On Sat, 2013-06-22 at 13:08 +0800, Jovi Zhang wrote: > > I would really like to make these smaller. They are made for every > > system call, and I consider tracing to always be added overhead. I hate > > it when we waste more memory for tracing as very few people use it > > (compared to those that use Linux). > > > > Is it possible to allocate this only when its first used? > > > > -- Steve > > I think the answer is yes. > > Compare with link ftrace_event_file with static syscall_metadata, another > option > is put into structure trace_array, just like enabled_enter_syscalls and > enabled_exit_syscalls BITMAP already in there > (need change to dynamic allocated NR_syscalls array, just keep a > pointer in trace_array). > > Then in this way, there don't have any extra size overhead for static > syscall_metadata, > but need to allocate a array with NR_syscalls elements when first use > syscall tracing. > > which option do you prefer? steven.
Hey, if it only allocates when tracing is used, that's a big plus. Tracing should be treated as a drug. Just like not allowing smoking in public places, only punish the users, not those that want to breath fresh air. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
