Messages in this thread | | | Subject | Re: [RFC 00/13] perf: Add perf kwork | From | Yang Jihong <> | Date | Thu, 23 Jun 2022 09:02:45 +0800 |
| |
Hello,
On 2022/6/22 22:59, Paul A. Clarke wrote: > On Mon, Jun 13, 2022 at 05:45:52PM +0800, Yang Jihong wrote: >> Sometimes, we need to analyze time properties of kernel work such as irq, >> softirq, and workqueue, such as delay and running time of specific interrupts. >> Currently, these events have kernel tracepoints, but perf tool does not >> directly analyze the delay of these events >> >> The perf-kwork tool is used to trace time properties of kernel work >> (such as irq, softirq, and workqueue), including runtime, latency, >> and timehist, using the infrastructure in the perf tools to allow >> tracing extra targets >> >> test case: >> >> # perf kwork report >> >> Kwork Name | Cpu | Total Runtime | Frequency | Max runtime | Max runtime start | Max runtime end | >> --------------------------------------------------------------------------------------------------------------------------- >> (s)RCU:9 | 0007 | 3.488 ms | 1258 | 0.145 ms | 3398384.220013 s | 3398384.220157 s | >> (s)NET_RX:3 | 0003 | 1.866 ms | 156 | 0.042 ms | 3398385.629764 s | 3398385.629806 s | >> (s)TIMER:1 | 0000 | 1.799 ms | 117 | 0.055 ms | 3398385.568033 s | 3398385.568088 s | >> (w)0xffff9c66e563ee98 | 0006 | 1.561 ms | 5 | 0.351 ms | 3398384.060021 s | 3398384.060371 s | > > What units are used for "Frequency"? It would be helpful to include somewhere. This refers to the number of event in the trace period.
Thanks, Jihong > > PC > . >
| |