On Tue, 5 Dec 2023 11:52:23 -0500 Steven Rostedt <rost...@goodmis.org> wrote:
> From: "Steven Rostedt (Google)" <rost...@goodmis.org> > > It use to be that only the top level instance had a snapshot buffer (for > latency tracers like wakeup and irqsoff). The update of the ring buffer > size would check if the instance was the top level and if so, it would > also update the snapshot buffer as it needs to be the same as the main > buffer. > > Now that lower level instances also has a snapshot buffer, they too need > to update their snapshot buffer sizes when the main buffer is changed, > otherwise the following can be triggered: > > # cd /sys/kernel/tracing > # echo 1500 > buffer_size_kb > # mkdir instances/foo > # echo irqsoff > instances/foo/current_tracer > # echo 1000 > instances/foo/buffer_size_kb > Bah, this is only a partial patch, in fact it doesn't even fix the issue. It fixes another issue that this issue is dependent on. I'll send out a v2 shortly. -- Steve
