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Subject[PATCH 0/6] thp/khugepaged improvements and CoW semantics
Date
The patchset adds khugepaged selftest (anon-THP only for now), expands
cases khugepaged can handle and switches anon-THP copy-on-write handling
to 4k.

Please review and consider applying.

v3:
- Fix handling compound pages in swap cache;
- Rework swaped vs. referenced check;
- Fix refcounting for compound pages;
- Drop Reviewed-by/Acked-by as patchset changed non-trivially;
- Typos;
v2:
- Fix race in compound page handling;
- Add one more test-case for compound page case;
- Rework LRU add cache draining;
- Typos;

Kirill A. Shutemov (6):
khugepaged: Add self test
khugepaged: Do not stop collapse if less than half PTEs are referenced
khugepaged: Drain all LRU caches before scanning pages
khugepaged: Drain LRU add pagevec after swapin
khugepaged: Allow to collapse a page shared across fork
khugepaged: Allow to collapse PTE-mapped compound pages

mm/khugepaged.c | 172 +++--
tools/testing/selftests/vm/Makefile | 1 +
tools/testing/selftests/vm/khugepaged.c | 899 ++++++++++++++++++++++++
3 files changed, 1012 insertions(+), 60 deletions(-)
create mode 100644 tools/testing/selftests/vm/khugepaged.c

--
2.26.0

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