Date: Sun, 17 May 2009 20:40:41 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r192261 - head/sys/vm Message-ID: <200905172040.n4HKef0x039171@svn.freebsd.org>
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Author: alc Date: Sun May 17 20:40:41 2009 New Revision: 192261 URL: http://svn.freebsd.org/changeset/base/192261 Log: Eliminate a pointless call to pmap_clear_reference() from vm_pageout_scan(). If the page belongs to an object with a reference count of zero, then it can't have any managed mappings on which to clear a reference bit. Modified: head/sys/vm/vm_pageout.c Modified: head/sys/vm/vm_pageout.c ============================================================================== --- head/sys/vm/vm_pageout.c Sun May 17 20:26:00 2009 (r192260) +++ head/sys/vm/vm_pageout.c Sun May 17 20:40:41 2009 (r192261) @@ -786,7 +786,8 @@ rescan0: */ if (object->ref_count == 0) { vm_page_flag_clear(m, PG_REFERENCED); - pmap_clear_reference(m); + KASSERT(!pmap_page_is_mapped(m), + ("vm_pageout_scan: page %p is mapped", m)); /* * Otherwise, if the page has been referenced while in the
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