Re: [Question] How does perf still record the stack of a specified pid even when that process is interrupted and CPU is scheduled to other process

[David Ahern]

On 4/24/15 7:31 AM, Yunlong Song wrote:
> [Profiling Problem]
>
> Although perf can record the events (with call stack) of a specified pid, e.g. using
> "perf record -g iozone -s 262144 -r 64 -i 0 -i 2". But we find iozone is interrupted

That command tells perf to *only* collect data for iozone. This command:

    perf record -g -a -- iozone ....

tells perf to collect samples system wide as long as the iozone process 
is alive.

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