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- Replace two instances of vm_page_sleep_busy() with the page queue

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mutex-friendly vm_page_sleep_if_busy().
 - Introduce page queue locking in pmap_page_lookup() and
   pmap_release_free_page().
 - Simplify the invalidation of the pmap's ptphint in
   pmap_release_free_page().  (MFi386 pmap.c revision 1.362.)
This commit is contained in:
Alan Cox 2002-10-20 21:40:17 +00:00
parent ce2fb5776b
commit f3a01463b9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=105562
1 changed files with 10 additions and 4 deletions
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14
sys/alpha/alpha/pmap.c
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@ -893,8 +893,12 @@ pmap_page_lookup(vm_object_t object, vm_pindex_t pindex)
vm_page_t m;
retry:
m = vm_page_lookup(object, pindex);
if (m && vm_page_sleep_busy(m, FALSE, "pplookp"))
goto retry;
if (m != NULL) {
vm_page_lock_queues();
if (vm_page_sleep_if_busy(m, FALSE, "pplookp"))
goto retry;
vm_page_unlock_queues();
}
return m;
}
@ -1338,7 +1342,8 @@ pmap_release_free_page(pmap_t pmap, vm_page_t p)
* page-table pages. Those pages are zero now, and
* might as well be placed directly into the zero queue.
*/
if (vm_page_sleep_busy(p, FALSE, "pmaprl"))
vm_page_lock_queues();
if (vm_page_sleep_if_busy(p, FALSE, "pmaprl"))
return 0;
vm_page_busy(p);
@ -1361,7 +1366,7 @@ pmap_release_free_page(pmap_t pmap, vm_page_t p)
if (p->pindex == NUSERLEV3MAPS + NUSERLEV2MAPS)
bzero(pmap->pm_lev1 + K1SEGLEV1I, nklev2 * PTESIZE);
if (pmap->pm_ptphint && (pmap->pm_ptphint->pindex == p->pindex))
if (pmap->pm_ptphint == p)
pmap->pm_ptphint = NULL;
#ifdef PMAP_DEBUG
@ -1377,6 +1382,7 @@ pmap_release_free_page(pmap_t pmap, vm_page_t p)
p->wire_count--;
cnt.v_wire_count--;
vm_page_free_zero(p);
vm_page_unlock_queues();
return 1;
}