Is it possible to dump only trace_printk() outputs in trace file? I mean filter out all functions in function tracer (or any other tracer).
是否可能仅在跟踪文件中转储trace_printk()输出?我的意思是过滤掉函数跟踪程序(或任何其他跟踪程序)中的所有函数。
1 个解决方案
#1
2
In general, you can switch options off inside of the options directory, /sys/kernel/debug/tracing/options. Use ls to display all toggle-able options.
通常，您可以在options目录/sys/内核/调试/跟踪/选项中关闭选项。使用ls显示所有可切换选项。
# ls
annotate context-info funcgraph-abstime funcgraph-overhead func_stack_trace hex overwrite record-cmd sym-offset trace_printk
bin disable_on_free funcgraph-cpu funcgraph-overrun function-fork irq-info printk-msg-only sleep-time sym-userobj userstacktrace
blk_classic display-graph funcgraph-duration funcgraph-proc function-trace latency-format print-parent stacktrace test_nop_accept verbose
block event-fork funcgraph-irqs
Toggle options via echo, i.e.,
切换选项通过echo，即，
echo -n "1" > /sys/kernel/debug/tracing/options/trace_printk
echo -n "1" > /sys/内核/调试/跟踪/选项/trace_printk
If you are trying to filter out any output that was not produced by trace_printk(), you would likely need to ensure that trace_printk() is the only option set.
如果您试图过滤掉trace_printk()不生成的任何输出，您可能需要确保trace_printk()是惟一的选项集。
It's always good to check out the kernel documentation when in doubt. There's also a great lwn article that helped me out when I was first learning ftrace called Secrets of the Ftrace function tracer, which includes some sections about filtering in general.
当有疑问时，检查内核文档总是好的。在我第一次学习ftrace的时候，有一篇很棒的文章帮助我解决了ftrace，叫做ftrace函数跟踪器的秘密。
#1
2
In general, you can switch options off inside of the options directory, /sys/kernel/debug/tracing/options. Use ls to display all toggle-able options.
通常，您可以在options目录/sys/内核/调试/跟踪/选项中关闭选项。使用ls显示所有可切换选项。
# ls
annotate context-info funcgraph-abstime funcgraph-overhead func_stack_trace hex overwrite record-cmd sym-offset trace_printk
bin disable_on_free funcgraph-cpu funcgraph-overrun function-fork irq-info printk-msg-only sleep-time sym-userobj userstacktrace
blk_classic display-graph funcgraph-duration funcgraph-proc function-trace latency-format print-parent stacktrace test_nop_accept verbose
block event-fork funcgraph-irqs
Toggle options via echo, i.e.,
切换选项通过echo，即，
echo -n "1" > /sys/kernel/debug/tracing/options/trace_printk
echo -n "1" > /sys/内核/调试/跟踪/选项/trace_printk
If you are trying to filter out any output that was not produced by trace_printk(), you would likely need to ensure that trace_printk() is the only option set.
如果您试图过滤掉trace_printk()不生成的任何输出，您可能需要确保trace_printk()是惟一的选项集。
It's always good to check out the kernel documentation when in doubt. There's also a great lwn article that helped me out when I was first learning ftrace called Secrets of the Ftrace function tracer, which includes some sections about filtering in general.
当有疑问时，检查内核文档总是好的。在我第一次学习ftrace的时候，有一篇很棒的文章帮助我解决了ftrace，叫做ftrace函数跟踪器的秘密。