{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, 3 insertions, 1 deletions

diff --git a/dragonflybsd/Platform.c b/dragonflybsd/Platform.c
index ab21d365..99527642 100644
--- a/dragonflybsd/Platform.c
+++ b/dragonflybsd/Platform.c
@@ -215,6 +215,7 @@ void Platform_setMemoryValues(Meter* this) {
    this->values[MEMORY_METER_USED] = pl->usedMem;
    this->values[MEMORY_METER_BUFFERS] = pl->buffersMem;
    // this->values[MEMORY_METER_SHARED] = "shared memory, like tmpfs and shm"
+   // mtr->values[MEMORY_METER_COMPRESSED] = "compressed memory, like zswap on linux"
    this->values[MEMORY_METER_CACHE] = pl->cachedMem;
    // this->values[MEMORY_METER_AVAILABLE] = "available memory"
 }
@@ -223,7 +224,8 @@ void Platform_setSwapValues(Meter* this) {
    const ProcessList* pl = this->pl;
    this->total = pl->totalSwap;
    this->values[SWAP_METER_USED] = pl->usedSwap;
-   this->values[SWAP_METER_CACHE] = NAN;
+   // mtr->values[SWAP_METER_CACHE] = "pages that are both in swap and RAM, like SwapCached on linux"
+   // mtr->values[SWAP_METER_FRONTSWAP] = "pages that are accounted to swap but stored elsewhere, like frontswap on linux"
 }
 
 char* Platform_getProcessEnv(pid_t pid) {