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Subject[RFC PATCH 0/4] mm: reclaim zbud pages on migration and compaction
Date
Hi,

Currently zbud pages are not movable and they cannot be allocated from CMA
region. These patches try to address the problem by:
1. Adding a new form of reclaim of zbud pages.
2. Reclaiming zbud pages during migration and compaction.
3. Allocating zbud pages with __GFP_RECLAIMABLE flag.

This reclaim process is different than zbud_reclaim_page(). It acts more
like swapoff() by trying to unuse pages stored in zbud page and bring
them back to memory. The standard zbud_reclaim_page() on the other hand
tries to write them back.

One of patches introduces a new flag: PageZbud. This flag is used in
isolate_migratepages_range() to grab zbud pages and pass them later
for reclaim. Probably this could be replaced with something
smarter than a flag used only in one case.
Any ideas for a better solution are welcome.

This patch set is based on Linux 3.11-rc4.

TODOs:
1. Replace PageZbud flag with other solution.

Best regards,
Krzysztof Kozlowski


Krzysztof Kozlowski (4):
zbud: use page ref counter for zbud pages
mm: split code for unusing swap entries from try_to_unuse
mm: add zbud flag to page flags
mm: reclaim zbud pages on migration and compaction

include/linux/page-flags.h | 12 ++
include/linux/swapfile.h | 2 +
include/linux/zbud.h | 11 +-
mm/compaction.c | 20 ++-
mm/internal.h | 1 +
mm/page_alloc.c | 9 ++
mm/swapfile.c | 354 +++++++++++++++++++++++---------------------
mm/zbud.c | 301 +++++++++++++++++++++++++------------
mm/zswap.c | 57 ++++++-
9 files changed, 499 insertions(+), 268 deletions(-)

--
1.7.9.5



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