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Document using libmemunreachable on an app 

Document dumpsys meminfo --unreachable, and how to enable
malloc_debug backtraces on a single app.

Test: none
Change-Id: I649afdfff1c7438f74950395639b06c39cae3ca0
This commit is contained in:
Colin Cross 2018-05-17 16:11:53 -07:00
parent 3464bc4b43
commit 18f3685600
1 changed files with 21 additions and 0 deletions
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libmemunreachable/README.md
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@ -12,6 +12,27 @@ In the default (zero-overhead) mode, the returned data on leaks is limited to th
Usage
-------
### In Android apps ###
libmemunreachble is loaded by zygote and can be triggered with `dumpsys -t 600 meminfo --unreachable [process]`.
To enable malloc\_debug backtraces on allocations for a single app process on a userdebug device, use:
```
adb root
adb shell setprop libc.debug.malloc.program app_process
adb shell setprop wrap.[process] "\$\@"
adb shell setprop libc.debug.malloc.options backtrace=4
```
Kill and restart the app, trigger the leak, and then run `dumpsys -t 600 meminfo --unreachable [process]`.
To disable malloc\_debug:
```
adb shell setprop libc.debug.malloc.options "''"
adb shell setprop libc.debug.malloc.program "''"
adb shell setprop wrap.[process] "''"
```
### C interface ###
#### `bool LogUnreachableMemory(bool log_contents, size_t limit)` ####