FreeBSD source tree https://cgit-dev.freebsd.org/src-test2/atom?h=stable%2F5 2005-01-31T23:27:04Z 2005-01-31T23:27:04Z Warner Losh imp@FreeBSD.org 2005-01-31T23:27:04Z urn:sha1:c9769f3ab5327a99909391e070c143e92ddc43ec 2004-10-10T19:08:00Z Alan Cox alc@FreeBSD.org 2004-10-10T19:08:00Z urn:sha1:267b92e122a63846a24d14e0eb112e63f067abe7 amd64 and i386 - Remove unnecessary checks for curthread == NULL and pmap == NULL. - Release the page queues lock earlier in pmap_protect() and pmap_remove() in order to reduce contention. - Remove an outdated assertion from _pmap_allocpte(). - Simplify the reference counting of page table pages. Specifically, use the page table page's wired count rather than its hold count to contain the reference count. - Prevent the unexpected deallocation of a page table page while performing pmap_copy(). - Eliminate the unnecessary masking of the page offset bits from the physical address that is stored in the vm_page. - Undo revision 1.251. This change was a performance pessimizing work- around that is no longer required. Now, if the preexisting PTE is invalid, pmap_enter() does not call pmap_invalidate_page() to update the TLB(s). - Make pte_load_store() an atomic operation in all cases, not just i386 PAE. - Restructure pmap_enter() to prevent the loss of a page modified (PG_M) bit in a race between processors. (This restructuring assumes the newly atomic pte_load_store() for correct operation.) amd64 only - It is now an error to call pmap_unuse_pt without the paddr of the pde that contained the pte. - Remove an unused declaration. i386 only - Modify pmap_pte() to support its use on non-current, non-kernel pmaps without holding Giant. Approved by: re (scottl) 2004-10-09T03:00:17Z Scott Long scottl@FreeBSD.org 2004-10-09T03:00:17Z urn:sha1:43dd15c596f1528b92ef5972b894838f62c04798 Approved by: re 2004-06-29T15:57:05Z Peter Wemm peter@FreeBSD.org 2004-06-29T15:57:05Z urn:sha1:654bd0e802fbda5afc7372b44842849beabd7674 pv entries per 1GB of user virtual memory. (eg: if we had 1GB file was mmaped into 30 processes, that would theoretically reduce the KVA demand by 30MB for pv entries. In reality though, we limit pv entries so we don't have that many at once.) We used to store the vm_page_t for the page table page. But we recently had the pa of the ptp, or can calculate it fairly quickly. If we wanted to avoid the shift/mask operation in pmap_pde(), we could recover the pa but that means we have to store it for a while. This does not measurably change performance. Suggested by: alc Tested by: alc 2004-06-20T00:33:14Z Bruce Evans bde@FreeBSD.org 2004-06-20T00:33:14Z urn:sha1:4df7435a7881bc697d1118dcc9eb018f56bb76ba former, not after. 2004-06-16T07:03:15Z Alan Cox alc@FreeBSD.org 2004-06-16T07:03:15Z urn:sha1:4d831945a7d914509767ff24f52e6273be13d81b Introduce pmap locking to many of the pmap functions. 2004-06-13T03:44:11Z Alan Cox alc@FreeBSD.org 2004-06-13T03:44:11Z urn:sha1:8559e0a2913d557aed0193e0f255b4ac0f2772ac - Move a definition inside the scope of a #ifdef _KERNEL. 2004-04-10T23:28:49Z Alan Cox alc@FreeBSD.org 2004-04-10T23:28:49Z urn:sha1:0af0eeacb693f468f48cfff35f242c243e35bd59 should be declared as vm_paddr_t not vm_offset_t. 2004-04-10T22:41:46Z Alan Cox alc@FreeBSD.org 2004-04-10T22:41:46Z urn:sha1:b14d6acced991c56cdee9bab37fd877aac79ffc9 move its declaration to the machine-dependent header file on those machines that use it. In principle, only i386 should have it. Alpha and AMD64 should use their direct virtual-to-physical mapping. - Remove pmap_kenter_temporary() from ia64. It is unused. Approved by: marcel@ 2004-04-07T20:46:16Z Warner Losh imp@FreeBSD.org 2004-04-07T20:46:16Z urn:sha1:f36cfd49adb62472fd7009ecd4f0927c126ff785 license, per letter dated July 22, 1999 and email from Peter Wemm, Alan Cox and Robert Watson. Approved by: core, peter, alc, rwatson