From 03824da684731557ecf2e809ade6310277744a7e Mon Sep 17 00:00:00 2001
From: David Zarzycki <dave@znu.io>
Date: Thu, 14 Jan 2021 09:46:37 -0500
Subject: Linux: individual huge page values in the huge page meter

---
 linux/HugePageMeter.c | 52 ++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 45 insertions(+), 7 deletions(-)

(limited to 'linux/HugePageMeter.c')

diff --git a/linux/HugePageMeter.c b/linux/HugePageMeter.c
index e546c79a..7222c87a 100644
--- a/linux/HugePageMeter.c
+++ b/linux/HugePageMeter.c
@@ -9,23 +9,56 @@ in the source distribution for its full text.
 
 #include "LinuxProcessList.h"
 
+#include <limits.h>
+#include <math.h>
+
 #include "CRT.h"
 #include "Object.h"
 #include "RichString.h"
 
+static const char *HugePageMeter_active_labels[4] = { NULL, NULL, NULL, NULL };
 
 static const int HugePageMeter_attributes[] = {
-   MEMORY_USED,
+   HUGEPAGE_1,
+   HUGEPAGE_2,
+   HUGEPAGE_3,
+   HUGEPAGE_4,
+};
+
+static const char* const HugePageMeter_labels[] = {
+   " 64K:", " 128K:", " 256K:", " 512K:",
+   " 1M:", " 2M:", " 4M:", " 8M:", " 16M:", " 32M:", " 64M:", " 128M:", " 256M:", " 512M:",
+   " 1G:", " 2G:", " 4G:", " 8G:", " 16G:", " 32G:", " 64G:", " 128G:", " 256G:", " 512G:",
 };
 
 static void HugePageMeter_updateValues(Meter* this, char* buffer, size_t size) {
+   assert(ARRAYSIZE(HugePageMeter_labels) == HTOP_HUGEPAGE_COUNT);
+
    int written;
+   unsigned long long int usedTotal = 0;
+   unsigned nextUsed = 0;
 
    const LinuxProcessList* lpl = (const LinuxProcessList*) this->pl;
    this->total = lpl->totalHugePageMem;
-   this->values[0] = lpl->totalHugePageMem - lpl->freeHugePageMem;
+   this->values[0] = 0;
+   HugePageMeter_active_labels[0] = " used:";
+   for (unsigned i = 1; i < ARRAYSIZE(HugePageMeter_active_labels); i++) {
+      this->values[i] = NAN;
+      HugePageMeter_active_labels[i] = NULL;
+   }
+   for (unsigned i = 0; i < HTOP_HUGEPAGE_COUNT; i++) {
+      unsigned long long int value = lpl->usedHugePageMem[i];
+      if (value != ULLONG_MAX) {
+         this->values[nextUsed] = value;
+         usedTotal += value;
+         HugePageMeter_active_labels[nextUsed] = HugePageMeter_labels[i];
+         if (++nextUsed == ARRAYSIZE(HugePageMeter_active_labels)) {
+            break;
+         }
+      }
+   }
 
-   written = Meter_humanUnit(buffer, this->values[0], size);
+   written = Meter_humanUnit(buffer, usedTotal, size);
    METER_BUFFER_CHECK(buffer, size, written);
 
    METER_BUFFER_APPEND_CHR(buffer, size, '/');
@@ -41,9 +74,14 @@ static void HugePageMeter_display(const Object* cast, RichString* out) {
    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);
+   for (unsigned i = 0; i < ARRAYSIZE(HugePageMeter_active_labels); i++) {
+      if (isnan(this->values[i])) {
+         break;
+      }
+      RichString_appendAscii(out, CRT_colors[METER_TEXT], HugePageMeter_active_labels[i]);
+      Meter_humanUnit(buffer, this->values[i], sizeof(buffer));
+      RichString_appendAscii(out, CRT_colors[HUGEPAGE_1 + i], buffer);
+   }
 }
 
 const MeterClass HugePageMeter_class = {
@@ -54,7 +92,7 @@ const MeterClass HugePageMeter_class = {
    },
    .updateValues = HugePageMeter_updateValues,
    .defaultMode = BAR_METERMODE,
-   .maxItems = 1,
+   .maxItems = ARRAYSIZE(HugePageMeter_active_labels),
    .total = 100.0,
    .attributes = HugePageMeter_attributes,
    .name = "HugePages",
-- 
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