January 2018
Intermediate to advanced
456 pages
12h 49m
English
Content preview from Embedded Linux Development Using Yocto Project Cookbook - Second Edition
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Perf can use dynamic events to extend the event list to any location where kprobe can be placed. For this, configure the kernel for kprobe and uprobe support (if available), as seen in the Using dynamic kernel events recipe earlier.
- To add a probe point in a specific function execute the following command:
# perf probe --add "tcp_sendmsg" Added new event: probe:tcp_sendmsg (on tcp_sendmsg)
- You can now use it in all perf tools, such as profiling the download of a file:
# perf record -e probe:tcp_sendmsg -a -g -- wget http://downloads.yoctoproject.org/releases/yocto/yocto- 2.4/RELEASENOTES Connecting to downloads.yoctoproject.org (198.145.29.10:80) RELEASENOTES 100% |**************************************************************************************| ...
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