On Tue, 9 May 2023 16:30:50 -0400 Steven Rostedt <rostedt@xxxxxxxxxxx> wrote: > >From the user space side, which does: > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/samples/user_events/example.c#n60 > > /* Check if anyone is listening */ > if (enabled) { Hmm, looking at this deeper, we should update it to prevent the compiler from optimizing it, and keeping "enabled" in a register. Which would not work. Should probably add: if (*(const volatile int *)&enabled) { -- Steve > /* Yep, trace out our data */ > writev(data_fd, (const struct iovec *)io, 2); > > /* Increase the count */ > count++; > > printf("Something was attached, wrote data\n"); > }
