Linux: handle hugepages

Subtract hugepages from normal memory.
Add a HugePageMeter.

Closes: #447

1 files changed, 63 insertions, 0 deletions

diff --git a/linux/HugePageMeter.c b/linux/HugePageMeter.c
new file mode 100644
index 00000000..e546c79a
--- /dev/null
+++ b/linux/HugePageMeter.c
@@ -0,0 +1,63 @@
+/*
+htop - HugePageMeter.c
+(C) 2021 htop dev team
+Released under the GNU GPLv2, see the COPYING file
+in the source distribution for its full text.
+*/
+
+#include "HugePageMeter.h"
+
+#include "LinuxProcessList.h"
+
+#include "CRT.h"
+#include "Object.h"
+#include "RichString.h"
+
+
+static const int HugePageMeter_attributes[] = {
+   MEMORY_USED,
+};
+
+static void HugePageMeter_updateValues(Meter* this, char* buffer, size_t size) {
+   int written;
+
+   const LinuxProcessList* lpl = (const LinuxProcessList*) this->pl;
+   this->total = lpl->totalHugePageMem;
+   this->values[0] = lpl->totalHugePageMem - lpl->freeHugePageMem;
+
+   written = Meter_humanUnit(buffer, this->values[0], size);
+   METER_BUFFER_CHECK(buffer, size, written);
+
+   METER_BUFFER_APPEND_CHR(buffer, size, '/');
+
+   Meter_humanUnit(buffer, this->total, size);
+}
+
+static void HugePageMeter_display(const Object* cast, RichString* out) {
+   char buffer[50];
+   const Meter* this = (const Meter*)cast;
+
+   RichString_writeAscii(out, CRT_colors[METER_TEXT], ":");
+   Meter_humanUnit(buffer, this->total, sizeof(buffer));
+   RichString_appendAscii(out, CRT_colors[METER_VALUE], buffer);
+
+   RichString_appendAscii(out, CRT_colors[METER_TEXT], " used:");
+   Meter_humanUnit(buffer, this->values[0], sizeof(buffer));
+   RichString_appendAscii(out, CRT_colors[MEMORY_USED], buffer);
+}
+
+const MeterClass HugePageMeter_class = {
+   .super = {
+      .extends = Class(Meter),
+      .delete = Meter_delete,
+      .display = HugePageMeter_display,
+   },
+   .updateValues = HugePageMeter_updateValues,
+   .defaultMode = BAR_METERMODE,
+   .maxItems = 1,
+   .total = 100.0,
+   .attributes = HugePageMeter_attributes,
+   .name = "HugePages",
+   .uiName = "HugePages",
+   .caption = "HP"
+};