一丶环境信息

源码版本：openharmony-4.1-Release
板子型号：开发者手机

二丶优化思路

在openharmony系统中，如果对性能有严格要求的话，可以尝试合并进程来优化，因为系统在运行进程时，在创建进程资源时很多前提条件是相同的，而在openharmony有一个foundation进程，它就是由很多进程合并的核心进程。foundation进程中有19个独立的进程，可以使用命令hdc shell 进入终端进行查看

# cat /system/profile/foundation.json
{
    "process": "foundation",
    "systemability": [
        {
            "name": 401,
            "libpath": "libbms.z.so",
            "run-on-create": true,
            "depend_time_out": 60000,
            "distributed": false,
            "bootphase": "CoreStartPhase",
            "dump_level": 1,
            "depend": [
                3503
            ]
        },
        {
            "name": 4606,
            "libpath": "libwms.z.so",
            "run-on-create": true,
            "distributed": false,
            "bootphase": "CoreStartPhase",
            "dump_level": 1
        },
        {
            "name": 4607,
            "libpath": "libwms.z.so",
            "run-on-create": true,
            "distributed": false,
            "bootphase": "CoreStartPhase",
            "dump_level": 1
        },
        {
            "name": 3299,
            "libpath": "libcesfwk_services.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3203,
            "libpath": "libans.z.so",
            "run-on-create": true,
            "depend": [
                3299
            ],
            "depend_time_out": 60000,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3302,
            "libpath": "libbatteryservice.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3304,
            "libpath": "libbatterystats_service.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3308,
            "libpath": "libdisplaymgrservice.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3301,
            "libpath": "libpowermgrservice.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3303,
            "libpath": "libthermalservice.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 4005,
            "libpath": "libtel_call_manager.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 4009,
            "libpath": "libtel_state_registry.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3704,
            "libpath": "libscreenlock_server.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 180,
            "libpath": "libabilityms.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 182,
            "libpath": "libdataobsms.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 183,
            "libpath": "libupms.z.so",
            "run-on-create": false,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 501,
            "libpath": "libappms.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 1404,
            "libpath": "libdistributed_ability_manager_svr.z.so",
            "run-on-create": true,
            "distributed": false
        },
        {
            "name": 403,
            "libpath": "libfms.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        }
    ]
}#

三丶操作步骤

我们今天来举个例子，把time_service这个进程合并到foundation进程中，来看看是不是占用的内存会变小：
我们使用hidumper --mem命令查看原始内存情况：

Total Pss by OOM adjustment:
System: 0 kB
Persistent: 0 kB
Foreground: 0 kB
Suspend-delay: 0 kB
Perceived: 0 kB
Background: 0 kB
Undefined: 798085 kB
   com.ohos.launcher(pid=1672): 116104 kB
   com.ohos.systemui(pid=1648): 89484 kB
   media_service(pid=797):    73642 kB
   foundation(pid=787):       44851 kB
   appspawn(pid=345):         43655 kB
   camera_host(pid=765):      24025 kB
   render_service(pid=784):   23895 kB
   com.laval.bi(pid=1637):    19822 kB
   hiview(pid=339):           18357 kB
   nnrt_host(pid=750):        17475 kB
   telephony(pid=628):        16878 kB
   cp_diskserver.bin(pid=620): 16234 kB
   resource_schedu(pid=450):  14666 kB
   com.kika.hmos.inputmethod:inputMethod(pid=1722): 13822 kB
   audio_server(pid=526):     13561 kB
   wifi_manager_se(pid=1223): 13038 kB
   multimodalinput(pid=589):  12480 kB
   msdp(pid=714):             11345 kB
   accessibility(pid=600):    11291 kB
   distributeddata(pid=782):  11077 kB
   inputmethod_ser(pid=934):  10834 kB
   softbus_server(pid=793):   9792 kB
   bluetooth_servi(pid=448):  8889 kB
   av_session(pid=775):       8427 kB
   camera_service(pid=786):   8343 kB
   bgtaskmgr_servi(pid=713):  6968 kB
   hidumper_servic(pid=7691): 6872 kB
   usb_service(pid=1346):     6523 kB
   storage_manager(pid=346):  5852 kB
   netmanager(pid=632):       5613 kB
   wallpaper_servi(pid=627):  5506 kB
   accountmgr(pid=338):       5130 kB
   wifi_hal_service(pid=1645): 4959 kB
   device_usage_st(pid=611):  4544 kB
   samgr(pid=342):            3903 kB
   useriam(pid=343):          3821 kB
   huks_service(pid=552):     3726 kB
   memmgrservice(pid=461):    3637 kB
   accesstoken_ser(pid=344):  3554 kB
   hilogd(pid=318):           3517 kB
   riladapter_host(pid=763):  3310 kB
   asset_service(pid=565):    3162 kB
   nwebspawn(pid=551):        3116 kB
   audio_host(pid=766):       3056 kB
   storage_daemon(pid=340):   2917 kB
   composer_host(pid=774):    2828 kB
   deviceauth_service(pid=460): 2779 kB
   sensors(pid=792):          2739 kB
   av_codec_servic(pid=794):  2627 kB
   device_manager(pid=341):   2503 kB
   netsysnative(pid=808):     2489 kB
   time_service(pid=712):     2335 kB
   ecologicalRuleM(pid=791):  2209 kB
   pinauth(pid=1303):         2094 kB
   privacy_service(pid=935):  2070 kB
   power_host(pid=770):       2061 kB
   pin_auth_host(pid=754):    2027 kB
   user_auth_host(pid=753):   2020 kB
   ui_service(pid=796):       1874 kB
   drm_service(pid=789):      1840 kB
   hdcd(pid=1057):            1652 kB
   concurrent_task(pid=497):  1595 kB
   param_watcher(pid=347):    1485 kB
   hidumper(pid=7688):        1480 kB
   allocator_host(pid=773):   1465 kB
   init(pid=1):               1454 kB
   usb_host(pid=771):         1427 kB
   codec_host(pid=758):       1208 kB
   face_auth_host(pid=756):   934 kB
   sensor_host(pid=762):      902 kB
   wifi_host(pid=767):        890 kB
   fingerprint_auth_host(pid=752): 863 kB
   vibrator_host(pid=760):    838 kB
   hdf_devmgr(pid=337):       835 kB
   light_host(pid=759):       777 kB
   blue_host(pid=772):        774 kB
   uinput_inject(pid=586):    658 kB
   sh(pid=7549):              658 kB
   modem_control.bin(pid=618): 584 kB
   input_user_host(pid=764):  555 kB
   wifi_hal_service(pid=358): 524 kB
   faultloggerd(pid=785):     359 kB

Total Pss by Category:
File-backed Page(471507 kB):
       396888 kB : .so
        53071 kB : dev
        13720 kB : other
         7508 kB : .ttf
          320 kB : .db
            0 kB : dmabuf
Anonymous Page(318223 kB):
       253220 kB : native heap
        29663 kB : ark ts heap
        24348 kB : other
        10992 kB : stack
            0 kB : guard
GPU(0 kB):
            0 kB : GL
Graph(0 kB):
            0 kB : Graph
DMA(0 kB):
            0 kB : Dma

      Total RAM:7502432 kB
       Free RAM:5930136 kB (429144 cached + 5500992 free)
       Used RAM:1358426 kB (789730 total pss + 568696 kernel)
       Lost RAM:213870 kB

Total RAM by Category:
 Hardware Usage:999488 kB
      CMA Usage:7458 kB
   Kernel Usage:533384 kB
Processes Usage:789730 kB

Total Purgeable:
  Total PurgSum:1096763301776 kB
  Total PurgPin:548381650888 kB

可以看到 foundation(pid=787): 44851 kB 和 time_service(pid=712): 2335 kB 。
接下来我们来合并。
第一步：
我们先把对应的配置文件导出来：

hdc_std file recv /system/etc/init/foundation.cfg ./
hdc_std file recv /system/profile/foundation.json ./
hdc_std file recv /system/profile/foundation_trust.json ./
hdc_std file recv /system/etc/init/timeservice.cfg ./
hdc_std file recv /system/profile/time_service.json ./

合并主要是SA服务的cfg和json配置文件的合并。我们参考其他的SA服务在foundation进程一样的写法，把timeservice服务加入foundation进程的配置文件中，首先将timeservice的cfg文件进行合并，timeservice服务的cfg配置也就只有jobs和service。job阶段是服务启动的一些前提条件，这个必须要合并到foundation.cfg中的jobs字段，然后services字段选择性合并，一般只关注permission和uid字段。（如果当前自己的服务在service有特殊的字段，也可以加入foundation.cfg的service字段中）如果foundation的permission字段包含了timeservice的permission，那么就只需要添加gid字段了。如果不太清楚做了哪些修改，也可以拿修改后的对比一下修改前的，这样修改点就很明了。参考如下：
foundation.cfg修改如下：

{
    "jobs" : [{
            "name" : "services:foundation",
            "cmds" : [
                "mkdir /data/service/el1/public/AbilityManagerService 0711 foundation system",
                "mkdir /data/storage/el1/bundle 0711 system system",
                "mkdir /data/storage/el2/base 0711 system system",
                "mkdir /data/storage/el2/database 0711 system system",
                "mkdir /data/service/el1/public/notification 0711 foundation system",
                "mkdir /data/service/el1/public/database 0711 ddms ddms",
                "mkdir /data/service/el1/public/database/bundle_manager_service 02770 foundation ddms",
                "mkdir /data/service/el1/public/database/notification_service 02770 foundation ddms",
                "mkdir /data/service/el1/public/database/form_storage 02770 foundation ddms",
                "mkdir /data/service/el0/stats 0711 foundation system",
                "mkdir /data/service/el0/thermal 0755 foundation foundation",
                "mkdir /data/service/el0/thermal/config 0711 foundation foundation",
                "chmod 0664 /sys/power/wakeup_count",
                "mkdir /data/service/el1/public/window 0711 foundation foundation",
                "mkdir /data/service/el1/public/database/common_event_service 02770 foundation ddms",
                "mkdir /data/service/el1/public/database/auto_startup_service 02770 foundation ddms",
                "mkdir /data/service/el1/public/database/app_exit_reason 02770 foundation ddms"
            ]
        } , {
            "name" : "services:restartfoundation",
            "cmds" : [
                "reset appspawn",
                "reset accountmgr",
                "reset bgtaskmgr_service",
                "reset resource_schedule_service",
                "reset device_usage_stats_service",
                "stop dlp_permission_service",
                "start bootanimation"
            ]
        } , {
                "name" : "boot",
                "cmds" : [
                    "mkdir /data/service/el1/public/time 0770 time time",
                    "syncexec /system/bin/chown -R time:time /data/service/el1/public/time",
                    "start time_service"
                ]
        }
    ],
    "services" : [{
            "name" : "foundation",
            "path" : ["/system/bin/sa_main", "/system/profile/foundation.json"],
            "critical" : [1, 4, 240],
            "importance" : -20,
            "uid" : "foundation",
            "permission" : [
                "ohos.permission.INPUT_MONITORING",
                "ohos.permission.PERMISSION_USED_STATS",
                "ohos.permission.DISTRIBUTED_SOFTBUS_CENTER",
                "ohos.permission.DISTRIBUTED_DATASYNC",
                "ohos.permission.MANAGE_AUDIO_CONFIG",
                "ohos.permission.WRITE_CALL_LOG",
                "ohos.permission.READ_CONTACTS",
                "ohos.permission.READ_DFX_SYSEVENT",
                "ohos.permission.GRANT_SENSITIVE_PERMISSIONS",
                "ohos.permission.REVOKE_SENSITIVE_PERMISSIONS",
                "ohos.permission.MANAGE_SECURE_SETTINGS",
                "ohos.permission.START_ABILITIES_FROM_BACKGROUND",
                "ohos.permission.ACCESS_SERVICE_DM",
                "ohos.permission.STORAGE_MANAGER",
                "ohos.permission.PROXY_AUTHORIZATION_URI",
                "ohos.permission.ABILITY_BACKGROUND_COMMUNICATION",
                "ohos.permission.USE_USER_IDM",
                "ohos.permission.MANAGE_LOCAL_ACCOUNTS",
                "ohos.permission.LISTEN_BUNDLE_CHANGE",
                "ohos.permission.GET_TELEPHONY_STATE",
                "ohos.permission.SEND_MESSAGES",
                "ohos.permission.CONNECT_CELLULAR_CALL_SERVICE",
                "ohos.permission.SET_TELEPHONY_STATE",
                "ohos.permission.VIBRATE",
                "ohos.permission.SYSTEM_LIGHT_CONTROL",
                "ohos.permission.MANAGE_HAP_TOKENID",
                "ohos.permission.WRITE_WHOLE_CALENDAR",
                "ohos.permission.UPDATE_CONFIGURATION",
                "ohos.permission.REPORT_RESOURCE_SCHEDULE_EVENT",
                "ohos.permission.START_INVISIBLE_ABILITY",
                "ohos.permission.GET_BUNDLE_INFO",
                "ohos.permission.GET_SUSPEND_STATE",
                "ohos.permission.PUBLISH_SYSTEM_COMMON_EVENT",
                "ohos.permission.GET_BUNDLE_INFO_PRIVILEGED",
                "ohos.permission.GET_SENSITIVE_PERMISSIONS",
                "ohos.permission.CLEAN_APPLICATION_DATA",
                "ohos.permission.REMOVE_CACHE_FILES",
                "ohos.permission.INSTALL_SANDBOX_BUNDLE",
                "ohos.permission.USE_BLUETOOTH",
                "ohos.permission.CONNECTIVITY_INTERNAL",
                "ohos.permission.GET_RUNNING_INFO",
                "ohos.permission.INTERACT_ACROSS_LOCAL_ACCOUNTS",
                "ohos.permission.ACCESS_BLUETOOTH",
                "ohos.permission.RUNNING_STATE_OBSERVER"
            ],
            "permission_acls":[
                "ohos.permission.MANAGE_HAP_TOKENID",
                "ohos.permission.GRANT_SENSITIVE_PERMISSIONS",
                "ohos.permission.INPUT_MONITORING",
                "ohos.permission.REVOKE_SENSITIVE_PERMISSIONS",
                "ohos.permission.START_INVISIBLE_ABILITY",
                "ohos.permission.INSTALL_SANDBOX_BUNDLE",
                "ohos.permission.GET_NETWORK_INFO"
            ],
            "gid" : ["system", "appspawn", "update", "time", "shell", "netsys_socket"],
            "caps" : ["SYS_PTRACE", "KILL"],
            "bootevents": [
                "bootevent.appfwk.ready"
            ],
            "jobs" : {
                "on-start" : "services:foundation",
                "on-restart" : "services:restartfoundation"
            },
            "secon" : "u:r:foundation:s0",
            "start-mode" : "boot"
        } 
        
    ]
}

接下来，修改foundation.json文件，直接将timeservice.json文件的 "systemability"字段内容加入foundation.json中。参考如下

{
    "process": "foundation",
    "systemability": [
        {
            "name": 401,
            "libpath": "libbms.z.so",
            "run-on-create": true,
            "depend_time_out": 60000,
            "distributed": false,
            "bootphase": "CoreStartPhase",
            "dump_level": 1,
            "depend": [
                3503
            ]
        },
        {
            "name": 4606,
            "libpath": "libwms.z.so",
            "run-on-create": true,
            "distributed": false,
            "bootphase": "CoreStartPhase",
            "dump_level": 1
        },
        {
            "name": 4607,
            "libpath": "libwms.z.so",
            "run-on-create": true,
            "distributed": false,
            "bootphase": "CoreStartPhase",
            "dump_level": 1
        },
        {
            "name": 3299,
            "libpath": "libcesfwk_services.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3203,
            "libpath": "libans.z.so",
            "run-on-create": true,
            "depend": [
                3299
            ],
            "depend_time_out": 60000,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3302,
            "libpath": "libbatteryservice.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3304,
            "libpath": "libbatterystats_service.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3308,
            "libpath": "libdisplaymgrservice.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3301,
            "libpath": "libpowermgrservice.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3303,
            "libpath": "libthermalservice.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 4005,
            "libpath": "libtel_call_manager.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 4009,
            "libpath": "libtel_state_registry.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3704,
            "libpath": "libscreenlock_server.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 180,
            "libpath": "libabilityms.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 182,
            "libpath": "libdataobsms.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 183,
            "libpath": "libupms.z.so",
            "run-on-create": false,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 501,
            "libpath": "libappms.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 1404,
            "libpath": "libdistributed_ability_manager_svr.z.so",
            "run-on-create": true,
            "distributed": false
        },
        {
            "name": 403,
            "libpath": "libfms.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        },
        {
            "name": 3702,
            "libpath": "libtime_system_ability.z.so",
            "run-on-create": true,
            "distributed": false,
            "dump_level": 1
        }
    ]
}

接下来继续修改foundation_trust.json，需要将timeservice.json的name字段，加入foundation_trust.json中的said

{
    "process": "foundation",
    "said": [
        180,
        182,
        183,
        401,
        403,
        501,
        1404,
        3203,
        3299,
        3301,
        3302,
        3303,
        3304,
        3308,
        3501,
        3704,
        4005,
        4009,
        4606,
        4607,
        3702
    ]
}

这样配置文件就修改好了：
在把修改好的foundation配置文件推进去

hdc_std shell mount -o remount,rw /
hdc_std file send ./foundation.cfg /system/etc/init/
hdc_std file send ./foundation.json /system/profile/
hdc_std file send ./foundation_trust.json /system/profile/

然后删除timeservice的配置文件：

rm -rf /system/etc/init/timeservice.cfg
rm -rf /system/profile/time_service.json

Total Pss by OOM adjustment:
System: 0 kB
Persistent: 0 kB
Foreground: 0 kB
Suspend-delay: 0 kB
Perceived: 0 kB
Background: 0 kB
Undefined: 819127 kB
   com.ohos.launcher(pid=1634): 115222 kB
   com.ohos.systemui(pid=1649): 84457 kB
   media_service(pid=871):    73564 kB
   foundation(pid=791):       44967 kB
   appspawn(pid=351):         40593 kB
   camera_host(pid=768):      24003 kB
   render_service(pid=786):   23730 kB
   nnrt_host(pid=734):        17470 kB
   telephony(pid=638):        16697 kB
   cp_diskserver.bin(pid=588): 16230 kB
   com.laval.bi(pid=1581):    15461 kB
   resource_schedu(pid=448):  14425 kB
   com.ohos.settingsdata(pid=1641): 14332 kB
   audio_server(pid=537):     13192 kB
   com.kika.hmos.inputmethod:inputMethod(pid=1676): 12603 kB
   multimodalinput(pid=573):  12328 kB
   hiview(pid=342):           12058 kB
   msdp(pid=713):             11196 kB
   accessibility(pid=578):    11113 kB
   cloudfileservic(pid=1935): 11010 kB
   wifi_manager_se(pid=1248): 10835 kB
   inputmethod_ser(pid=884):  10702 kB
   distributeddata(pid=784):  9885 kB
   softbus_server(pid=836):   8889 kB
   bluetooth_servi(pid=447):  8841 kB
   camera_service(pid=789):   8261 kB
   av_session(pid=783):       8259 kB
   bgtaskmgr_servi(pid=702):  6875 kB
   hidumper_servic(pid=2014): 6798 kB
   updater_sa(pid=720):       6780 kB
   usb_service(pid=1226):     6418 kB
   storage_manager(pid=352):  5548 kB
   deviceprofile(pid=1983):   5465 kB
   netmanager(pid=654):       5441 kB
   wallpaper_servi(pid=624):  5437 kB
   accountmgr(pid=341):       4925 kB
   wifi_hal_service(pid=1760): 4835 kB
   locationhub(pid=1909):     4770 kB
   device_usage_st(pid=582):  4389 kB
   dlp_permission_(pid=1776): 3856 kB
   useriam(pid=349):          3791 kB
   huks_service(pid=540):     3675 kB
   samgr(pid=348):            3640 kB
   memmgrservice(pid=471):    3582 kB
   accesstoken_ser(pid=350):  3541 kB
   riladapter_host(pid=764):  3304 kB
   asset_service(pid=550):    3098 kB
   audio_host(pid=772):       3048 kB
   installs(pid=1305):        2984 kB
   hilogd(pid=321):           2923 kB
   storage_daemon(pid=343):   2905 kB
   nwebspawn(pid=571):        2826 kB
   deviceauth_service(pid=460): 2720 kB
   sensors(pid=814):          2711 kB
   composer_host(pid=782):    2701 kB
   device_manager(pid=347):   2651 kB
   av_codec_servic(pid=841):  2610 kB
   netsysnative(pid=872):     2434 kB
   ecologicalRuleM(pid=813):  2175 kB
   pinauth(pid=1052):         2075 kB
   privacy_service(pid=887):  2056 kB
   power_host(pid=775):       2040 kB
   local_code_sign(pid=639):  2033 kB
   pin_auth_host(pid=737):    1998 kB
   user_auth_host(pid=736):   1988 kB
   ui_service(pid=854):       1853 kB
   drm_service(pid=796):      1834 kB
   hdcd(pid=892):             1656 kB
   concurrent_task(pid=498):  1577 kB
   allocator_host(pid=781):   1498 kB
   hidumper(pid=2011):        1473 kB
   deviceinfoservi(pid=1826): 1464 kB
   param_watcher(pid=353):    1460 kB
   usb_host(pid=777):         1397 kB
   codec_host(pid=740):       1204 kB
   init(pid=1):               963 kB
   face_auth_host(pid=739):   928 kB
   init(pid=307):             906 kB
   sensor_host(pid=762):      891 kB
   wifi_host(pid=773):        884 kB
   fingerprint_auth_host(pid=735): 858 kB
   hdf_devmgr(pid=340):       832 kB
   vibrator_host(pid=743):    829 kB
   light_host(pid=742):       773 kB
   blue_host(pid=779):        766 kB
   uinput_inject(pid=572):    652 kB
   sh(pid=1980):              649 kB
   modem_control.bin(pid=586): 576 kB
   input_user_host(pid=766):  547 kB
   wifi_hal_service(pid=354): 529 kB
   ueventd(pid=296):          405 kB
   faultloggerd(pid=787):     354 kB

Total Pss by Category:
File-backed Page(494569 kB):
       419851 kB : .so
        52918 kB : dev
        13880 kB : other
         7376 kB : .ttf
          544 kB : .db
            0 kB : dmabuf
Anonymous Page(321777 kB):
       254919 kB : native heap
        27469 kB : ark ts heap
        27185 kB : other
        12204 kB : stack
            0 kB : guard
GPU(0 kB):
            0 kB : GL
Graph(0 kB):
            0 kB : Graph
DMA(0 kB):
            0 kB : Dma

      Total RAM:7502432 kB
       Free RAM:6058676 kB (358900 cached + 5699776 free)
       Used RAM:1170030 kB (816346 total pss + 353684 kernel)
       Lost RAM:273726 kB

Total RAM by Category:
 Hardware Usage:999488 kB
      CMA Usage:7458 kB
   Kernel Usage:317064 kB
Processes Usage:816346 kB

Total Purgeable:
  Total PurgSum:1097253658384 kB
  Total PurgPin:548626829192 kB

这样 foundation(pid=791): 44967 kB 增加了，但是整体的内存减少了。
##五丶注意事项
成功将timeservice合入了foundation进程后，由于timeservice服务的uid和pid都已经变化了，如果部分代码在获取uid的时候，可能会获取不到。

四丶添加编译参数

参考base/inputmethod/imf/interfaces/inner_api/inputmethod_controller/BUILD.gn：

  cflags = [
    "-fdata-sections",
    "-ffunction-sections",
    "-fvisibility=hidden",
    "-Os",
  ]

cflags 和cflags_cc 的区别是，cflags对C代码和C++代码都有效，cflags_cc只对C++的代码生效，如果cflags_cc和cflags编译参数有冲突，按cflags_cc的生效