Messages in this thread | ![/](/images/icornerl.gif) | | Date | Tue, 12 Dec 2023 19:15:46 -0500 | From | Steven Rostedt <> | Subject | Re: [PATCH 08/15] tracing: Introduce names for ring buffers |
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On Wed, 13 Dec 2023 00:04:45 +0000 Alexander Graf <graf@amazon.com> wrote:
> With KHO (Kexec HandOver), we want to preserve trace buffers across > kexec. To carry over their state between kernels, the kernel needs a > common handle for them that exists on both sides. As handle we introduce > names for ring buffers. In a follow-up patch, the kernel can then use > these names to recover buffer contents for specific ring buffers. >
Is there a way to use the trace_array name instead?
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.
-- Steve
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