On Tue, Jan 22, 2019 at 04:42:47PM +0000, Quentin Perret wrote: > The recently introduced Energy Model (EM) framework manages power cost > tables of CPUs. These tables are currently only visible from kernel > space. However, in order to debug the behaviour of subsystems that use > the EM (EAS for example), it is often required to know what the power > costs are from userspace. > > For this reason, introduce under /sys/kernel/debug/energy_model a set of > directories representing the performance domains of the system. Each > performance domain contains a set of sub-directories representing the > different capacity states (cs) and their attributes, as well as a file > exposing the related CPUs. > > The resulting hierarchy is as follows on Arm juno r0 for example: > > /sys/kernel/debug/energy_model > ├── pd0 > │ ├── cpus > │ ├── cs:450000 > │ │ ├── cost > │ │ ├── frequency > │ │ └── power > │ ├── cs:575000 > │ │ ├── cost > │ │ ├── frequency > │ │ └── power > │ ├── cs:700000 > │ │ ├── cost > │ │ ├── frequency > │ │ └── power > │ ├── cs:775000 > │ │ ├── cost > │ │ ├── frequency > │ │ └── power > │ └── cs:850000 > │ ├── cost > │ ├── frequency > │ └── power > └── pd1 > ├── cpus > ├── cs:1100000 > │ ├── cost > │ ├── frequency > │ └── power > ├── cs:450000 > │ ├── cost > │ ├── frequency > │ └── power > ├── cs:625000 > │ ├── cost > │ ├── frequency > │ └── power > ├── cs:800000 > │ ├── cost > │ ├── frequency > │ └── power > └── cs:950000 > ├── cost > ├── frequency > └── power > > Signed-off-by: Quentin Perret <quentin.per...@arm.com> > > --- > > V2: removed check on return value of debugfs_create_* (Greg KH) > --- > kernel/power/energy_model.c | 57 +++++++++++++++++++++++++++++++++++++ > 1 file changed, 57 insertions(+)
Reviewed-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>