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Wednesday, October 28 • 17:30 - 17:40
Lightning Talk: Unravelling the Linux Kernel Using BPF Raw Tracepoints - Abhijit Singh, Uber

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This talk aims at presenting the potential of BPF raw tracepoints. In a static tracepoints present in the Linux kernel, a dynamic tracer like ftrace or kprobe+bpf, might not get desired information about arguments passed in the tracepoint(e.g. many fields related to the task_switch struct aren't accessible such as nvcsw and nivcsw in the sched_switch tracepoint). With the introduction of BPF raw tracepoints, we can create a BPF program which can investigate each argument being passed to the tracepoint upon its invocation. The talk will commence with the rationale to introduce a raw BPF tracepoint. It would then present the signature of the BPF_RAW_TRACEPOINT api. It would also present a couple of example BPF programs which use raw tracepoints. 1) a program which prints the arguments being passed to the openat system call 2) a program which calculates total involuntary context switches, voluntary context switches over time for a system The talk would also highlight the low performance overhead of raw tracepoint as compared to other tracing infrastructure like kprobe+bpf.

Speakers
avatar for Abhijit Singh

Abhijit Singh

Software Engineer, Uber
I'm a software engineer, currently working in Uber. Previously, I used to work as a Performance Engineer at Azul Systems where I conducted thorough performance analysis of JVM applications and the underlying systems. I'm a keen systems performance enthusiast and follow Linux kernel... Read More →


Wednesday October 28, 2020 17:30 - 17:40 GMT
Linux Systems Theater
  Linux Systems, Tracing