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On Linux, try to use /proc/loadavg to get instaneous load (#2218) #2268

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On Linux, try to use /proc/loadavg to get instaneous load (#2218) #2268

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30 changes: 30 additions & 0 deletions src/util.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -825,6 +825,36 @@ double GetLoadAverage() {
}
#else
double GetLoadAverage() {
# if defined(__linux__)
// Only try to open the file once.
static int fd = -1;
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if (fd == -1) {
fd = open("/proc/loadavg", O_RDONLY);
if (fd < 0) {
fd = -2;
}
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}

if (fd >= 0) {
char buf[65], *p;
ssize_t nbr = pread(fd, buf, sizeof(buf) - 1, 0);
// Load average should be at least "1 5 9 n/", where we want the "n".
if (nbr > 7) {
buf[nbr] = '\0';
p = strchr(buf, ' ');
if (p) {
p = strchr(p + 1, ' ');
}
if (p) {
p = strchr(p + 1, ' ');
}
if (p && (unsigned(p[1]) - '0' <= 9)) {
return atoi(p + 1);
}
}
}
# endif

double loadavg[3] = { 0.0f, 0.0f, 0.0f };
if (getloadavg(loadavg, 3) < 0) {
// Maybe we should return an error here or the availability of
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