chiark / gitweb /
unit: reduce heap usage for unit objects
authorMichal Schmidt <mschmidt@redhat.com>
Sun, 15 Jan 2012 09:53:49 +0000 (10:53 +0100)
committerMichal Schmidt <mschmidt@redhat.com>
Mon, 16 Jan 2012 12:34:42 +0000 (13:34 +0100)
The storage of the unit objects on the heap is currently not very
efficient. For every unit object we allocate a chunk of memory as large
as the biggest unit type, although there are significant differences in
the units' real requirements.
pahole shows the following sizes of structs:
488  Target
496  Snapshot
512  Device
528  Path
560  Timer
576  Automount
1080 Socket
1160 Swap
1168 Service
1280 Mount

Usually there aren't many targets or snapshots in the system, but Device
is one of the most common unit types and for every one we waste
1280 - 512 = 768 bytes.

Fix it by allocating only the right amount for the given unit type.
On my machine (x86_64, with 39 LVM volumes) this decreases systemd's
USS (unique set size) by more than 300 KB.

13 files changed:
src/automount.c
src/device.c
src/manager.c
src/mount.c
src/path.c
src/service.c
src/snapshot.c
src/socket.c
src/swap.c
src/target.c
src/timer.c
src/unit.c
src/unit.h

index b70f8b4..c4191f6 100644 (file)
@@ -836,6 +836,7 @@ DEFINE_STRING_TABLE_LOOKUP(automount_state, AutomountState);
 
 const UnitVTable automount_vtable = {
         .suffix = ".automount",
+        .object_size = sizeof(Automount),
         .sections =
                 "Unit\0"
                 "Automount\0"
index bffeca0..64665a8 100644 (file)
@@ -198,10 +198,12 @@ static int device_update_unit(Manager *m, struct udev_device *dev, const char *p
         if (!u) {
                 delete = true;
 
-                if (!(u = unit_new(m)))
+                u = unit_new(m, sizeof(Device));
+                if (!u)
                         return -ENOMEM;
 
-                if ((r = device_add_escaped_name(u, path)) < 0)
+                r = device_add_escaped_name(u, path);
+                if (r < 0)
                         goto fail;
 
                 unit_add_to_load_queue(u);
@@ -583,6 +585,7 @@ DEFINE_STRING_TABLE_LOOKUP(device_state, DeviceState);
 
 const UnitVTable device_vtable = {
         .suffix = ".device",
+        .object_size = sizeof(Device),
         .sections =
                 "Unit\0"
                 "Device\0"
index a549209..6831973 100644 (file)
@@ -1795,6 +1795,7 @@ unsigned manager_dispatch_load_queue(Manager *m) {
 
 int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DBusError *e, Unit **_ret) {
         Unit *ret;
+        UnitType t;
         int r;
 
         assert(m);
@@ -1811,24 +1812,30 @@ int manager_load_unit_prepare(Manager *m, const char *name, const char *path, DB
         if (!name)
                 name = file_name_from_path(path);
 
-        if (!unit_name_is_valid(name, false)) {
+        t = unit_name_to_type(name);
+
+        if (t == _UNIT_TYPE_INVALID || !unit_name_is_valid_no_type(name, false)) {
                 dbus_set_error(e, BUS_ERROR_INVALID_NAME, "Unit name %s is not valid.", name);
                 return -EINVAL;
         }
 
-        if ((ret = manager_get_unit(m, name))) {
+        ret = manager_get_unit(m, name);
+        if (ret) {
                 *_ret = ret;
                 return 1;
         }
 
-        if (!(ret = unit_new(m)))
+        ret = unit_new(m, unit_vtable[t]->object_size);
+        if (!ret)
                 return -ENOMEM;
 
-        if (path)
-                if (!(ret->meta.fragment_path = strdup(path))) {
+        if (path) {
+                ret->meta.fragment_path = strdup(path);
+                if (!ret->meta.fragment_path) {
                         unit_free(ret);
                         return -ENOMEM;
                 }
+        }
 
         if ((r = unit_add_name(ret, name)) < 0) {
                 unit_free(ret);
index 12c0710..f94c0eb 100644 (file)
@@ -1395,13 +1395,16 @@ static int mount_add_one(
         if (!is_path(where))
                 return 0;
 
-        if (!(e = unit_name_from_path(where, ".mount")))
+        e = unit_name_from_path(where, ".mount");
+        if (!e)
                 return -ENOMEM;
 
-        if (!(u = manager_get_unit(m, e))) {
+        u = manager_get_unit(m, e);
+        if (!u) {
                 delete = true;
 
-                if (!(u = unit_new(m))) {
+                u = unit_new(m, sizeof(Mount));
+                if (!u) {
                         free(e);
                         return -ENOMEM;
                 }
@@ -1412,7 +1415,8 @@ static int mount_add_one(
                 if (r < 0)
                         goto fail;
 
-                if (!(MOUNT(u)->where = strdup(where))) {
+                MOUNT(u)->where = strdup(where);
+                if (!MOUNT(u)->where) {
                         r = -ENOMEM;
                         goto fail;
                 }
@@ -1837,6 +1841,7 @@ DEFINE_STRING_TABLE_LOOKUP(mount_exec_command, MountExecCommand);
 
 const UnitVTable mount_vtable = {
         .suffix = ".mount",
+        .object_size = sizeof(Mount),
         .sections =
                 "Unit\0"
                 "Mount\0"
index 957af05..ae5052a 100644 (file)
@@ -717,6 +717,7 @@ DEFINE_STRING_TABLE_LOOKUP(path_type, PathType);
 
 const UnitVTable path_vtable = {
         .suffix = ".path",
+        .object_size = sizeof(Path),
         .sections =
                 "Unit\0"
                 "Path\0"
index 113be34..6ce6b19 100644 (file)
@@ -3553,6 +3553,7 @@ DEFINE_STRING_TABLE_LOOKUP(notify_access, NotifyAccess);
 
 const UnitVTable service_vtable = {
         .suffix = ".service",
+        .object_size = sizeof(Service),
         .sections =
                 "Unit\0"
                 "Service\0"
index 270dc4f..161629d 100644 (file)
@@ -282,6 +282,7 @@ DEFINE_STRING_TABLE_LOOKUP(snapshot_state, SnapshotState);
 
 const UnitVTable snapshot_vtable = {
         .suffix = ".snapshot",
+        .object_size = sizeof(Snapshot),
 
         .no_alias = true,
         .no_instances = true,
index 7034436..1a245aa 100644 (file)
@@ -2114,6 +2114,7 @@ DEFINE_STRING_TABLE_LOOKUP(socket_exec_command, SocketExecCommand);
 
 const UnitVTable socket_vtable = {
         .suffix = ".socket",
+        .object_size = sizeof(Socket),
         .sections =
                 "Unit\0"
                 "Socket\0"
index 4fa30a3..202c4e6 100644 (file)
@@ -334,7 +334,8 @@ int swap_add_one(
         assert(m);
         assert(what);
 
-        if (!(e = unit_name_from_path(what, ".swap")))
+        e = unit_name_from_path(what, ".swap");
+        if (!e)
                 return -ENOMEM;
 
         u = manager_get_unit(m, e);
@@ -348,15 +349,18 @@ int swap_add_one(
         if (!u) {
                 delete = true;
 
-                if (!(u = unit_new(m))) {
+                u = unit_new(m, sizeof(Swap));
+                if (!u) {
                         free(e);
                         return -ENOMEM;
                 }
 
-                if ((r = unit_add_name(u, e)) < 0)
+                r = unit_add_name(u, e);
+                if (r < 0)
                         goto fail;
 
-                if (!(SWAP(u)->what = strdup(what))) {
+                SWAP(u)->what = strdup(what);
+                if (!SWAP(u)->what) {
                         r = -ENOMEM;
                         goto fail;
                 }
@@ -1341,6 +1345,7 @@ DEFINE_STRING_TABLE_LOOKUP(swap_exec_command, SwapExecCommand);
 
 const UnitVTable swap_vtable = {
         .suffix = ".swap",
+        .object_size = sizeof(Swap),
         .sections =
                 "Unit\0"
                 "Swap\0"
index 340e990..b774cfb 100644 (file)
@@ -199,6 +199,7 @@ DEFINE_STRING_TABLE_LOOKUP(target_state, TargetState);
 
 const UnitVTable target_vtable = {
         .suffix = ".target",
+        .object_size = sizeof(Target),
         .sections =
                 "Unit\0"
                 "Target\0"
index d127a11..87adb29 100644 (file)
@@ -468,6 +468,7 @@ DEFINE_STRING_TABLE_LOOKUP(timer_base, TimerBase);
 
 const UnitVTable timer_vtable = {
         .suffix = ".timer",
+        .object_size = sizeof(Timer),
         .sections =
                 "Unit\0"
                 "Timer\0"
index 1fbfb1d..fa3c264 100644 (file)
@@ -57,15 +57,18 @@ const UnitVTable * const unit_vtable[_UNIT_TYPE_MAX] = {
         [UNIT_PATH] = &path_vtable
 };
 
-Unit *unit_new(Manager *m) {
+Unit *unit_new(Manager *m, size_t size) {
         Unit *u;
 
         assert(m);
+        assert(size >= sizeof(Meta));
 
-        if (!(u = new0(Unit, 1)))
+        u = malloc0(size);
+        if (!u)
                 return NULL;
 
-        if (!(u->meta.names = set_new(string_hash_func, string_compare_func))) {
+        u->meta.names = set_new(string_hash_func, string_compare_func);
+        if (!u->meta.names) {
                 free(u);
                 return NULL;
         }
index 19314d6..626bdc4 100644 (file)
@@ -286,6 +286,9 @@ union Unit {
 struct UnitVTable {
         const char *suffix;
 
+        /* How much memory does an object of this unit type need */
+        size_t object_size;
+
         /* Config file sections this unit type understands, separated
          * by NUL chars */
         const char *sections;
@@ -435,7 +438,7 @@ DEFINE_CAST(SNAPSHOT, Snapshot);
 DEFINE_CAST(SWAP, Swap);
 DEFINE_CAST(PATH, Path);
 
-Unit *unit_new(Manager *m);
+Unit *unit_new(Manager *m, size_t size);
 void unit_free(Unit *u);
 
 int unit_add_name(Unit *u, const char *name);