[Magisk] wzhy:
After upgrade from v14.0 to v15.0, Magisk cost lots of battery life.

I saw there are lots of "mount fail" in magisk's logcat.

07-01 16:17:22.351 509 509 I Magisk : * Creating /sbin overlay
07-01 16:17:22.352 509 509 E Magisk : mount (null)->/ failed with 16: Device or resource busy
07-01 16:17:22.352 509 509 I Magisk : * Mounting mirrors
07-01 16:17:22.352 509 509 I Magisk : mount: /sbin/.core/mirror/system
07-01 16:17:22.352 509 509 I Magisk : link: /sbin/.core/mirror/vendor
07-01 16:17:22.352 509 509 I Magisk : bind_mount: /sbin/.core/mirror/bin
07-01 16:17:22.352 509 509 I Magisk : * Setting up internal busybox
07-01 16:17:22.364 509 509 I Magisk : Magisk v15.0(1500) daemon started
07-01 16:17:22.366 509 517 I Magisk : ** post-fs mode running
07-01 16:17:23.122 509 536 I Magisk : ** post-fs-data mode running
07-02 01:17:23.122 509 536 I Magisk : * Mounting /data/adb/magisk.img
07-02 01:17:23.201 509 536 I Magisk : * Running post-fs-data.d scripts
07-02 01:17:23.202 509 536 I Magisk : * Running module post-fs-data scripts
07-02 01:17:23.202 509 536 I Magisk : privileged-api-booter: exec [post-fs-data.sh]
07-02 01:17:23.660 509 536 I Magisk : * Loading modules
07-02 01:17:23.660 509 536 I Magisk : nano-ndk: constructing magic mount structure
07-02 01:17:23.660 509 536 I Magisk : privileged-api-booter: loading [system.prop]
07-02 01:17:23.664 509 536 I Magisk : busybox-ndk: constructing magic mount structure
......
......
......
07-02 01:17:23.734 509 552 I Magisk : * Starting MagiskHide
07-02 01:17:23.734 509 552 I Magisk : hide_utils: Hiding sensitive props
07-02 01:17:23.735 509 552 I Magisk : hide_list: [com.google.android.gms.unstable]
07-02 01:17:23.829 509 552 I Magisk : proc_monitor: init ns=mnt:[4026531840]
07-02 01:17:26.534 509 955 I Magisk : ** late_start service mode running
12-26 16:50:41.037 509 552 I Magisk : proc_monitor: zygote ns=mnt:[4026534243] zygote64 ns=mnt:[4026534242]
12-26 16:51:49.373 509 552 I Magisk : proc_monitor: com.google.android.gms.unstable (PID=4200 ns=mnt:[4026534291])
12-26 16:51:49.374 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 16:51:59.419 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 16:52:19.626 509 552 I Magisk : proc_monitor: com.google.android.gms.unstable (PID=6829 ns=mnt:[4026534422])
12-26 16:52:19.626 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 16:52:29.647 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 16:52:39.661 509 552 I Magisk : proc_monitor: com.google.android.gms.unstable (PID=7864 ns=mnt:[4026534422])
12-26 16:52:39.661 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 16:52:39.896 509 552 I Magisk : proc_monitor: com.google.android.gms.unstable (PID=7882 ns=mnt:[4026534423])
12-26 16:52:39.896 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 16:52:49.910 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 16:54:07.339 509 552 I Magisk : proc_monitor: com.google.android.gms.unstable (PID=8801 ns=mnt:[4026534286])
12-26 16:54:07.339 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 16:54:17.352 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:04:20.175 509 552 I Magisk : proc_monitor: com.google.android.gms.unstable (PID=10225 ns=mnt:[4026534438])
12-26 17:04:20.177 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:04:30.190 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:08:23.093 509 10502 I Magisk : hide_list add: [com.google.android.sambadocumentsprovider]
12-26 17:08:24.096 509 10505 I Magisk : hide_list add: [com.google.android.ext.services]
12-26 17:08:24.451 509 10508 I Magisk : hide_list add: [com.google.android.ext.shared]
12-26 17:08:25.176 509 552 I Magisk : proc_monitor: com.google.android.ext.services (PID=10509 ns=mnt:[4026534303])
12-26 17:08:25.176 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:08:25.288 509 10525 I Magisk : hide_list add: [com.google.android.wearable.app]
12-26 17:08:25.605 509 10527 I Magisk : hide_list add: [com.google.android.configupdater]
12-26 17:08:25.932 509 10529 I Magisk : hide_list add: [com.google.android.apps.nbu.files]
12-26 17:08:27.017 509 10531 I Magisk : hide_list add: [com.sonymobile.googleanalyticsproxy]
12-26 17:08:27.105 509 552 I Magisk : proc_monitor: com.sonymobile.googleanalyticsproxy (PID=10532 ns=mnt:[4026534337])
12-26 17:08:27.106 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:08:27.377 509 10552 I Magisk : hide_list add: [com.google.android.inputmethod.latin]
12-26 17:08:27.712 509 10554 I Magisk : hide_list add: [com.google.android.googlequicksearchbox]
12-26 17:08:28.708 509 10556 I Magisk : hide_list add: [com.google.android.onetimeinitializer]
12-26 17:08:29.042 509 10560 I Magisk : hide_list add: [com.google.android.apps.paidtasks]
12-26 17:08:29.396 509 10562 I Magisk : hide_list add: [com.android.vending]
12-26 17:08:29.837 509 10564 I Magisk : hide_list add: [com.google.android.play.games]
12-26 17:08:30.836 509 10566 I Magisk : hide_list add: [com.sonymobile.music.googlelyricsplugin]
12-26 17:08:31.421 509 10568 I Magisk : hide_list rm: [com.sonymobile.music.googlelyricsplugin]
12-26 17:08:31.752 509 10570 I Magisk : hide_list add: [com.google.android.partnersetup]
12-26 17:08:32.095 509 10572 I Magisk : hide_list add: [com.google.android.backuptransport]
12-26 17:08:33.070 509 10574 I Magisk : hide_list add: [com.google.android.gsf.login]
12-26 17:08:33.387 509 10576 I Magisk : hide_list add: [com.google.android.tts]
12-26 17:08:33.718 509 10578 I Magisk : hide_list add: [com.google.android.gsf]
12-26 17:08:34.723 509 10581 I Magisk : hide_list add: [com.google.android.syncadapters.contacts]
12-26 17:08:35.015 509 10583 I Magisk : hide_list add: [com.google.android.keep]
12-26 17:08:35.328 509 10585 I Magisk : hide_list add: [com.google.android.printservice.recommendation]
12-26 17:08:35.639 509 10587 I Magisk : hide_list add: [com.google.android.tag]
12-26 17:08:36.669 509 10589 I Magisk : hide_list add: [com.google.android.marvin.talkback]
12-26 17:08:36.973 509 10591 I Magisk : hide_list add: [com.google.android.apps.messaging]
12-26 17:08:37.118 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:08:38.233 509 10593 I Magisk : hide_list add: [com.google.android.apps.maps]
12-26 17:08:38.566 509 10595 I Magisk : hide_list add: [com.google.android.feedback]
12-26 17:08:38.919 509 10597 I Magisk : hide_list add: [com.google.android.apps.photos.scanner]
12-26 17:08:39.195 509 10599 I Magisk : hide_list add: [com.google.android.talk]
12-26 17:08:40.531 509 10601 I Magisk : hide_list add: [com.google.android.apps.translate]
12-26 17:08:40.818 509 10603 I Magisk : hide_list add: [com.google.android.apps.hangoutsdialer]
12-26 17:08:41.223 509 10605 I Magisk : hide_list add: [com.google.android.calculator]
12-26 17:08:42.386 509 10607 I Magisk : hide_list add: [com.google.android.setupwizard]
12-26 17:08:42.722 509 10609 I Magisk : hide_list add: [com.google.android.inputmethod.pinyin]
12-26 17:08:42.993 509 10611 I Magisk : hide_list add: [com.google.android.packageinstaller]
12-26 17:08:43.834 509 552 I Magisk : proc_monitor: com.google.android.inputmethod.pinyin (PID=10612 ns=mnt:[4026534279])
12-26 17:08:43.834 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:08:53.853 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:09:08.367 509 552 I Magisk : proc_monitor: com.google.android.packageinstaller (PID=10799 ns=mnt:[4026534446])
12-26 17:09:08.367 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:09:18.385 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:24:16.091 509 552 I Magisk : proc_monitor: com.google.android.partnersetup (PID=11966 ns=mnt:[4026534302])
12-26 17:24:16.094 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:24:26.110 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:26:01.112 509 552 I Magisk : proc_monitor: com.android.vending (PID=12155 ns=mnt:[4026534438])
12-26 17:26:01.113 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:26:01.170 509 552 I Magisk : proc_monitor: com.android.vending (PID=12171 ns=mnt:[4026534446])
12-26 17:26:01.170 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:26:11.184 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:27:02.189 509 552 I Magisk : proc_monitor: com.google.android.gms.unstable (PID=12502 ns=mnt:[4026534383])
12-26 17:27:02.190 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:27:12.211 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:43:41.625 509 552 I Magisk : proc_monitor: com.google.android.apps.translate (PID=14490 ns=mnt:[4026534354])
12-26 17:43:41.631 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:43:46.990 509 552 I Magisk : proc_monitor: com.google.android.partnersetup (PID=14748 ns=mnt:[4026534449])
12-26 17:43:46.990 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:43:57.022 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:45:46.434 509 552 I Magisk : proc_monitor: com.google.android.packageinstaller (PID=15066 ns=mnt:[4026534447])
12-26 17:45:46.434 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:45:56.450 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:52:59.564 509 552 I Magisk : proc_monitor: com.google.android.talk (PID=15862 ns=mnt:[4026534289])
12-26 17:52:59.564 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:53:05.752 509 552 I Magisk : proc_monitor: com.google.android.talk (PID=15922 ns=mnt:[4026534354])
12-26 17:53:05.752 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:53:07.299 509 552 I Magisk : proc_monitor: com.google.android.apps.translate (PID=16011 ns=mnt:[4026534442])
12-26 17:53:07.299 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:53:10.308 509 552 I Magisk : proc_monitor: com.google.android.partnersetup (PID=16420 ns=mnt:[4026534453])
12-26 17:53:10.308 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 17:53:20.333 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 18:22:52.969 509 552 I Magisk : proc_monitor: com.google.android.apps.messaging (PID=19577 ns=mnt:[4026534393])
12-26 18:22:52.970 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 18:23:02.997 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 18:44:06.897 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 18:44:16.910 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 18:53:13.221 509 552 I Magisk : proc_monitor: com.google.android.apps.messaging (PID=23855 ns=mnt:[4026534466])
12-26 18:53:13.225 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 18:53:13.254 509 552 I Magisk : proc_monitor: com.google.android.talk (PID=23880 ns=mnt:[4026534474])
12-26 18:53:22.357 509 552 I Magisk : proc_monitor: com.google.android.talk (PID=24030 ns=mnt:[4026534446])
12-26 18:53:22.357 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 18:53:32.368 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 18:53:38.047 509 552 I Magisk : proc_monitor: com.android.vending (PID=24123 ns=mnt:[4026534464])
12-26 18:53:38.048 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy
12-26 18:53:48.060 509 552 E Magisk : mount (null)->/ failed with 16: Device or resource busy