On Fri, 23 Feb 2007 03:06:45 +0000, Ralf Baechle <ralf@xxxxxxxxxxxxxx> wrote: > There used to be a configuration option to allow logging which was a > leftover from the times when I implemented the unaligned emulation. I > did never find it useful later on, so I removed that in almost 9 years > ago and nobody missed it since :-) > > But I don't mind putting it back, controllable by sysctl if there is any > demand for it. Sometimes I want to know a value of unaligned_instructions variable, to make sure nobody is causing such exceptions. I just wanted to know the statistics and did not want to control it, but showing name of the process and PC would help to find out who is guilty. I wonder if anybody really want to handle the exception manually. So how about this interface? 1. echo show > /sys/kernel/unaligned_action Show register dump and processor name at each unaligned exception, using show_regs() or someting. 2. echo quiet > /sys/kernel/unaligned_action Siliently fixup unaligned exceptions. 3. cat /sys/kernel/unaligned_instructions Print unaligned_instructions variable. Creating files in /sys/kernel is fairly simple: subsys_create_file(&kernel_subsys, &foo_attr); Any comments? --- Atsushi Nemoto
