void
pmcupdate(Mach *m)
{
PmcCtr *p;
int i, maxct, wk;
PmcWait *w;
return;
maxct = pmcnregs();
for (i = 0; i < maxct; i++) {
p = &m->pmc[i];
ilock(&m->pmclock);
if(p->ctrset & PmcSet)
setctr(p->ctr, i);
if(p->ctlset & PmcSet)
setctl(&p->PmcCtl, i);
p->ctr = getctr(i);
getctl(&p->PmcCtl, i);
p->ctrset = PmcIgn;
p->ctlset = PmcIgn;
wk = p->stale;
p->stale = 0;
if(wk){
for(w = p->wq; w != nil; w = w->next){
p->wq = w->next;
wakeup(&w->rend);
pmcwclose(w);
}
}
iunlock(&m->pmclock);
}
}
static void
waitnotstale(Mach *mp, PmcCtr *p)
{
PmcWait *w;
w = newpmcw();
w->next = p->wq;
p->wq = w;
incref(w);
iunlock(&mp->pmclock);
apicipi(mp->apicno);
if(waserror()){
pmcwclose(w);
nexterror();
}
sleep(&w->r, notstale, p);
poperror();
pmcwclose(w);
}
