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

From: David Ahern
Date: Fri Apr 24 2015 - 09:49:56 EST

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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