On 2014/12/17 1:17, Vince Weaver wrote:
> On Mon, 15 Dec 2014, Stephane Eranian wrote:
>> On Mon, Dec 15, 2014 at 11:01 PM, Arnaldo Carvalho de Melo
>> <[email protected]> wrote:
>
>> fs is visible. The cgroup file system type is not there anymore. They are
>> using
>> tmpfs which is not ideal to detect just cgroup. Looks like now, we have to
>> look
>> at the mount point which is flaky.
>
> The trivial fix is to just always assume things will be under
> /sys/fs/cgroup
> which looks like to be the new official mount point.
>
> This will break on older systems though, or systems that mount cgroupfs in
> multiple locations.
>
> Another alternative is to change the interface to require the full
> cgroupfs pathname as an argument to -G
>
What's the problem here?
none /sys/fs/cgroup tmpfs rw,relatime,size=4k,mode=755 0 0
systemd /sys/fs/cgroup/systemd cgroup
rw,nosuid,nodev,noexec,relatime,perf_event,name=systemd 0 0
cgroup is mounted in /sys/fs/cgroup/systemd, so you should pass '/' to the -G
argument:
sudo perf stat -a -e cycles:u,cycles:u,cycles:u -G / -- sleep 1
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