/*
* lpage_evict: Evict an lpage from physical memory.
*
* Synchronization: lock the lpage while accessing it. We come here
* from the coremap and should have the global paging lock and should
* have pinned the physical page (see coremap.c:do_evict()).
* This is why we must not hold lpage locks while entering the coremap code.
*
* Similar to lpage_fault, the lpage lock should not be held while performing
* the page out (if one is needed).
*/
void
lpage_evict(struct lpage *lp)
{
paddr_t pa;
off_t swapaddr;
KASSERT(lock_do_i_hold(global_paging_lock));
KASSERT(lp != NULL);
lpage_lock(lp);
swapaddr = lp->lp_swapaddr;
pa = lp->lp_paddr & PAGE_FRAME;
KASSERT(pa != INVALID_PADDR);
if (LP_ISDIRTY(lp)) {
lpage_unlock(lp);
LP_CLEAR(lp, LPF_DIRTY);
swap_pageout(pa, swapaddr);
lpage_lock(lp);
}
lp->lp_paddr = INVALID_PADDR;
lpage_unlock(lp);
}
/*
* lpage_evict: Evict an lpage from physical memory.
*
* Synchronization: lock the lpage while accessing it. We come here
* from the coremap and should have the global paging lock and should
* have pinned the physical page (see coremap.c:do_evict()).
* This is why we must not hold lpage locks while entering the coremap code.
*
* Similar to lpage_fault, the lpage lock should not be held while performing
* the page out (if one is needed).
*/
void
lpage_evict(struct lpage *lp)
{
paddr_t physical_address;
off_t swap_address;
// Lock the lpage while accessing it.
KASSERT(lp != NULL);
lpage_lock(lp);
// Obtain the physical & swap address'
physical_address = lp->lp_paddr & PAGE_FRAME;
swap_address = lp->lp_swapaddr;
// If the page is stored in RAM memory...
if (physical_address != INVALID_PADDR) {
DEBUG(DB_VM, "lpage_evict: Moving page from paddr 0x%x to swapaddr 0x%llx\n", physical_address, swap_address);
// If page is dirty..
if (LP_ISDIRTY(lp)) {
// Move page into swapspace.
lpage_unlock(lp);
swap_pageout(physical_address, swap_address);
LP_CLEAR(lp, LPF_DIRTY);
lpage_lock(lp);
}
// Remove page from physical memory.
lp->lp_paddr = INVALID_PADDR;
lpage_unlock(lp);
}
else {
lpage_unlock(lp);
}
}
