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/*
htop - DiskIOMeter.c
(C) 2020 htop dev team
Released under the GNU GPLv2, see the COPYING file
in the source distribution for its full text.
*/
#include "DiskIOMeter.h"
#include <stdbool.h>
#include <stdio.h>
#include <sys/time.h>
#include "CRT.h"
#include "Macros.h"
#include "Object.h"
#include "Platform.h"
#include "RichString.h"
#include "XUtils.h"
static const int DiskIOMeter_attributes[] = {
METER_VALUE_NOTICE,
METER_VALUE_IOREAD,
METER_VALUE_IOWRITE,
};
static bool hasData = false;
static unsigned long int cached_read_diff;
static unsigned long int cached_write_diff;
static double cached_utilisation_diff;
static void DiskIOMeter_updateValues(Meter* this, char* buffer, size_t len) {
static unsigned long long int cached_last_update;
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;
unsigned long long int passedTimeInMs = timeInMilliSeconds - cached_last_update;
/* update only every 500ms */
if (passedTimeInMs > 500) {
static unsigned long long int cached_read_total;
static unsigned long long int cached_write_total;
static unsigned long long int cached_msTimeSpend_total;
unsigned long long int diff;
cached_last_update = timeInMilliSeconds;
DiskIOData data;
hasData = Platform_getDiskIO(&data);
if (!hasData) {
this->values[0] = 0;
xSnprintf(buffer, len, "no data");
return;
}
if (data.totalBytesRead > cached_read_total) {
diff = data.totalBytesRead - cached_read_total;
diff /= 1024; /* Meter_humanUnit() expects unit in kilo */
cached_read_diff = (unsigned int)diff;
} else {
cached_read_diff = 0UL;
}
cached_read_total = data.totalBytesRead;
if (data.totalBytesWritten > cached_write_total) {
diff = data.totalBytesWritten - cached_write_total;
diff /= 1024; /* Meter_humanUnit() expects unit in kilo */
cached_write_diff = (unsigned int)diff;
} else {
cached_write_diff = 0UL;
}
cached_write_total = data.totalBytesWritten;
if (data.totalMsTimeSpend > cached_msTimeSpend_total) {
diff = data.totalMsTimeSpend - cached_msTimeSpend_total;
cached_utilisation_diff = 100.0 * (double)diff / passedTimeInMs;
} else {
cached_utilisation_diff = 0.0;
}
cached_msTimeSpend_total = data.totalMsTimeSpend;
}
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) {
if (!hasData) {
RichString_writeAscii(out, CRT_colors[METER_VALUE_ERROR], "no data");
return;
}
char buffer[16];
int color = cached_utilisation_diff > 40.0 ? METER_VALUE_NOTICE : METER_VALUE;
xSnprintf(buffer, sizeof(buffer), "%.1f%%", cached_utilisation_diff);
RichString_writeAscii(out, CRT_colors[color], buffer);
RichString_appendAscii(out, CRT_colors[METER_TEXT], " read: ");
Meter_humanUnit(buffer, cached_read_diff, sizeof(buffer));
RichString_appendAscii(out, CRT_colors[METER_VALUE_IOREAD], buffer);
RichString_appendAscii(out, CRT_colors[METER_TEXT], " write: ");
Meter_humanUnit(buffer, cached_write_diff, sizeof(buffer));
RichString_appendAscii(out, CRT_colors[METER_VALUE_IOWRITE], buffer);
}
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: "
};
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