diff options
| author | dyson <dyson@FreeBSD.org> | 1996-05-19 07:36:50 +0000 |
|---|---|---|
| committer | dyson <dyson@FreeBSD.org> | 1996-05-19 07:36:50 +0000 |
| commit | d3600176f48ca801e31f738ce5c37c51e3b30fe3 (patch) | |
| tree | d5aabcba7719875b5a0f874d310c6f63ca671595 /sys/vm/vm_fault.c | |
| parent | 7959948e53f05489f9a248339725ac7918aa2968 (diff) | |
| download | FreeBSD-src-d3600176f48ca801e31f738ce5c37c51e3b30fe3.zip FreeBSD-src-d3600176f48ca801e31f738ce5c37c51e3b30fe3.tar.gz | |
Initial support for mincore and madvise. Both are almost fully
supported, except madvise does not page in with MADV_WILLNEED, and
MADV_DONTNEED doesn't force dirty pages out.
Diffstat (limited to 'sys/vm/vm_fault.c')
| -rw-r--r-- | sys/vm/vm_fault.c | 46 |
1 files changed, 43 insertions, 3 deletions
diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c index 904270b..05b9bf9 100644 --- a/sys/vm/vm_fault.c +++ b/sys/vm/vm_fault.c @@ -66,7 +66,7 @@ * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. * - * $Id: vm_fault.c,v 1.43 1996/03/28 04:53:23 dyson Exp $ + * $Id: vm_fault.c,v 1.44 1996/05/18 03:37:35 dyson Exp $ */ /* @@ -324,6 +324,47 @@ readrest: int rv; int faultcount; int reqpage; + int ahead, behind; + + ahead = VM_FAULT_READ_AHEAD; + behind = VM_FAULT_READ_BEHIND; + if (first_object->behavior == OBJ_RANDOM) { + ahead = 0; + behind = 0; + } + + if (first_object->behavior == OBJ_SEQUENTIAL) { + vm_pindex_t firstpindex, tmppindex; + if (first_pindex < + 2*(VM_FAULT_READ_BEHIND + VM_FAULT_READ_AHEAD + 1)) + firstpindex = 0; + else + firstpindex = first_pindex - + 2*(VM_FAULT_READ_BEHIND + VM_FAULT_READ_AHEAD + 1); + + for(tmppindex = first_pindex - 1; + tmppindex >= first_pindex; + --tmppindex) { + vm_page_t mt; + mt = vm_page_lookup( first_object, tmppindex); + if (mt == NULL || (mt->valid != VM_PAGE_BITS_ALL)) + break; + if (mt->busy || (mt->flags & PG_BUSY) || mt->hold_count || + mt->wire_count) + continue; + if (mt->dirty == 0) + vm_page_test_dirty(mt); + if (mt->dirty) { + vm_page_protect(mt, VM_PROT_NONE); + vm_page_deactivate(mt); + } else { + vm_page_cache(mt); + } + } + + ahead += behind; + behind = 0; + } /* * now we find out if any other pages should be paged @@ -338,8 +379,7 @@ readrest: * vm_page_t passed to the routine. */ faultcount = vm_fault_additional_pages( - m, VM_FAULT_READ_BEHIND, VM_FAULT_READ_AHEAD, - marray, &reqpage); + m, behind, ahead, marray, &reqpage); /* * Call the pager to retrieve the data, if any, after |
