On Fri, Mar 23, 2018 at 02:15:38PM +0200, Joonas Lahtinen wrote: > Quoting Matt Roper (2018-03-17 02:08:57) > > This is the fourth iteration of the work previously posted here: > > (v1) https://lists.freedesktop.org/archives/intel-gfx/2018-January/153156.html > > (v2) https://www.mail-archive.com/dri-devel@xxxxxxxxxxxxxxxxxxxxx/msg208170.html > > (v3) https://lists.freedesktop.org/archives/intel-gfx/2018-March/157928.html > > > > The high level goal of this work is to allow non-cgroup-controller parts > > of the kernel (e.g., device drivers) to register their own private > > policy data for specific cgroups. That mechanism is then made use of in > > the i915 graphics driver to allow GPU priority to be assigned according > > to the cgroup membership of the owning process. Please see the v1 cover > > letter linked above for a more in-depth explanation and justification. > > Hi Matt, > > For cross-subsystem changes such as this, it makes sense to Cc all > relevant maintainers, especially if there have been previous comments to > earlier revisions. > > Please, do include and keep a reference to the userspace portion of the > changes when you suggest new uAPI to be added. At least I have some trouble > trying to track down the relevant interface consumer here. > > I'm unsure how much sense it makes to commence with detailed i915 review > if we will be blocked by lack of userspace after that? I'm assuming > you've read through [1] already. Hi Joonas, I've sent the userspace code out a few times, but it looks like I forgot to include a copy with v4/v4.5. Here's the version I provided with v3: https://lists.freedesktop.org/archives/intel-gfx/2018-March/157935.html Usually we don't consider things like i-g-t to be sufficient userspace consumers because we need a real-world consumer rather than a "toy" userspace. However in this case, the i-g-t tool, although very simple, is really the only userspace consumer I expect there to ever be. Ultimately the true consumer of this cgroups work are bash scripts, sysv init scripts, systemd recipes, etc. that just need a very simple tool to assign the specific values that make sense on a given system. There's no expectation that graphics clients or display servers would ever need to make use of these interfaces. Matt > > Regards, Joonas > > [1] https://01.org/linuxgraphics/gfx-docs/drm/gpu/drm-uapi.html#open-source-userspace-requirements -- Matt Roper Graphics Software Engineer IoTG Platform Enabling & Development Intel Corporation (916) 356-2795 -- To unsubscribe from this list: send the line "unsubscribe cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
