Em Fri, Apr 10, 2015 at 12:17:08PM -0400, Jueyuan Zhu escreveu:
> Hi Chris,
>
> Thanks for your suggestions. Since I am using the perf_event_open in the host
> OS, not in the guest OS. So does it need the support of PMU virtualization? I
> used the perf command below to measure the VM, and it can give correct
> results. So I am wondering how to use perf_event_open to get the same results
> as the perf user command?
>
> #perf stat -e instructions -p VM_id sleep 1
Try adding -vv to the above perf stat command, it will show you how it
is setting up perf_event_attr, as well as the other arguments to
sys_perf_event_open, for example:
[acme@zoo linux]$ perf stat -vv -e instructions usleep 1
------------------------------------------------------------
perf_event_attr:
size 112
config 1
read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
disabled 1
inherit 1
enable_on_exec 1
exclude_guest 1
------------------------------------------------------------
sys_perf_event_open: pid 3530 cpu -1 group_fd -1 flags 0x8
instructions: 632294 767399 767399
Performance counter stats for 'usleep 1':
632.294 instructions
0,001521851 seconds time elapsed
[acme@zoo linux]$
- Arnaldo
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