Namhyung Kim <namhyung@xxxxxxxxxx> writes: > On Wed, Jul 02, 2025 at 12:15:02PM -0400, Steven Rostedt wrote: >> On Wed, 02 Jul 2025 12:44:51 +0100 >> Sam James <sam@xxxxxxxxxx> wrote: >> >> > In one of the commit messages in the perf series, Steven also gave >> > `perf record -g -vv true` which was convenient for making sure it's >> > correctly discovered deferred unwinding support. >> >> Although I posted the patch, the command "perf record -g -vv true" was >> Namhyung's idea. Just wanted to give credit where credit was due. > > Yep, it's to check if perf tool ask the deferred callchain to the > kernel. To check if the kernel returns the callchain properly is: > > $ perf report -D | grep -A5 CALLCHAIN_DEFERRED Thanks both. I'll update my notes and tinker more. > > Thanks, > Namhyung sam
