Author: kib
Date: Wed Dec 21 09:18:53 2016
New Revision: 310358
URL: https://svnweb.freebsd.org/changeset/base/310358
Log:
MFC r310098:
Provide introductory description of the default pager.
Modified:
stable/11/sys/vm/default_pager.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/vm/default_pager.c
==============================================================================
--- stable/11/sys/vm/default_pager.c Wed Dec 21 09:15:25 2016
(r310357)
+++ stable/11/sys/vm/default_pager.c Wed Dec 21 09:18:53 2016
(r310358)
@@ -63,6 +63,16 @@ static boolean_t default_pager_haspage(v
int *);
/*
* pagerops for OBJT_DEFAULT - "default pager".
+ *
+ * This pager handles anonymous (no handle) swap-backed memory, just
+ * like the swap pager. It allows several optimizations based on the
+ * fact that no pages of a default object can be swapped out. The
+ * most important optimization is in vm_fault(), where the pager is
+ * never asked for a non-resident page. Instead, a freshly allocated
+ * zeroed page is used.
+ *
+ * On the first request to page out a page from a default object, the
+ * object is converted to swap pager type.
*/
struct pagerops defaultpagerops = {
.pgo_alloc = default_pager_alloc,
_______________________________________________
svn-src-all@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-all
To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
