Author: kib Date: Thu Dec 28 13:23:13 2017 New Revision: 327286 URL: https://svnweb.freebsd.org/changeset/base/327286
Log: Reuse kern_proc_vmmap_resident() for procfs_map resident count. The existing algorithm in procfs_map() to calculate count of resident pages in an entry is too primitive, resulting in too long run time for large sparse mapping entries. Re-use the kern_proc_vmmap_resident() from kern_proc.c which only looks at the existing pages in the iterations. Also, this makes procfs to honor kern.proc_vmmap_skip_resident_count, if user does not need this information. Reported by: Glenn Weinberg <[email protected]> PR: 224532 No objections from: des (procfs maintainer) Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D13595 Modified: head/sys/fs/procfs/procfs_map.c Modified: head/sys/fs/procfs/procfs_map.c ============================================================================== --- head/sys/fs/procfs/procfs_map.c Thu Dec 28 13:16:32 2017 (r327285) +++ head/sys/fs/procfs/procfs_map.c Thu Dec 28 13:23:13 2017 (r327286) @@ -84,12 +84,17 @@ procfs_doprocmap(PFS_FILL_ARGS) vm_map_t map; vm_map_entry_t entry, tmp_entry; struct vnode *vp; - char *fullpath, *freepath; + char *fullpath, *freepath, *type; struct ucred *cred; - int error; + vm_object_t obj, tobj, lobj; + int error, privateresident, ref_count, resident, shadow_count, flags; + vm_offset_t e_start, e_end; + vm_eflags_t e_eflags; + vm_prot_t e_prot; unsigned int last_timestamp; + bool super; #ifdef COMPAT_FREEBSD32 - int wrap32 = 0; + bool wrap32; #endif PROC_LOCK(p); @@ -102,11 +107,12 @@ procfs_doprocmap(PFS_FILL_ARGS) return (EOPNOTSUPP); #ifdef COMPAT_FREEBSD32 - if (SV_CURPROC_FLAG(SV_ILP32)) { - if (!(SV_PROC_FLAG(p, SV_ILP32))) - return (EOPNOTSUPP); - wrap32 = 1; - } + wrap32 = false; + if (SV_CURPROC_FLAG(SV_ILP32)) { + if (!(SV_PROC_FLAG(p, SV_ILP32))) + return (EOPNOTSUPP); + wrap32 = true; + } #endif vm = vmspace_acquire_ref(p); @@ -116,14 +122,6 @@ procfs_doprocmap(PFS_FILL_ARGS) vm_map_lock_read(map); for (entry = map->header.next; entry != &map->header; entry = entry->next) { - vm_object_t obj, tobj, lobj; - int ref_count, shadow_count, flags; - vm_offset_t e_start, e_end, addr; - int resident, privateresident; - char *type; - vm_eflags_t e_eflags; - vm_prot_t e_prot; - if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) continue; @@ -132,6 +130,7 @@ procfs_doprocmap(PFS_FILL_ARGS) e_start = entry->start; e_end = entry->end; privateresident = 0; + resident = 0; obj = entry->object.vm_object; if (obj != NULL) { VM_OBJECT_RLOCK(obj); @@ -140,20 +139,17 @@ procfs_doprocmap(PFS_FILL_ARGS) } cred = (entry->cred) ? entry->cred : (obj ? obj->cred : NULL); - resident = 0; - addr = entry->start; - while (addr < entry->end) { - if (pmap_extract(map->pmap, addr)) - resident++; - addr += PAGE_SIZE; - } - - for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) { + for (lobj = tobj = obj; tobj != NULL; + tobj = tobj->backing_object) { if (tobj != obj) VM_OBJECT_RLOCK(tobj); - if (lobj != obj) - VM_OBJECT_RUNLOCK(lobj); lobj = tobj; + } + if (obj != NULL) + kern_proc_vmmap_resident(map, entry, &resident, &super); + for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { + if (tobj != obj && tobj != lobj) + VM_OBJECT_RUNLOCK(tobj); } last_timestamp = map->timestamp; vm_map_unlock_read(map); _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "[email protected]"
