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gerrit.twrp.me / android_bootable_recovery / a60c78602d2b6746ad093fc3fd30fcc8980aac55
commita60c78602d2b6746ad093fc3fd30fcc8980aac55[log] [tgz]
authorEthan Yonker <dees_troy@teamw.in>Thu Feb 25 15:32:06 2016 -0600
committerDees Troy <dees_troy@teamw.in>Mon Feb 29 15:22:48 2016 +0100
tree79db5161ef5e4dc2b589eeabaa3d37f3b60868f2
parent9a561dd2b36fb0576047648165bca59ac7894d73 [diff]
Remove busybox modprobe to fix slow performance for some devices

bionic process initialization calls personality
(specifically personality-8)
personality wants to load a kernel module
loading a kernel module calls /sbin/modprobe
loading /sbin/modprobe is a bionic process initialization
bionic process initialization calls personality
personality wants to load a kernel module
loading a kernel module calls /sbin/modprobe . . .

Before you know it, it takes 0.5 seconds to do anything.
Note: modprobe is still technically available, but the symlink
has been removed, so you can still call it directly by running
busybox modprobe if you like.

From what I can tell, this issue only affects 32 bit devices
with CONFIG_MODULES=y in the defconfig. The problem can be also
patched out of the kernel by commenting or otherwise removing
the block of code in kernel/exec_domain.c inside the CONFIG_MODULES
ifdef block

It is also possible to patch the problem in bionic libc by commenting
out or otherwise removing the __initialize_personality in bionic/libc/
bionic/libc_init_common.cpp file.

Change-Id: Iebac314616080ac18320d73b087980ac1b98b951
1 file changed
tree: 79db5161ef5e4dc2b589eeabaa3d37f3b60868f2
  1. applypatch/
  2. bmlutils/
  3. crypto/
  4. digest/
  5. dosfstools/
  6. edify/
  7. etc/
  8. exfat/
  9. fb2png/
  10. flashutils/
  11. fonts/
  12. fuse/
  13. gpt/
  14. gui/
  15. htcdumlock/
  16. injecttwrp/
  17. libblkid/
  18. libcrecovery/
  19. libmincrypt/
  20. libpixelflinger/
  21. libtar/
  22. minadbd/
  23. minadbd.old/
  24. minui/
  25. minui.old/
  26. minuitwrp/
  27. minzip/
  28. mmcutils/
  29. mtdutils/
  30. mtp/
  31. openaes/
  32. orscmd/
  33. pigz/
  34. prebuilt/
  35. res/
  36. res-hdpi/
  37. res-mdpi/
  38. res-xhdpi/
  39. res-xxhdpi/
  40. res-xxxhdpi/
  41. scripts/
  42. sepolicy/
  43. simg2img/
  44. testdata/
  45. tests/
  46. toolbox/
  47. tools/
  48. toybox/
  49. twrpTarMain/
  50. uncrypt/
  51. updater/
  52. .gitignore
  53. adb_install.cpp
  54. adb_install.h
  55. Android.mk
  56. asn1_decoder.cpp
  57. asn1_decoder.h
  58. bootloader.cpp
  59. bootloader.h
  60. CleanSpec.mk
  61. common.h
  62. data.cpp
  63. data.hpp
  64. default_device.cpp
  65. device.cpp
  66. device.h
  67. find_file.cpp
  68. find_file.hpp
  69. fixContexts.cpp
  70. fixContexts.hpp
  71. fuse.h
  72. fuse_sdcard_provider.c
  73. fuse_sdcard_provider.h
  74. fuse_sideload.c
  75. fuse_sideload.h
  76. infomanager.cpp
  77. infomanager.hpp
  78. install.cpp
  79. install.h
  80. interlace-frames.py
  81. legacy_properties.h
  82. legacy_property_service.c
  83. legacy_property_service.h
  84. mounts.c
  85. mounts.h
  86. NOTICE
  87. openrecoveryscript.cpp
  88. openrecoveryscript.hpp
  89. partition.cpp
  90. partitionmanager.cpp
  91. partitions.hpp
  92. README.md
  93. recovery.cpp
  94. recovery_ui.h
  95. roots.cpp
  96. roots.h
  97. screen_ui.cpp
  98. screen_ui.h
  99. set_metadata.c
  100. set_metadata.h
  101. tarWrite.c
  102. tarWrite.h
  103. tw_atomic.cpp
  104. tw_atomic.hpp
  105. twcommon.h
  106. twinstall.cpp
  107. twinstall.h
  108. twrp-functions.cpp
  109. twrp-functions.hpp
  110. twrp.cpp
  111. twrpDigest.cpp
  112. twrpDigest.hpp
  113. twrpDU.cpp
  114. twrpDU.hpp
  115. twrpTar.cpp
  116. twrpTar.h
  117. twrpTar.hpp
  118. ui.cpp
  119. ui.h
  120. variables.h
  121. verifier.cpp
  122. verifier.h
  123. verifier_test.cpp
  124. verifier_test.sh
README.md

Team Win Recovery Project (TWRP)

You can find a compiling guide here.