On Sat, Mar 21 2015, Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx> wrote: > With CONFIG_DEBUG_INFO_REDUCED, we do get quite a lot of debug info > (around 22.7 MB for a defconfig+DEBUG_INFO_REDUCED). However, the > "basenames must match" rule used by -femit-struct-debug-baseonly > option means that we miss some core data structures, such as struct > {device, file, inode, mm_struct, page} etc. > > We can easily get these included as well, while still getting the > benefits of CONFIG_DEBUG_INFO_REDUCED (faster build times and smaller > individual object files): All it takes is a dummy translation unit > including a few strategic headers and compiled with a flag overriding > -femit-struct-debug-baseonly. > > This increases the size of .debug_info by ~0.3%, but these 90 KB > contain some rather useful info. > Any comments on this patch? I know it's a little hacky, but I do find it rather useful. For example, I just noticed that pahole shows this struct audit_names { struct list_head list; /* 0 0 */ /* XXX 16 bytes hole, try to pack */ when applied to a vmlinux built with DEBUG_INFO_REDUCED, since debug info for struct list_head is not included. The same is true for a lot of other types which are often embedded in structs (e.g. spinlock_t and atomic_t). I could of course just compile without DEBUG_INFO_REDUCED, but the time and space savings of that are real and sad to lose (my tree is 1.8 GB larger when I compile without it). Rasmus -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html