On Wed, 13 Dec 2023 01:35:16 +0100 Alexander Graf <graf@xxxxxxxxxx> wrote: > > The trace_array is the structure that represents each tracing instance. And > > it already has a name field. And if you can get the associated ring buffer > > from that too. > > > > struct trace_array *tr; > > > > tr->array_buffer.buffer > > > > tr->name > > > > When you do: mkdir /sys/kernel/tracing/instance/foo > > > > You create a new trace_array instance where tr->name = "foo" and allocates > > the buffer for it as well. > > The name in the ring buffer is pretty much just a copy of the trace > array name. I use it to reconstruct which buffer we're actually > referring to inside __ring_buffer_alloc(). No, I rather not tie the ring buffer to the trace_array. > > I'm all ears for alternative suggestions. I suppose we could pass tr as > argument to ring_buffer_alloc() instead of the name? I'll have to spend some time (that I don't currently have :-( ) on looking at this more. I really don't like the copying of the name into the ring buffer allocation, as it may be an unneeded burden to maintain, not to mention the duplicate field. -- Steve
