Commit | Line | Data |
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5e0cbfb0 PP |
1 | --- |
2 | id: channel-buffering-schemes | |
3 | --- | |
4 | ||
5 | In the user space tracing domain, two **buffering schemes** are | |
6 | available when creating a channel: | |
7 | ||
8 | * **Per-PID buffering**: keep one ring buffer per process. | |
9 | * **Per-UID buffering**: keep one ring buffer for all processes of | |
10 | a single user. | |
11 | ||
47bfcb75 | 12 | The per-PID buffering scheme consumes more memory than the per-UID |
5e0cbfb0 PP |
13 | option if more than one process is instrumented for LTTng-UST. However, |
14 | per-PID buffering ensures that one process having a high event | |
15 | throughput won't fill all the shared sub-buffers, only its own. | |
16 | ||
17 | The Linux kernel tracing domain only has one available buffering scheme | |
18 | which is to use a single ring buffer for the whole system. |