On Tue, 1 Mar 2022 10:05:12 +0100 Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > On Mon, Feb 28, 2022 at 05:04:11PM -0800, Namhyung Kim wrote: > > The __mutex_lock_slowpath() and friends are declared as noinline and > > _RET_IP_ returns its caller as mutex_lock which is not meaningful. > > Pass the ip from mutex_lock() to have actual caller info in the trace. > > Blergh, can't you do a very limited unwind when you do the tracing > instead? 3 or 4 levels should be plenty fast and sufficient. Is there a fast and sufficient way that works across architectures? Could objtool help here? -- Steve
