bc14f4d13
Denys Vlasenko
2016-04-03
Subject
main(): add a TODO about finding a use for _end[] area
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libbb/appletlib.c+13 -0
| @@ -902,6 +902,19 @@ int lbb_main(char **argv) | |
| int main(int argc UNUSED_PARAM, char **argv) | |
| #endif | |
| { | |
| + | #if 0 |
| + | /* TODO: find a use for a block of memory between end of .bss |
| + | * and end of page. For example, I'm getting "_end:0x812e698 2408 bytes" |
| + | * - more than 2k of wasted memory (in this particular build) |
| + | * *per each running process*! |
| + | * (If your linker does not generate "_end" name, weak attribute |
| + | * makes &_end == NULL, end_len == 0 here.) |
| + | */ |
| + | extern char _end[] __attribute__((weak)); |
| + | unsigned end_len = (-(int)_end) & 0xfff; |
| + | printf("_end:%p %u bytes\n", &_end, end_len); |
| + | #endif |
| + | |
| /* Tweak malloc for reduced memory consumption */ | |
| #ifdef M_TRIM_THRESHOLD | |
| /* M_TRIM_THRESHOLD is the maximum amount of freed top-most memory | |