[RFC PATCH 0/4] mm: reclaim zbud pages on migration and compaction
From: Krzysztof Kozlowski
Date: Tue Aug 06 2013 - 02:43:02 EST
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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