8003e266e
Denis Vlasenko
2007-12-02
Subject
explain why we use mmap instead of malloc
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libbb/copyfd.c+2 -0
| @@ -22,6 +22,8 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size) | |
| char *buffer; | |
| int buffer_size; | |
| + | /* We want page-aligned buffer, just in case kernel is clever |
| + | * and can do page-aligned io more efficiently */ |
| buffer = mmap(NULL, CONFIG_FEATURE_COPYBUF_KB * 1024, | |
| PROT_READ | PROT_WRITE, | |
| MAP_PRIVATE | MAP_ANON, | |