mm/balloon_compaction: add vmstat counters and kpageflags bit
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>
diff --git a/mm/Kconfig b/mm/Kconfig
index 0ceb8a5..1d1ae6b 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -231,11 +231,16 @@
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
diff --git a/mm/Makefile b/mm/Makefile
index f8ed7ab..1f534a7 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -16,7 +16,7 @@
readahead.o swap.o truncate.o vmscan.o shmem.o \
util.o mmzone.o vmstat.o backing-dev.o \
mm_init.o mmu_context.o percpu.o slab_common.o \
- compaction.o balloon_compaction.o vmacache.o \
+ compaction.o vmacache.o \
interval_tree.o list_lru.o workingset.o \
iov_iter.o debug.o $(mmu-y)
@@ -67,3 +67,4 @@
obj-$(CONFIG_ZSMALLOC) += zsmalloc.o
obj-$(CONFIG_GENERIC_EARLY_IOREMAP) += early_ioremap.o
obj-$(CONFIG_CMA) += cma.o
+obj-$(CONFIG_MEMORY_BALLOON) += balloon_compaction.o
diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c
index 3afdabd..b3cbe19 100644
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c
@@ -36,6 +36,7 @@
BUG_ON(!trylock_page(page));
spin_lock_irqsave(&b_dev_info->pages_lock, flags);
balloon_page_insert(b_dev_info, page);
+ __count_vm_event(BALLOON_INFLATE);
spin_unlock_irqrestore(&b_dev_info->pages_lock, flags);
unlock_page(page);
return page;
@@ -74,6 +75,7 @@
}
spin_lock_irqsave(&b_dev_info->pages_lock, flags);
balloon_page_delete(page);
+ __count_vm_event(BALLOON_DEFLATE);
spin_unlock_irqrestore(&b_dev_info->pages_lock, flags);
unlock_page(page);
dequeued_page = true;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index e9ab104..cce7c76 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -735,7 +735,7 @@
TEXT_FOR_HIGHMEM(xx) xx "_movable",
const char * const vmstat_text[] = {
- /* Zoned VM counters */
+ /* enum zone_stat_item countes */
"nr_free_pages",
"nr_alloc_batch",
"nr_inactive_anon",
@@ -778,10 +778,13 @@
"workingset_nodereclaim",
"nr_anon_transparent_hugepages",
"nr_free_cma",
+
+ /* enum writeback_stat_item counters */
"nr_dirty_threshold",
"nr_dirty_background_threshold",
#ifdef CONFIG_VM_EVENT_COUNTERS
+ /* enum vm_event_item counters */
"pgpgin",
"pgpgout",
"pswpin",
@@ -860,6 +863,13 @@
"thp_zero_page_alloc",
"thp_zero_page_alloc_failed",
#endif
+#ifdef CONFIG_MEMORY_BALLOON
+ "balloon_inflate",
+ "balloon_deflate",
+#ifdef CONFIG_BALLOON_COMPACTION
+ "balloon_migrate",
+#endif
+#endif /* CONFIG_MEMORY_BALLOON */
#ifdef CONFIG_DEBUG_TLBFLUSH
#ifdef CONFIG_SMP
"nr_tlb_remote_flush",