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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 <k.khlebnikov@samsung.com>
Cc: Rafael Aquini <aquini@redhat.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Konstantin Khlebnikov
2014-10-09 15:29:32 -07:00
committed by Linus Torvalds
parent 9d1ba80564
commit 09316c09dd
11 changed files with 37 additions and 3 deletions
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mm/Kconfig
+6 -1
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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