On Wed, 21 Dec 2016 11:32:09 +0000 (UTC) Konstantin Belousov <k...@freebsd.org> wrote:
> Author: kib > Date: Wed Dec 21 11:32:08 2016 > New Revision: 310363 > URL: https://svnweb.freebsd.org/changeset/base/310363 > > Log: > MFC r310098: > Provide introductory description of the default pager. > > Modified: > stable/10/sys/vm/default_pager.c > Directory Properties: > stable/10/ (props changed) > > Modified: stable/10/sys/vm/default_pager.c > ============================================================================== > --- stable/10/sys/vm/default_pager.c Wed Dec 21 09:59:55 2016 > (r310362) > +++ stable/10/sys/vm/default_pager.c Wed Dec 21 11:32:08 2016 > (r310363) > @@ -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, > r310097 not need to merge it? -- Hiroshi Yoshida _______________________________________________ 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"
