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explain why we use mmap instead of malloc
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@ -22,6 +22,8 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
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char *buffer;
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int buffer_size;
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/* We want page-aligned buffer, just in case kernel is clever
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* and can do page-aligned io more efficiently */
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buffer = mmap(NULL, CONFIG_FEATURE_COPYBUF_KB * 1024,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANON,
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