On Wed, 21 Jan 2015 17:49:08 -0800 Alexei Starovoitov <ast@xxxxxxxxxxxx> wrote: > > This also makes it keeping events in the soft-disabled state. > > I was never able to figure out the use case for soft-disabled state. > Probably historical before static_key was done. No, it's not historical at all. The "soft-disable" is a way to enable from any context. You can't enable a static key from NMI or interrupt context, but you can enable a "soft-disable" there. As you can enable or disable events from any function that the function tracer may trace, I needed a way to enable them (make the tracepoint active), but do nothing until something else turns them on. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
