{Memory,Swap}Meter: add "compressed memory" metrics

For now, the semantics are mostly fit for Linux zswap subsystem. For
instance, we add the third swap usage metric that indicates the amount
of memory that is accounted to swap but in fact stored elsewhere. This
exactly matches the definition of frontswap/zswap, and is probably of
little use to all other platforms.

1 files changed, 4 insertions, 3 deletions

diff --git a/MemoryMeter.h b/MemoryMeter.h
index d8f5fdbc..b6568afc 100644
--- a/MemoryMeter.h
+++ b/MemoryMeter.h
@@ -13,9 +13,10 @@ typedef enum {
    MEMORY_METER_USED = 0,
    MEMORY_METER_BUFFERS = 1,
    MEMORY_METER_SHARED = 2,
-   MEMORY_METER_CACHE = 3,
-   MEMORY_METER_AVAILABLE = 4,
-   MEMORY_METER_ITEMCOUNT = 5, // number of entries in this enum
+   MEMORY_METER_COMPRESSED = 3,
+   MEMORY_METER_CACHE = 4,
+   MEMORY_METER_AVAILABLE = 5,
+   MEMORY_METER_ITEMCOUNT = 6, // number of entries in this enum
 } MemoryMeterValues;
 
 extern const MeterClass MemoryMeter_class;