1f7c167b2
Denys Vlasenko
2009-09-06
Subject
experimentally add mallopt tweaks for reduced memory consumption
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libbb/appletlib.c+20 -0
| @@ -28,6 +28,8 @@ | |
| */ | |
| #include <assert.h> | |
| + | #include <malloc.h> |
| + | #include <sys/user.h> /* PAGE_SIZE */ |
| #include "busybox.h" | |
| @@ -763,6 +765,24 @@ int lbb_main(char **argv) | |
| int main(int argc UNUSED_PARAM, char **argv) | |
| #endif | |
| { | |
| + | /* Tweak malloc for reduced memory consumption */ |
| + | #ifndef PAGE_SIZE |
| + | # define PAGE_SIZE (4*1024) /* guess */ |
| + | #endif |
| + | #ifdef M_TRIM_THRESHOLD |
| + | /* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory |
| + | * to keep before releasing to the OS |
| + | * Default is way too big: 256k |
| + | */ |
| + | mallopt(M_TRIM_THRESHOLD, 2 * PAGE_SIZE); |
| + | #endif |
| + | #ifdef M_MMAP_THRESHOLD |
| + | /* M_MMAP_THRESHOLD is the request size threshold for using mmap() |
| + | * Default is too big: 256k |
| + | */ |
| + | mallopt(M_MMAP_THRESHOLD, 8 * PAGE_SIZE - 256); |
| + | #endif |
| + | |
| #if defined(SINGLE_APPLET_MAIN) | |
| /* Only one applet is selected by the user! */ | |
| /* applet_names in this case is just "applet\0\0" */ | |