Date: Thu, 22 Dec 2016 07:09:52 +0900 From: Hiroshi Yoshida <ys-h@sea.plala.or.jp> To: svn-src-all@freebsd.org Subject: Re: svn commit: r310363 - stable/10/sys/vm Message-ID: <20161222070952.eca6bc2a567f88292f686e99@sea.plala.or.jp> In-Reply-To: <201612211132.uBLBW9Ud019011@repo.freebsd.org> References: <201612211132.uBLBW9Ud019011@repo.freebsd.org>
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On Wed, 21 Dec 2016 11:32:09 +0000 (UTC) Konstantin Belousov <kib@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
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