patch vm-cleanup

*** 1122,1213 ****
          ASSERT(old != kas.a_hat);
          return (0);
  }
  
  /*
-  * Allocate any hat resources required for a process being swapped in.
-  */
- /*ARGSUSED*/
- void
- hat_swapin(hat_t *hat)
- {
-         /* do nothing - we let everything fault back in */
- }
- 
- /*
-  * Unload all translations associated with an address space of a process
-  * that is being swapped out.
-  */
- void
- hat_swapout(hat_t *hat)
- {
-         uintptr_t       vaddr = (uintptr_t)0;
-         uintptr_t       eaddr = _userlimit;
-         htable_t        *ht = NULL;
-         level_t         l;
- 
-         XPV_DISALLOW_MIGRATE();
-         /*
-          * We can't just call hat_unload(hat, 0, _userlimit...)  here, because
-          * seg_spt and shared pagetables can't be swapped out.
-          * Take a look at segspt_shmswapout() - it's a big no-op.
-          *
-          * Instead we'll walk through all the address space and unload
-          * any mappings which we are sure are not shared, not locked.
-          */
-         ASSERT(IS_PAGEALIGNED(vaddr));
-         ASSERT(IS_PAGEALIGNED(eaddr));
-         ASSERT(AS_LOCK_HELD(hat->hat_as, &hat->hat_as->a_lock));
-         if ((uintptr_t)hat->hat_as->a_userlimit < eaddr)
-                 eaddr = (uintptr_t)hat->hat_as->a_userlimit;
- 
-         while (vaddr < eaddr) {
-                 (void) htable_walk(hat, &ht, &vaddr, eaddr);
-                 if (ht == NULL)
-                         break;
- 
-                 ASSERT(!IN_VA_HOLE(vaddr));
- 
-                 /*
-                  * If the page table is shared skip its entire range.
-                  */
-                 l = ht->ht_level;
-                 if (ht->ht_flags & HTABLE_SHARED_PFN) {
-                         vaddr = ht->ht_vaddr + LEVEL_SIZE(l + 1);
-                         htable_release(ht);
-                         ht = NULL;
-                         continue;
-                 }
- 
-                 /*
-                  * If the page table has no locked entries, unload this one.
-                  */
-                 if (ht->ht_lock_cnt == 0)
-                         hat_unload(hat, (caddr_t)vaddr, LEVEL_SIZE(l),
-                             HAT_UNLOAD_UNMAP);
- 
-                 /*
-                  * If we have a level 0 page table with locked entries,
-                  * skip the entire page table, otherwise skip just one entry.
-                  */
-                 if (ht->ht_lock_cnt > 0 && l == 0)
-                         vaddr = ht->ht_vaddr + LEVEL_SIZE(1);
-                 else
-                         vaddr += LEVEL_SIZE(l);
-         }
-         if (ht)
-                 htable_release(ht);
- 
-         /*
-          * We're in swapout because the system is low on memory, so
-          * go back and flush all the htables off the cached list.
-          */
-         htable_purge_hat(hat);
-         XPV_ALLOW_MIGRATE();
- }
- 
- /*
   * returns number of bytes that have valid mappings in hat.
   */
  size_t
  hat_get_mapped_size(hat_t *hat)
  {
--- 1122,1131 ----