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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 "config.h" // IWYU pragma: keep
#include "DiskIOMeter.h"
#include <stdbool.h>
#include "CRT.h"
#include "Machine.h"
#include "Macros.h"
#include "Object.h"
#include "Platform.h"
#include "RichString.h"
#include "Row.h"
#include "XUtils.h"
static const int DiskIOMeter_attributes[] = {
METER_VALUE_NOTICE,
METER_VALUE_IOREAD,
METER_VALUE_IOWRITE,
};
static MeterRateStatus status = RATESTATUS_INIT;
static char cached_read_diff_str[6];
static char cached_write_diff_str[6];
static double cached_utilisation_diff;
static void DiskIOMeter_updateValues(Meter* this) {
const Machine* host = this->host;
static uint64_t cached_last_update;
uint64_t passedTimeInMs = host->realtimeMs - cached_last_update;
bool hasNewData = false;
DiskIOData data;
/* update only every 500ms to have a sane span for rate calculation */
if (passedTimeInMs > 500) {
hasNewData = Platform_getDiskIO(&data);
if (!hasNewData) {
status = RATESTATUS_NODATA;
} else if (cached_last_update == 0) {
status = RATESTATUS_INIT;
} else if (passedTimeInMs > 30000) {
status = RATESTATUS_STALE;
} else {
status = RATESTATUS_DATA;
}
cached_last_update = host->realtimeMs;
}
if (hasNewData) {
static uint64_t cached_read_total;
static uint64_t cached_write_total;
static uint64_t cached_msTimeSpend_total;
if (status != RATESTATUS_INIT) {
uint64_t diff;
if (data.totalBytesRead > cached_read_total) {
diff = data.totalBytesRead - cached_read_total;
diff = (1000 * diff) / passedTimeInMs; /* convert to B/s */
diff /= ONE_K; /* convert to KiB/s */
} else {
diff = 0;
}
Meter_humanUnit(cached_read_diff_str, diff, sizeof(cached_read_diff_str));
if (data.totalBytesWritten > cached_write_total) {
diff = data.totalBytesWritten - cached_write_total;
diff = (1000 * diff) / passedTimeInMs; /* convert to B/s */
diff /= ONE_K; /* convert to KiB/s */
} else {
diff = 0;
}
Meter_humanUnit(cached_write_diff_str, diff, sizeof(cached_write_diff_str));
if (data.totalMsTimeSpend > cached_msTimeSpend_total) {
diff = data.totalMsTimeSpend - cached_msTimeSpend_total;
cached_utilisation_diff = 100.0 * (double)diff / passedTimeInMs;
cached_utilisation_diff = MINIMUM(cached_utilisation_diff, 100.0);
} else {
cached_utilisation_diff = 0.0;
}
}
cached_read_total = data.totalBytesRead;
cached_write_total = data.totalBytesWritten;
cached_msTimeSpend_total = data.totalMsTimeSpend;
}
this->values[0] = cached_utilisation_diff;
if (status == RATESTATUS_NODATA) {
xSnprintf(this->txtBuffer, sizeof(this->txtBuffer), "no data");
return;
}
if (status == RATESTATUS_INIT) {
xSnprintf(this->txtBuffer, sizeof(this->txtBuffer), "init");
return;
}
if (status == RATESTATUS_STALE) {
xSnprintf(this->txtBuffer, sizeof(this->txtBuffer), "stale");
return;
}
xSnprintf(this->txtBuffer, sizeof(this->txtBuffer), "r:%siB/s w:%siB/s %.1f%%", cached_read_diff_str, cached_write_diff_str, cached_utilisation_diff);
}
static void DiskIOMeter_display(ATTR_UNUSED const Object* cast, RichString* out) {
switch (status) {
case RATESTATUS_NODATA:
RichString_writeAscii(out, CRT_colors[METER_VALUE_ERROR], "no data");
return;
case RATESTATUS_INIT:
RichString_writeAscii(out, CRT_colors[METER_VALUE], "initializing...");
return;
case RATESTATUS_STALE:
RichString_writeAscii(out, CRT_colors[METER_VALUE_WARN], "stale data");
return;
case RATESTATUS_DATA:
break;
}
char buffer[16];
int color = cached_utilisation_diff > 40.0 ? METER_VALUE_NOTICE : METER_VALUE;
int len = xSnprintf(buffer, sizeof(buffer), "%.1f%%", cached_utilisation_diff);
RichString_appendnAscii(out, CRT_colors[color], buffer, len);
RichString_appendAscii(out, CRT_colors[METER_TEXT], " read: ");
RichString_appendAscii(out, CRT_colors[METER_VALUE_IOREAD], cached_read_diff_str);
RichString_appendAscii(out, CRT_colors[METER_VALUE_IOREAD], "iB/s");
RichString_appendAscii(out, CRT_colors[METER_TEXT], " write: ");
RichString_appendAscii(out, CRT_colors[METER_VALUE_IOWRITE], cached_write_diff_str);
RichString_appendAscii(out, CRT_colors[METER_VALUE_IOWRITE], "iB/s");
}
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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