Linux: individual huge page values in the huge page meter

CRT.c

@@ -151,6 +151,10 @@ static int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
       [MEMORY_BUFFERS] = ColorPair(Blue, Black),
       [MEMORY_BUFFERS_TEXT] = A_BOLD | ColorPair(Blue, Black),
       [MEMORY_CACHE] = ColorPair(Yellow, Black),
+      [HUGEPAGE_1] = ColorPair(Green, Black),
+      [HUGEPAGE_2] = ColorPair(Yellow, Black),
+      [HUGEPAGE_3] = ColorPair(Red, Black),
+      [HUGEPAGE_4] = ColorPair(Blue, Black),
       [LOAD_AVERAGE_FIFTEEN] = ColorPair(Cyan, Black),
       [LOAD_AVERAGE_FIVE] = A_BOLD | ColorPair(Cyan, Black),
       [LOAD_AVERAGE_ONE] = A_BOLD | ColorPair(White, Black),
@@ -237,6 +241,10 @@ static int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
       [MEMORY_BUFFERS] = A_NORMAL,
       [MEMORY_BUFFERS_TEXT] = A_NORMAL,
       [MEMORY_CACHE] = A_NORMAL,
+      [HUGEPAGE_1] = A_BOLD,
+      [HUGEPAGE_2] = A_NORMAL,
+      [HUGEPAGE_3] = A_REVERSE | A_BOLD,
+      [HUGEPAGE_4] = A_REVERSE,
       [LOAD_AVERAGE_FIFTEEN] = A_DIM,
       [LOAD_AVERAGE_FIVE] = A_NORMAL,
       [LOAD_AVERAGE_ONE] = A_BOLD,
@@ -323,6 +331,10 @@ static int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
       [MEMORY_BUFFERS] = ColorPair(Cyan, White),
       [MEMORY_BUFFERS_TEXT] = ColorPair(Cyan, White),
       [MEMORY_CACHE] = ColorPair(Yellow, White),
+      [HUGEPAGE_1] = ColorPair(Green, White),
+      [HUGEPAGE_2] = ColorPair(Yellow, White),
+      [HUGEPAGE_3] = ColorPair(Red, White),
+      [HUGEPAGE_4] = ColorPair(Blue, White),
       [LOAD_AVERAGE_FIFTEEN] = ColorPair(Black, White),
       [LOAD_AVERAGE_FIVE] = ColorPair(Black, White),
       [LOAD_AVERAGE_ONE] = ColorPair(Black, White),
@@ -409,6 +421,10 @@ static int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
       [MEMORY_BUFFERS] = ColorPair(Cyan, Black),
       [MEMORY_BUFFERS_TEXT] = ColorPair(Cyan, Black),
       [MEMORY_CACHE] = ColorPair(Yellow, Black),
+      [HUGEPAGE_1] = ColorPair(Green, Black),
+      [HUGEPAGE_2] = ColorPair(Yellow, Black),
+      [HUGEPAGE_3] = ColorPair(Red, Black),
+      [HUGEPAGE_4] = ColorPair(Blue, Black),
       [LOAD_AVERAGE_FIFTEEN] = ColorPair(Black, Black),
       [LOAD_AVERAGE_FIVE] = ColorPair(Black, Black),
       [LOAD_AVERAGE_ONE] = ColorPair(Black, Black),
@@ -495,6 +511,10 @@ static int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
       [MEMORY_BUFFERS] = A_BOLD | ColorPair(Cyan, Blue),
       [MEMORY_BUFFERS_TEXT] = A_BOLD | ColorPair(Cyan, Blue),
       [MEMORY_CACHE] = A_BOLD | ColorPair(Yellow, Blue),
+      [HUGEPAGE_1] = A_BOLD | ColorPair(Green, Blue),
+      [HUGEPAGE_2] = A_BOLD | ColorPair(Yellow, Blue),
+      [HUGEPAGE_3] = A_BOLD | ColorPair(Red, Blue),
+      [HUGEPAGE_4] = A_BOLD | ColorPair(White, Blue),
       [LOAD_AVERAGE_FIFTEEN] = A_BOLD | ColorPair(Black, Blue),
       [LOAD_AVERAGE_FIVE] = A_NORMAL | ColorPair(White, Blue),
       [LOAD_AVERAGE_ONE] = A_BOLD | ColorPair(White, Blue),
@@ -581,6 +601,10 @@ static int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
       [MEMORY_BUFFERS] = ColorPair(Blue, Black),
       [MEMORY_BUFFERS_TEXT] = A_BOLD | ColorPair(Blue, Black),
       [MEMORY_CACHE] = ColorPair(Yellow, Black),
+      [HUGEPAGE_1] = ColorPair(Green, Black),
+      [HUGEPAGE_2] = ColorPair(Yellow, Black),
+      [HUGEPAGE_3] = ColorPair(Red, Black),
+      [HUGEPAGE_4] = ColorPair(Blue, Black),
       [LOAD_AVERAGE_FIFTEEN] = ColorPair(Green, Black),
       [LOAD_AVERAGE_FIVE] = ColorPair(Green, Black),
       [LOAD_AVERAGE_ONE] = A_BOLD | ColorPair(Green, Black),

CRT.h

@@ -91,6 +91,10 @@ typedef enum ColorElements_ {
    MEMORY_BUFFERS,
    MEMORY_BUFFERS_TEXT,
    MEMORY_CACHE,
+   HUGEPAGE_1,
+   HUGEPAGE_2,
+   HUGEPAGE_3,
+   HUGEPAGE_4,
    LOAD,
    LOAD_AVERAGE_FIFTEEN,
    LOAD_AVERAGE_FIVE,

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:");
+   for (unsigned i = 0; i < ARRAYSIZE(HugePageMeter_active_labels); i++) {
-   Meter_humanUnit(buffer, this->values[0], sizeof(buffer));
+      if (isnan(this->values[i])) {
-   RichString_appendAscii(out, CRT_colors[MEMORY_USED], buffer);
+         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",

linux/LinuxProcessList.c

@@ -1533,7 +1533,9 @@ static inline void LinuxProcessList_scanMemoryInfo(ProcessList* this) {
 
 static void LinuxProcessList_scanHugePages(LinuxProcessList* this) {
    this->totalHugePageMem = 0;
-   this->freeHugePageMem = 0;
+   for (unsigned i = 0; i < HTOP_HUGEPAGE_COUNT; i++) {
+      this->usedHugePageMem[i] = ULLONG_MAX;
+   }
 
    DIR* dir = opendir("/sys/kernel/mm/hugepages");
    if (!dir)
@@ -1575,8 +1577,11 @@ static void LinuxProcessList_scanHugePages(LinuxProcessList* this) {
 
       unsigned long long int free = strtoull(content, NULL, 10);
 
+      int shift = ffsl(hugePageSize) - 1 - (HTOP_HUGEPAGE_BASE_SHIFT - 10);
+      assert(shift >= 0 && shift < HTOP_HUGEPAGE_COUNT);
+
       this->totalHugePageMem += total * hugePageSize;
-      this->freeHugePageMem += free * hugePageSize;
+      this->usedHugePageMem[shift] = (total - free) * hugePageSize;
    }
 
    closedir(dir);

linux/LinuxProcessList.h

@@ -18,6 +18,8 @@ in the source distribution for its full text.
 #include "ZramStats.h"
 #include "zfs/ZfsArcStats.h"
 
+#define HTOP_HUGEPAGE_BASE_SHIFT 16
+#define HTOP_HUGEPAGE_COUNT 24
 
 typedef struct CPUData_ {
    unsigned long long int totalTime;
@@ -73,7 +75,7 @@ typedef struct LinuxProcessList_ {
    #endif
 
    unsigned long long int totalHugePageMem;
-   unsigned long long int freeHugePageMem;
+   unsigned long long int usedHugePageMem[HTOP_HUGEPAGE_COUNT];
 
    ZfsArcStats zfs;
    ZramStats zram;