Messages in this thread | | | From | David Hildenbrand <> | Subject | [PATCH v4 0/6] mm / virtio-mem: support ZONE_MOVABLE | Date | Tue, 4 Aug 2020 21:41:36 +0200 |
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@Andrew can we give this a churn and consider it for v5.9 in case there are no more comments?
Patch #1-#4,#6 have RBss or ACKs, patch #5 is virtio-mem stuff maintained by me (and MST is aware).
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When introducing virtio-mem, the semantics of ZONE_MOVABLE were rather unclear, which is why we special-cased ZONE_MOVABLE such that partially plugged blocks would never end up in ZONE_MOVABLE.
Now that the semantics are much clearer (and are documented in patch #6), let's support partially plugged memory blocks in ZONE_MOVABLE, allowing partially plugged memory blocks to be online to ZONE_MOVABLE and also unplugging from such memory blocks. This avoids surprises when onlining of memory blocks suddenly fails, just because they are not completely populated by virtio-mem (yet).
This is especially helpful for testing, but also paves the way for virtio-mem optimizations, allowing more memory to get reliably unplugged.
Cleanup has_unmovable_pages() and set_migratetype_isolate(), providing better documentation of how ZONE_MOVABLE interacts with different kind of unmovable pages (memory offlining vs. alloc_contig_range()).
v3 -> v4: - "mm/page_isolation: drop WARN_ON_ONCE() in set_migratetype_isolate()" -- Fix typo in description - "virtio-mem: don't special-case ZONE_MOVABLE" -- Add more details why we initialli special-cased ZONE_MOVABLE (via MST) - "mm: document semantics of ZONE_MOVABLE" -- Rephrase some parts of documentation (via Mike)
v2 -> v3: - "mm: document semantics of ZONE_MOVABLE" -- Fix a typo
v1 -> v2: - "mm/page_isolation: don't dump_page(NULL) in set_migratetype_isolate()" -- Move to position 1, add Fixes: tag -- Drop unused "out:" label - "mm/page_isolation: drop WARN_ON_ONCE() in set_migratetype_isolate()" -- Keep curly braces on "else" case - Replace "[PATCH v1 5/6] mm/page_alloc: restrict ZONE_MOVABLE optimization in has_unmovable_pages() to memory offlining" by "mm: document semantics of ZONE_MOVABLE" -- Brain dump of what I know about ZONE_MOVABLE
David Hildenbrand (6): mm/page_isolation: don't dump_page(NULL) in set_migratetype_isolate() mm/page_alloc: tweak comments in has_unmovable_pages() mm/page_isolation: drop WARN_ON_ONCE() in set_migratetype_isolate() mm/page_isolation: cleanup set_migratetype_isolate() virtio-mem: don't special-case ZONE_MOVABLE mm: document semantics of ZONE_MOVABLE
drivers/virtio/virtio_mem.c | 47 +++++++------------------------------ include/linux/mmzone.h | 35 +++++++++++++++++++++++++++ mm/page_alloc.c | 22 +++++------------ mm/page_isolation.c | 39 ++++++++++++++---------------- 4 files changed, 66 insertions(+), 77 deletions(-)
-- 2.26.2
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