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mm/balloon_compaction: add vmstat counters and kpageflags bit

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Always mark pages with PageBalloon even if balloon compaction is disabled
and expose this mark in /proc/kpageflags as KPF_BALLOON.

Also this patch adds three counters into /proc/vmstat: "balloon_inflate",
"balloon_deflate" and "balloon_migrate".  They accumulate balloon
activity.  Current size of balloon is (balloon_inflate - balloon_deflate)
pages.

All generic balloon code now gathered under option CONFIG_MEMORY_BALLOON.
It should be selected by ballooning driver which wants use this feature.
Currently virtio-balloon is the only user.

Signed-off-by: Konstantin Khlebnikov <[email protected]>
Cc: Rafael Aquini <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Konstantin Khlebnikov 2014-10-09 15:29:32 -07:00 • committed by Linus Torvalds
commit 09316c09dd
11 changed files with 37 additions and 3 deletions
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7
mm/Kconfig
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@ -230,12 +230,17 @@ config SPLIT_PTLOCK_CPUS
config ARCH_ENABLE_SPLIT_PMD_PTLOCK
boolean
#
# support for memory balloon
config MEMORY_BALLOON
boolean
#
# support for memory balloon compaction
config BALLOON_COMPACTION
bool "Allow for balloon memory compaction/migration"
def_bool y
depends on COMPACTION && VIRTIO_BALLOON
depends on COMPACTION && MEMORY_BALLOON
help
Memory fragmentation introduced by ballooning might reduce
significantly the number of 2MB contiguous memory blocks that can be