htop/DiskIOMeter.c

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/*
htop - DiskIOMeter.c
(C) 2020 Christian Göttsche
Released under the GNU GPLv2, see the COPYING file
in the source distribution for its full text.
*/
#include "DiskIOMeter.h"
#include <math.h>
#include "CRT.h"
#include "Platform.h"
static const int DiskIOMeter_attributes[] = {
DISKIO_UTIL_HIGH,
DISKIO_READ,
DISKIO_WRITE,
};
static unsigned long int cached_read_diff = 0;
static unsigned long int cached_write_diff = 0;
static double cached_utilisation_diff = 0.0;
static void DiskIOMeter_updateValues(Meter* this, char* buffer, int len) {
static unsigned long int cached_read_total = 0;
static unsigned long int cached_write_total = 0;
static unsigned long int cached_msTimeSpend_total = 0;
static unsigned long long int cached_last_update = 0;
struct timeval tv;
gettimeofday(&tv, NULL);
unsigned long long int timeInMilliSeconds = (unsigned long long int)tv.tv_sec * 1000 + (unsigned long long int)tv.tv_usec / 1000;
/* update only every 500ms */
if (timeInMilliSeconds - cached_last_update > 500) {
unsigned long int bytesRead, bytesWrite, msTimeSpend;
Platform_getDiskIO(&bytesRead, &bytesWrite, &msTimeSpend);
cached_read_diff = (bytesRead - cached_read_total) / 1024; /* Meter_humanUnit() expects unit in kilo */
cached_read_total = bytesRead;
cached_write_diff = (bytesWrite - cached_write_total) / 1024; /* Meter_humanUnit() expects unit in kilo */
cached_write_total = bytesWrite;
cached_utilisation_diff = 100 * (double)(msTimeSpend - cached_msTimeSpend_total) / (timeInMilliSeconds - cached_last_update);
cached_last_update = timeInMilliSeconds;
cached_msTimeSpend_total = msTimeSpend;
}
this->values[0] = cached_utilisation_diff;
this->total = MAXIMUM(this->values[0], 100.0); /* fix total after (initial) spike */
char bufferRead[12], bufferWrite[12];
Meter_humanUnit(bufferRead, cached_read_diff, sizeof(bufferRead));
Meter_humanUnit(bufferWrite, cached_write_diff, sizeof(bufferWrite));
snprintf(buffer, len, "%sB %sB %.1f%%", bufferRead, bufferWrite, cached_utilisation_diff);
}
static void DIskIOMeter_display(ATTR_UNUSED const Object* cast, RichString* out) {
char buffer[16];
int color = cached_utilisation_diff > 40.0 ? DISKIO_UTIL_HIGH : METER_VALUE;
xSnprintf(buffer, sizeof(buffer), "%.1f%%", cached_utilisation_diff);
RichString_write(out, CRT_colors[color], buffer);
RichString_append(out, CRT_colors[METER_TEXT], " read: ");
Meter_humanUnit(buffer, cached_read_diff, sizeof(buffer));
RichString_append(out, CRT_colors[DISKIO_READ], buffer);
RichString_append(out, CRT_colors[METER_TEXT], " write: ");
Meter_humanUnit(buffer, cached_write_diff, sizeof(buffer));
RichString_append(out, CRT_colors[DISKIO_WRITE], buffer);
}
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const MeterClass DiskIOMeter_class = {
.super = {
.extends = Class(Meter),
.delete = Meter_delete,
.display = DIskIOMeter_display
},
.updateValues = DiskIOMeter_updateValues,
.defaultMode = TEXT_METERMODE,
.maxItems = 1,
.total = 100.0,
.attributes = DiskIOMeter_attributes,
.name = "DiskIO",
.uiName = "Disk IO",
.caption = "Disk IO: "
};