diff options
| author | dyson <dyson@FreeBSD.org> | 1996-12-31 16:23:38 +0000 |
|---|---|---|
| committer | dyson <dyson@FreeBSD.org> | 1996-12-31 16:23:38 +0000 |
| commit | b7fce42185d7564b4b32dfce1313242f80ad1d36 (patch) | |
| tree | 19f238cfc4e39aca545694bd3418e0c4f2b4a19e /sys/vm/vm_object.c | |
| parent | b633be6a43d88ff9acc01d4e5156940ad2766420 (diff) | |
| download | FreeBSD-src-b7fce42185d7564b4b32dfce1313242f80ad1d36.zip FreeBSD-src-b7fce42185d7564b4b32dfce1313242f80ad1d36.tar.gz | |
A very significant improvement in the management of process maps
and objects. Previously, "fancy" memory management techniques
such as that used by the M3 RTS would have the tendancy of chopping
up processes allocated memory into lots of little objects. Alan
has come up with some improvements to migtigate the sitution to
the point where even the M3 RTS only has one object for bss and
it's managed memory (when running CVSUP.) (There are still cases where the
situation isn't improved when the system pages -- but this is much much
better for the vast majority of cases.) The system will now be able
to much more effectively merge map entries.
Submitted by: Alan Cox <alc@cs.rice.edu>
Diffstat (limited to 'sys/vm/vm_object.c')
| -rw-r--r-- | sys/vm/vm_object.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c index 3c6ceeb..bb51ee2 100644 --- a/sys/vm/vm_object.c +++ b/sys/vm/vm_object.c @@ -61,7 +61,7 @@ * any improvements or extensions that they make and grant Carnegie the * rights to redistribute these changes. * - * $Id: vm_object.c,v 1.81 1996/09/14 11:54:57 bde Exp $ + * $Id: vm_object.c,v 1.82 1996/09/28 03:33:26 dyson Exp $ */ /* @@ -1299,13 +1299,18 @@ vm_object_coalesce(prev_object, prev_pindex, prev_size, next_size) * pages not mapped to prev_entry may be in use anyway) */ - if (prev_object->ref_count > 1 || - prev_object->backing_object != NULL) { + if (prev_object->backing_object != NULL) { return (FALSE); } prev_size >>= PAGE_SHIFT; next_size >>= PAGE_SHIFT; + + if ((prev_object->ref_count > 1) && + (prev_object->size != prev_pindex + prev_size)) { + return (FALSE); + } + /* * Remove any pages that may still be in the object from a previous * deallocation. |
