On Sun, Dec 03, 2023 at 02:32:15PM +0900, Dominique Martinet wrote: > Steven Rostedt wrote on Sat, Dec 02, 2023 at 11:15:24PM -0500: > > > Also, for custom tracepoints e.g. bpftrace the program needs to know how > > > many bytes can be read safely even if it's just for dumping -- unless > > > dynamic_array is a "fat pointer" that conveys its own size? > > > (Sorry didn't take the time to check) > > > > Yes, there's also a __get_dynamic_array_len(line) that will return the > > allocated length of the line. Is that what you need? > > Yes, thanks! So the lower two bytes of the field are its position in > the entry and the higher two bytes its size; ok. > It doesn't look like bpftrace has any helper for it but that can > probably be sorted out if someone wants to dump data there. > > > Let's update the event to use a dynamic array and have printk fomrat to > use %*ph with that length. > > JP Kobryn, does that sound good to you? I'm not sure what you were > trying to do in the first place. > Do you want to send a v2 or shall I? Sounds good. I'll send out a v2. Thanks Steve for recommending the dynamic array macros. JP > > -- > Dominique Martinet | Asmadeus
