>>>> 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: >>>> >>> Is that the only mountpoint possible? >>> The tool needs to detect a valid mount point to locate the named cgroup. >>> That's assuming that if I create cgroup foo, then it appears under >>> //sys/fs/cgroup/systemd/foo >>> >> >> There can be only one cgroupfs mountpoint which has perf_event subsystem >> attached to it. >> >> So for this setup: >> >> mount -t tmpfs /sys/fs/cgroup >> mkdir /sys/fs/cgroup/memory >> mkdir /sys/fs/cgroup/perf >> mount -t cgroup -o memory memcg /sys/fs/cgroup/memory >> mount -t cgroup -o perf_event perf /sys/fs/cgroup/perf >> >> The perf tool will locate the mountpoint as /sys/fs/cgroup/perf. >> > You can mount the cgroup fs for perf_event multiple times. I > tried and it works, though it is useless. >
Yes, but they are the same. > Vince, I think the correct way to detect which entry is for perf_event > is to look for filesystem type cgroup and option perf_event. It cannot > be anything else. First match is good enough. > . +1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
