trace-cmd-snapshot (1) - Linux Man Pages
trace-cmd-snapshot: take, reset, free, or show a Ftrace kernel snapshot
trace-cmd-snapshot - take, reset, free, or show a Ftrace kernel snapshot
The trace-cmd(1) snapshot controls or displays the Ftrace Linux kernel snapshot feature (if the kernel supports it). This is useful to "freeze" an instance of a live trace but without stopping the trace.
trace-cmd start -p function trace-cmd snapshot -s trace-cmd snapshot [ dumps the content of buffer at 'trace-cmd snapshot -s' ] trace-cmd snapshot -s trace-cmd snapshot [ dumps the new content of the buffer at the last -s operation ]
- Take a snapshot of the currently running buffer.
- Clear out the buffer.
- Free the snapshot buffer. The buffer takes up memory inside the kernel. It is best to free it when not in use. The first -s operation will allocate it if it is not already allocated.
- Operate on a per cpu snapshot (may not be fully supported by all kernels)
- If a buffer instance was created, then the -B option will operate on the snapshot within the buffer.
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