You can find it in init.rc:
# Define the oom_adj values for the classes of processes that can be
# killed by the kernel. These are used in ActivityManagerService.
setprop ro.FOREGROUND_APP_ADJ 0
setprop ro.VISIBLE_APP_ADJ 1
setprop ro.SECONDARY_SERVER_ADJ 2
setprop ro.BACKUP_APP_ADJ 2
setprop ro.HOME_APP_ADJ 4
setprop ro.HIDDEN_APP_MIN_ADJ 7
setprop ro.CONTENT_PROVIDER_ADJ 14
setprop ro.EMPTY_APP_ADJ 15
# Define the memory thresholds at which the above process classes will
# be killed. These numbers are in pages (4k).
setprop ro.FOREGROUND_APP_MEM 1536
setprop ro.VISIBLE_APP_MEM 2048
setprop ro.SECONDARY_SERVER_MEM 4096
setprop ro.BACKUP_APP_MEM 4096
setprop ro.HOME_APP_MEM 4096
setprop ro.HIDDEN_APP_MEM 5120
setprop ro.CONTENT_PROVIDER_MEM 5632
setprop ro.EMPTY_APP_MEM 6144
And the use of these value is in ActivityManagerService.java
在 2012年2月13日星期一UTC+8下午3时09分42秒，Sean kim写道：
>
> I'm curious about how google select the value of minfree.
>
> I checked Nesus-S(GB) minfree value. It has below value.
>
> *adj: 0,1,2,4,7,15
> *minfree: 3072,4096,5120,7168,8192,9216
>
> I think that the first value of minfree 3072(8M) is dependency of all
> process's cached memory size.
>
> but I don't know How google get the first value.
>
> even I modifed procrank.c to calculate every process's cached size to
> find the first minfree value
>
> Is there any rule or method?
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