On Tue, Mar 29, 2022 at 8:36 PM Andrey Konovalov <andreyknvl@xxxxxxxxx> wrote: > > On Mon, Mar 28, 2022 at 2:36 PM Marco Elver <elver@xxxxxxxxxx> wrote: > > > > > Changes v1->v2: > > > - Provide a kernel-wide stack_trace_save_shadow() interface for collecting > > > stack traces from shadow stack. > > > - Use ptrauth_strip_insn_pac() and READ_ONCE_NOCHECK, see the comments. > > > - Get SCS pointer from x18, as per-task value is meant to save the SCS > > > value on CPU switches. > > > - Collect stack frames from SDEI and IRQ contexts. > > > > Do any of these new changes introduce new (noticeable) overhead (in > > particular patch 2)? > > I'll measure the overheads and include the results into v3. Thanks! Hm, looks like the overhead is overly significant: ~5%. I'll explore a different approach in v3 instead.
