs
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−TODO: Detailed description of the project.+
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=== Post-copy for shared memory and hugetlbfs ===
=== Post-copy for shared memory and hugetlbfs ===
'''Summary:''' TODO: Short description of the project
+'''Summary:''' extend post-copy memory restore and migration to support shared memory and hugeltbfs.
−CRIU relies on [[Userfaultfd]] mechanism in the Linux kernel to implement the demand paging in userspace and allow post-copy memory (or lazy) [[Lazy_migration|migration]]. However, currently this support is limited to anonymous private memory mappings, although kernel also supports shared memory areas and hugetlbfs backed memory.
+The shared memory support for lazy migration can be added to CRIU without kernel modifications, while proper handling of hugetlbfs would require userfaultfd callbacks for [http://man7.org/linux/man-pages/man2/fallocate.2.html fallocate(PUNCH_HOLE)] and [http://man7.org/linux/man-pages/man2/madvise.2.html madvise(MADV_REMOVE)] system calls.
'''Links:'''
'''Links:'''
−* Wiki links to relevant material
+* [https://www.kernel.org/doc/html/latest/admin-guide/mm/userfaultfd.html Userfaultfd]
−* External links to mailing lists or web sites
+* [https://www.kernel.org/doc/html/latest/admin-guide/mm/hugetlbpage.html hugetlbfs]
−'''Details:'''
'''Details:'''
−* Skill level: beginner or intermediate or advanced
+* Skill level: most probably advanced?
* Language: C
* Language: C
* Mentor: Mike Rapoport <rppt@linux.ibm.com>
* Mentor: Mike Rapoport <rppt@linux.ibm.com>
* Suggested by: Mike Rapoport <rppt@linux.ibm.com>
* Suggested by: Mike Rapoport <rppt@linux.ibm.com>
−=== Optimize logging engine ===
=== Optimize logging engine ===