On Tuesday 22 Jan 2019 at 19:41:36 (+0100), Greg KH wrote: > 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>
Thanks ! Quentin
