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ng9uiJ3Fcz0i7GfN4q6wubUd0Bdjj1M9DVRe43Cs= On 6/2/26 6:00 AM, Steven Rostedt wrote: > On Mon, 1 Jun 2026 16:24:43 -0700 > Manjunath Patil wrote: > >> Ftrace keeps trace arrays at a boot-minimum ring-buffer size until >> tracing is used. Tracefs event-enable paths already call >> tracing_update_buffers() before enabling events, but the exported >> in-kernel helpers trace_set_clr_event() and trace_array_set_clr_event() >> directly enable events through __ftrace_set_clr_event(). >> >> This can leave events enabled by in-kernel users recording into the tiny >> boot-minimum buffer instead of the configured default-sized buffer. Any >> caller that enables events through these exported helpers observes >> different buffer-expansion behavior than a userspace tracefs event enable. >> >> Expand the relevant trace array before enabling events through the >> exported in-kernel helpers, matching the tracefs event-enable behavior. >> Disabling events remains unchanged. > > The above explains everything correctly, but you left out what needs this? > > Internal code should not be using the main ring buffer except for > debugging, in which case you can use trace_printk(), which will cause the > tracing buffers to be expanded by default. > > Other areas of the kernel should create their own trace array which will be > created expanded by default too. > > -- Steve Thanks Steve, that makes sense. The concrete case I was trying to address is not an upstream in-tree user. It is a downstream UEK RDS compatibility path where the legacy rds_rt_debug_bitmap module parameter is mapped to RDS tracepoints by calling trace_set_clr_event() against the global trace array during module init. That can leave the default RDS tracepoints recording into the boot-minimum buffer unless userspace expands tracing first. Looking at mainline again, trace-array users are already created expanded by default, and the remaining global-buffer use is debugging-style. So I agree this generic tracing/events change does not have a good upstream justification. Please drop this patch. We will handle the downstream RDS compatibility case downstream, or move it to an explicit userspace/trace-array setup. Thanks, Manjunath