Author: alc
Date: Sun Aug 31 17:38:41 2014
New Revision: 270883
URL: http://svnweb.freebsd.org/changeset/base/270883
Log:
Automatically prefault a limited number of mappings to resident pages in
shmat(2), just like mmap(2).
MFC after: 5 days
Sponsored by: EMC / Isilon Storage Division
Modified:
head/sys/kern/sysv_shm.c
Modified: head/sys/kern/sysv_shm.c
==============================================================================
--- head/sys/kern/sysv_shm.c Sun Aug 31 17:21:51 2014 (r270882)
+++ head/sys/kern/sysv_shm.c Sun Aug 31 17:38:41 2014 (r270883)
@@ -410,9 +410,9 @@ kern_shmat(td, shmid, shmaddr, shmflg)
}
vm_object_reference(shmseg->object);
- rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object,
- 0, &attach_va, size, 0, shmaddr != NULL ? VMFS_NO_SPACE :
- VMFS_OPTIMAL_SPACE, prot, prot, MAP_INHERIT_SHARE);
+ rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object, 0, &attach_va,
+ size, 0, shmaddr != NULL ? VMFS_NO_SPACE : VMFS_OPTIMAL_SPACE,
+ prot, prot, MAP_INHERIT_SHARE | MAP_PREFAULT_PARTIAL);
if (rv != KERN_SUCCESS) {
vm_object_deallocate(shmseg->object);
error = ENOMEM;
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