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| author | dillon <dillon@FreeBSD.org> | 2000-05-29 22:40:54 +0000 |
|---|---|---|
| committer | dillon <dillon@FreeBSD.org> | 2000-05-29 22:40:54 +0000 |
| commit | 82627e96a026e438a7251b0e5dc0a5322435693c (patch) | |
| tree | 30efad495e652bce5e17011dd662ffce150ecd07 /sys/vm/vm_object.h | |
| parent | 2e7f60e876b44bc7a2762fa018f17c30864bc19d (diff) | |
| download | FreeBSD-src-82627e96a026e438a7251b0e5dc0a5322435693c.zip FreeBSD-src-82627e96a026e438a7251b0e5dc0a5322435693c.tar.gz | |
This is a cleanup patch to Peter's new OBJT_PHYS VM object type
and sysv shared memory support for it. It implements a new
PG_UNMANAGED flag that has slightly different characteristics
from PG_FICTICIOUS.
A new sysctl, kern.ipc.shm_use_phys has been added to enable the
use of physically-backed sysv shared memory rather then swap-backed.
Physically backed shm segments are not tracked with PV entries,
allowing programs which use a large shm segment as a rendezvous
point to operate without eating an insane amount of KVM in the
PV entry management. Read: Oracle.
Peter's OBJT_PHYS object will also allow us to eventually implement
page-table sharing and/or 4MB physical page support for such segments.
We're half way there.
Diffstat (limited to 'sys/vm/vm_object.h')
| -rw-r--r-- | sys/vm/vm_object.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/vm/vm_object.h b/sys/vm/vm_object.h index 62a3bbe..c9f239c 100644 --- a/sys/vm/vm_object.h +++ b/sys/vm/vm_object.h @@ -123,6 +123,7 @@ struct vm_object { TAILQ_HEAD(, vm_page) devp_pglist; } devp; +#if 0 /* * Physmem pager * @@ -131,6 +132,7 @@ struct vm_object { struct { TAILQ_HEAD(, vm_page) physp_pglist; } physp; +#endif /* * Swap pager |
