/*
* The page_retire_thread loops forever, looking to see if there are
* pages still waiting to be retired.
*/
static void
page_retire_thread(void)
{
callb_cpr_t c;
CALLB_CPR_INIT(&c, &pr_thread_mutex, callb_generic_cpr, "page_retire");
mutex_enter(&pr_thread_mutex);
for (;;) {
if (pr_enable && PR_KSTAT_PENDING) {
/*
* Sigh. It's SO broken how we have to try to shake
* loose the holder of the page. Since we have no
* idea who or what has it locked, we go bang on
* every door in the city to try to locate it.
*/
kmem_reap();
seg_preap();
page_retire_hunt(page_retire_thread_cb);
CALLB_CPR_SAFE_BEGIN(&c);
(void) cv_timedwait(&pr_cv, &pr_thread_mutex,
lbolt + pr_thread_shortwait);
CALLB_CPR_SAFE_END(&c, &pr_thread_mutex);
} else {
CALLB_CPR_SAFE_BEGIN(&c);
(void) cv_timedwait(&pr_cv, &pr_thread_mutex,
lbolt + pr_thread_longwait);
CALLB_CPR_SAFE_END(&c, &pr_thread_mutex);
}
}
/*NOTREACHED*/
}
/*
* Schedule rate for paging.
* Rate is linear interpolation between
* slowscan with lotsfree and fastscan when out of memory.
*/
static void
schedpaging(void *arg)
{
spgcnt_t vavail;
if (freemem < lotsfree + needfree + kmem_reapahead)
kmem_reap();
if (freemem < lotsfree + needfree + seg_preapahead)
seg_preap();
if (kcage_on && (kcage_freemem < kcage_desfree || kcage_needfree))
kcage_cageout_wakeup();
if (mutex_tryenter(&pageout_mutex)) {
/* pageout() not running */
nscan = 0;
vavail = freemem - deficit;
if (vavail < 0)
vavail = 0;
if (vavail > lotsfree)
vavail = lotsfree;
/*
* Fix for 1161438 (CRS SPR# 73922). All variables
* in the original calculation for desscan were 32 bit signed
* ints. As freemem approaches 0x0 on a system with 1 Gig or
* more of memory, the calculation can overflow. When this
* happens, desscan becomes negative and pageout_scanner()
* stops paging out.
*/
if (needfree) {
desscan = fastscan / RATETOSCHEDPAGING;
} else {
spgcnt_t faststmp, slowstmp, result;
slowstmp = slowscan * vavail;
faststmp = fastscan * (lotsfree - vavail);
result = (slowstmp + faststmp) /
nz(lotsfree) / RATETOSCHEDPAGING;
desscan = (pgcnt_t)result;
}
pageout_ticks = min_pageout_ticks + (lotsfree - vavail) *
(max_pageout_ticks - min_pageout_ticks) / nz(lotsfree);
if (freemem < lotsfree + needfree ||
pageout_sample_cnt < pageout_sample_lim) {
TRACE_1(TR_FAC_VM, TR_PAGEOUT_CV_SIGNAL,
"pageout_cv_signal:freemem %ld", freemem);
cv_signal(&proc_pageout->p_cv);
} else {
/*
* There are enough free pages, no need to
* kick the scanner thread. And next time
* around, keep more of the `highly shared'
* pages.
*/
cv_signal_pageout();
if (po_share > MIN_PO_SHARE) {
po_share >>= 1;
}
}
