Date: Mon, 11 Mar 2013 15:48:17 +0000 (UTC) From: Attilio Rao <attilio@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r248166 - user/attilio/vmobj-readlock/sys/kern Message-ID: <201303111548.r2BFmHKV092526@svn.freebsd.org>
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Author: attilio Date: Mon Mar 11 15:48:17 2013 New Revision: 248166 URL: http://svnweb.freebsd.org/changeset/base/248166 Log: Fix low-hanging fruit read lock for vm objects. Sponsored by: EMC / Isilon storage division Modified: user/attilio/vmobj-readlock/sys/kern/imgact_elf.c user/attilio/vmobj-readlock/sys/kern/kern_proc.c user/attilio/vmobj-readlock/sys/kern/sys_process.c Modified: user/attilio/vmobj-readlock/sys/kern/imgact_elf.c ============================================================================== --- user/attilio/vmobj-readlock/sys/kern/imgact_elf.c Mon Mar 11 14:50:45 2013 (r248165) +++ user/attilio/vmobj-readlock/sys/kern/imgact_elf.c Mon Mar 11 15:48:17 2013 (r248166) @@ -1278,15 +1278,15 @@ each_writable_segment(td, func, closure) continue; /* Ignore memory-mapped devices and such things. */ - VM_OBJECT_WLOCK(object); + VM_OBJECT_RLOCK(object); while ((backing_object = object->backing_object) != NULL) { - VM_OBJECT_WLOCK(backing_object); - VM_OBJECT_WUNLOCK(object); + VM_OBJECT_RLOCK(backing_object); + VM_OBJECT_RUNLOCK(object); object = backing_object; } ignore_entry = object->type != OBJT_DEFAULT && object->type != OBJT_SWAP && object->type != OBJT_VNODE; - VM_OBJECT_WUNLOCK(object); + VM_OBJECT_RUNLOCK(object); if (ignore_entry) continue; Modified: user/attilio/vmobj-readlock/sys/kern/kern_proc.c ============================================================================== --- user/attilio/vmobj-readlock/sys/kern/kern_proc.c Mon Mar 11 14:50:45 2013 (r248165) +++ user/attilio/vmobj-readlock/sys/kern/kern_proc.c Mon Mar 11 15:48:17 2013 (r248166) @@ -1995,7 +1995,7 @@ sysctl_kern_proc_ovmmap(SYSCTL_HANDLER_A kve->kve_private_resident = 0; obj = entry->object.vm_object; if (obj != NULL) { - VM_OBJECT_WLOCK(obj); + VM_OBJECT_RLOCK(obj); if (obj->shadow_count == 1) kve->kve_private_resident = obj->resident_page_count; @@ -2010,9 +2010,9 @@ sysctl_kern_proc_ovmmap(SYSCTL_HANDLER_A for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) { if (tobj != obj) - VM_OBJECT_WLOCK(tobj); + VM_OBJECT_RLOCK(tobj); if (lobj != obj) - VM_OBJECT_WUNLOCK(lobj); + VM_OBJECT_RUNLOCK(lobj); lobj = tobj; } @@ -2072,11 +2072,11 @@ sysctl_kern_proc_ovmmap(SYSCTL_HANDLER_A break; } if (lobj != obj) - VM_OBJECT_WUNLOCK(lobj); + VM_OBJECT_RUNLOCK(lobj); kve->kve_ref_count = obj->ref_count; kve->kve_shadow_count = obj->shadow_count; - VM_OBJECT_WUNLOCK(obj); + VM_OBJECT_RUNLOCK(obj); if (vp != NULL) { vn_fullpath(curthread, vp, &fullpath, &freepath); @@ -2162,7 +2162,7 @@ sysctl_kern_proc_vmmap(SYSCTL_HANDLER_AR kve->kve_private_resident = 0; obj = entry->object.vm_object; if (obj != NULL) { - VM_OBJECT_WLOCK(obj); + VM_OBJECT_RLOCK(obj); if (obj->shadow_count == 1) kve->kve_private_resident = obj->resident_page_count; @@ -2183,9 +2183,9 @@ sysctl_kern_proc_vmmap(SYSCTL_HANDLER_AR for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) { if (tobj != obj) - VM_OBJECT_WLOCK(tobj); + VM_OBJECT_RLOCK(tobj); if (lobj != obj) - VM_OBJECT_WUNLOCK(lobj); + VM_OBJECT_RUNLOCK(lobj); lobj = tobj; } @@ -2247,11 +2247,11 @@ sysctl_kern_proc_vmmap(SYSCTL_HANDLER_AR break; } if (lobj != obj) - VM_OBJECT_WUNLOCK(lobj); + VM_OBJECT_RUNLOCK(lobj); kve->kve_ref_count = obj->ref_count; kve->kve_shadow_count = obj->shadow_count; - VM_OBJECT_WUNLOCK(obj); + VM_OBJECT_RUNLOCK(obj); if (vp != NULL) { vn_fullpath(curthread, vp, &fullpath, &freepath); Modified: user/attilio/vmobj-readlock/sys/kern/sys_process.c ============================================================================== --- user/attilio/vmobj-readlock/sys/kern/sys_process.c Mon Mar 11 14:50:45 2013 (r248165) +++ user/attilio/vmobj-readlock/sys/kern/sys_process.c Mon Mar 11 15:48:17 2013 (r248166) @@ -382,7 +382,7 @@ ptrace_vm_entry(struct thread *td, struc obj = entry->object.vm_object; if (obj != NULL) - VM_OBJECT_WLOCK(obj); + VM_OBJECT_RLOCK(obj); } while (0); vm_map_unlock_read(map); @@ -395,9 +395,9 @@ ptrace_vm_entry(struct thread *td, struc lobj = obj; for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { if (tobj != obj) - VM_OBJECT_WLOCK(tobj); + VM_OBJECT_RLOCK(tobj); if (lobj != obj) - VM_OBJECT_WUNLOCK(lobj); + VM_OBJECT_RUNLOCK(lobj); lobj = tobj; pve->pve_offset += tobj->backing_object_offset; } @@ -405,8 +405,8 @@ ptrace_vm_entry(struct thread *td, struc if (vp != NULL) vref(vp); if (lobj != obj) - VM_OBJECT_WUNLOCK(lobj); - VM_OBJECT_WUNLOCK(obj); + VM_OBJECT_RUNLOCK(lobj); + VM_OBJECT_RUNLOCK(obj); if (vp != NULL) { freepath = NULL;
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