d/freebsd-skq
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Eliminate acquisitions of the page queues lock that are no longer needed.

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Switch to a per-processor counter for the number of pages freed during
process termination.
This commit is contained in:
Alan Cox 2010-05-07 05:23:15 +00:00
parent 9402dff3de
commit 7072188017
2 changed files with 3 additions and 10 deletions
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2
sys/sys/vmmeter.h
View File

@ -74,7 +74,7 @@ struct vmmeter {
u_int v_tcached; /* (q) total pages cached */
u_int v_dfree; /* (q) pages freed by daemon */
u_int v_pfree; /* (q) pages freed by exiting processes */
u_int v_pfree; /* (p) pages freed by exiting processes */
u_int v_tfree; /* (p) total pages freed */
/*
* Distribution of page usages.

11
sys/vm/vm_object.c
View File

@ -722,14 +722,11 @@ vm_object_terminate(vm_object_t object)
("vm_object_terminate: freeing busy page %p "
"p->busy = %d, p->oflags %x\n", p, p->busy, p->oflags));
vm_page_lock(p);
vm_page_lock_queues();
if (p->wire_count == 0) {
vm_page_free(p);
cnt.v_pfree++;
} else {
PCPU_INC(cnt.v_pfree);
} else
vm_page_remove(p);
}
vm_page_unlock_queues();
vm_page_unlock(p);
}
@ -1634,14 +1631,12 @@ vm_object_backing_scan(vm_object_t object, int op)
* can simply destroy it.
*/
vm_page_lock(p);
vm_page_lock_queues();
KASSERT(!pmap_page_is_mapped(p),
("freeing mapped page %p", p));
if (p->wire_count == 0)
vm_page_free(p);
else
vm_page_remove(p);
vm_page_unlock_queues();
vm_page_unlock(p);
p = next;
continue;
@ -1660,14 +1655,12 @@ vm_object_backing_scan(vm_object_t object, int op)
* Leave the parent's page alone
*/
vm_page_lock(p);
vm_page_lock_queues();
KASSERT(!pmap_page_is_mapped(p),
("freeing mapped page %p", p));
if (p->wire_count == 0)
vm_page_free(p);
else
vm_page_remove(p);
vm_page_unlock_queues();
vm_page_unlock(p);
p = next;
continue;