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dynamic HZ

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This commit is contained in:
Ben Gras 2008-12-11 14:37:18 +00:00
parent eae27c899a
commit 991000dd70
1 changed files with 10 additions and 1 deletions
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11
lib/posix/getloadavg.c
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@ -9,16 +9,25 @@
int getloadavg(double *loadavg, int nelem) int getloadavg(double *loadavg, int nelem)
{ {
struct loadinfo loadinfo; struct loadinfo loadinfo;
static u32_t system_hz = 0;
int h, p, unfilled_ticks; int h, p, unfilled_ticks;
#define PERIODS 3 #define PERIODS 3
int minutes[3] = { 1, 5, 15 }; int minutes[3] = { 1, 5, 15 };
size_t loadsize; size_t loadsize;
ssize_t l; ssize_t l;
if(nelem < 1) { if(nelem < 1) {
errno = ENOSPC; errno = ENOSPC;
return -1; return -1;
} }
if(system_hz == 0) {
if((getsysinfo_up(PM_PROC_NR, SIU_SYSTEMHZ,
sizeof(system_hz), &system_hz)) < 0) {
system_hz = DEFAULT_HZ;
}
}
loadsize = sizeof(loadinfo); loadsize = sizeof(loadinfo);
if((l=getsysinfo_up(PM_PROC_NR, SIU_LOADINFO, loadsize, &loadinfo)) < 0) if((l=getsysinfo_up(PM_PROC_NR, SIU_LOADINFO, loadsize, &loadinfo)) < 0)
return -1; return -1;
@ -28,7 +37,7 @@ int getloadavg(double *loadavg, int nelem)
nelem = PERIODS; nelem = PERIODS;
/* How many ticks are missing from the newest-filled slot? */ /* How many ticks are missing from the newest-filled slot? */
#define TICKSPERSLOT (_LOAD_UNIT_SECS * sys_hz()) #define TICKSPERSLOT (_LOAD_UNIT_SECS * system_hz)
unfilled_ticks = TICKSPERSLOT - (loadinfo.last_clock % TICKSPERSLOT); unfilled_ticks = TICKSPERSLOT - (loadinfo.last_clock % TICKSPERSLOT);
for(p = 0; p < nelem; p++) { for(p = 0; p < nelem; p++) {