Date: Sun, 31 Aug 2014 17:38:41 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r270883 - head/sys/kern Message-ID: <201408311738.s7VHcfvn065610@svn.freebsd.org>
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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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