Linux: individually show shared memory

Shmem: Total memory used by shared memory (shmem) and tmpfs

Source: https://www.kernel.org/doc/Documentation/filesystems/proc.txt

Closes: #556

CRT.c

@@ -155,6 +155,7 @@ 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),
+      [MEMORY_SHARED] = ColorPair(Magenta, Black),
       [HUGEPAGE_1] = ColorPair(Green, Black),
       [HUGEPAGE_2] = ColorPair(Yellow, Black),
       [HUGEPAGE_3] = ColorPair(Red, Black),
@@ -245,6 +246,7 @@ static int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
       [MEMORY_BUFFERS] = A_NORMAL,
       [MEMORY_BUFFERS_TEXT] = A_NORMAL,
       [MEMORY_CACHE] = A_NORMAL,
+      [MEMORY_SHARED] = A_NORMAL,
       [HUGEPAGE_1] = A_BOLD,
       [HUGEPAGE_2] = A_NORMAL,
       [HUGEPAGE_3] = A_REVERSE | A_BOLD,
@@ -335,6 +337,7 @@ static int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
       [MEMORY_BUFFERS] = ColorPair(Cyan, White),
       [MEMORY_BUFFERS_TEXT] = ColorPair(Cyan, White),
       [MEMORY_CACHE] = ColorPair(Yellow, White),
+      [MEMORY_SHARED] = ColorPair(Magenta, White),
       [HUGEPAGE_1] = ColorPair(Green, White),
       [HUGEPAGE_2] = ColorPair(Yellow, White),
       [HUGEPAGE_3] = ColorPair(Red, White),
@@ -425,6 +428,7 @@ static int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT] = {
       [MEMORY_BUFFERS] = ColorPair(Cyan, Black),
       [MEMORY_BUFFERS_TEXT] = ColorPair(Cyan, Black),
       [MEMORY_CACHE] = ColorPair(Yellow, Black),
+      [MEMORY_SHARED] = ColorPair(Magenta, Black),
       [HUGEPAGE_1] = ColorPair(Green, Black),
       [HUGEPAGE_2] = ColorPair(Yellow, Black),
       [HUGEPAGE_3] = ColorPair(Red, Black),
@@ -515,6 +519,7 @@ 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),
+      [MEMORY_SHARED] = A_BOLD | ColorPair(Magenta, Blue),
       [HUGEPAGE_1] = A_BOLD | ColorPair(Green, Blue),
       [HUGEPAGE_2] = A_BOLD | ColorPair(Yellow, Blue),
       [HUGEPAGE_3] = A_BOLD | ColorPair(Red, Blue),
@@ -605,6 +610,7 @@ 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),
+      [MEMORY_SHARED] = ColorPair(Magenta, Black),
       [HUGEPAGE_1] = ColorPair(Green, Black),
       [HUGEPAGE_2] = ColorPair(Yellow, Black),
       [HUGEPAGE_3] = ColorPair(Red, Black),

CRT.h

@@ -92,6 +92,7 @@ typedef enum ColorElements_ {
    MEMORY_BUFFERS,
    MEMORY_BUFFERS_TEXT,
    MEMORY_CACHE,
+   MEMORY_SHARED,
    HUGEPAGE_1,
    HUGEPAGE_2,
    HUGEPAGE_3,

MemoryMeter.c

@@ -18,7 +18,8 @@ in the source distribution for its full text.
 static const int MemoryMeter_attributes[] = {
    MEMORY_USED,
    MEMORY_BUFFERS,
-   MEMORY_CACHE
+   MEMORY_CACHE,
+   MEMORY_SHARED
 };
 
 static void MemoryMeter_updateValues(Meter* this) {
@@ -26,14 +27,15 @@ static void MemoryMeter_updateValues(Meter* this) {
    size_t size = sizeof(this->txtBuffer);
    int written;
 
-   /* available memory is not supported on all platforms */
+   /* shared and available memory are not supported on all platforms */
    this->values[3] = NAN;
+   this->values[4] = NAN;
    Platform_setMemoryValues(this);
 
    /* Do not print available memory in bar mode */
-   this->curItems = 3;
+   this->curItems = 4;
 
-   written = Meter_humanUnit(buffer, isnan(this->values[3]) ? this->values[0] : this->total - this->values[3], size);
+   written = Meter_humanUnit(buffer, isnan(this->values[4]) ? this->values[0] : this->total - this->values[4], size);
    METER_BUFFER_CHECK(buffer, size, written);
 
    METER_BUFFER_APPEND_CHR(buffer, size, '/');
@@ -61,9 +63,16 @@ static void MemoryMeter_display(const Object* cast, RichString* out) {
    RichString_appendAscii(out, CRT_colors[METER_TEXT], " cache:");
    RichString_appendAscii(out, CRT_colors[MEMORY_CACHE], buffer);
 
-   /* available memory is not supported on all platforms */
+   /* shared memory is not supported on all platforms */
    if (!isnan(this->values[3])) {
       Meter_humanUnit(buffer, this->values[3], sizeof(buffer));
+      RichString_appendAscii(out, CRT_colors[METER_TEXT], " shared:");
+      RichString_appendAscii(out, CRT_colors[MEMORY_SHARED], buffer);
+   }
+
+   /* available memory is not supported on all platforms */
+   if (!isnan(this->values[4])) {
+      Meter_humanUnit(buffer, this->values[4], sizeof(buffer));
       RichString_appendAscii(out, CRT_colors[METER_TEXT], " available:");
       RichString_appendAscii(out, CRT_colors[METER_VALUE], buffer);
    }
@@ -77,7 +86,7 @@ const MeterClass MemoryMeter_class = {
    },
    .updateValues = MemoryMeter_updateValues,
    .defaultMode = BAR_METERMODE,
-   .maxItems = 4,
+   .maxItems = 5,
    .total = 100.0,
    .attributes = MemoryMeter_attributes,
    .name = "Memory",

ProcessList.h

@@ -68,6 +68,7 @@ typedef struct ProcessList_ {
    memory_t usedMem;
    memory_t buffersMem;
    memory_t cachedMem;
+   memory_t sharedMem;
    memory_t availableMem;
 
    memory_t totalSwap;

linux/LinuxProcessList.c

@@ -1507,6 +1507,7 @@ static inline void LinuxProcessList_scanMemoryInfo(ProcessList* this) {
    memory_t totalMem = 0;
    memory_t buffersMem = 0;
    memory_t cachedMem = 0;
+   memory_t sharedMem = 0;
    memory_t swapTotalMem = 0;
    memory_t swapCacheMem = 0;
    memory_t swapFreeMem = 0;
@@ -1542,6 +1543,9 @@ static inline void LinuxProcessList_scanMemoryInfo(ProcessList* this) {
          break;
       case 'S':
          switch (buffer[1]) {
+         case 'h':
+            tryRead("Shmem:", sharedMem);
+            break;
          case 'w':
             tryRead("SwapTotal:", swapTotalMem);
             tryRead("SwapCached:", swapCacheMem);
@@ -1565,7 +1569,8 @@ static inline void LinuxProcessList_scanMemoryInfo(ProcessList* this) {
     */
    this->totalMem = totalMem;
    this->cachedMem = cachedMem + sreclaimableMem;
-   const memory_t usedDiff = freeMem + cachedMem + sreclaimableMem + buffersMem;
+   this->sharedMem = sharedMem;
+   const memory_t usedDiff = freeMem + cachedMem + sreclaimableMem + buffersMem + sharedMem;
    this->usedMem = (totalMem >= usedDiff) ? totalMem - usedDiff : totalMem - freeMem;
    this->buffersMem = buffersMem;
    this->availableMem = availableMem != 0 ? MINIMUM(availableMem, totalMem) : freeMem;

linux/Platform.c

@@ -287,7 +287,8 @@ void Platform_setMemoryValues(Meter* this) {
    this->values[0] = pl->usedMem > lpl->totalHugePageMem ? pl->usedMem - lpl->totalHugePageMem : pl->usedMem;
    this->values[1] = pl->buffersMem;
    this->values[2] = pl->cachedMem;
-   this->values[3] = pl->availableMem;
+   this->values[3] = pl->sharedMem;
+   this->values[4] = pl->availableMem;
 
    if (lpl->zfs.enabled != 0) {
       this->values[0] -= lpl->zfs.size;