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[AMD Official Use Only - Internal Distribution Only]


We had entertained the idea of exposing the processes as sysfs nodes as you= proposed, but we had concerns about exposing process info in there, especi= ally since /proc already exists for that purpose.

I think if you were to follow that approach, we could have tools like top t= hat support exposing GPU engine usage.
From: Alex Deucher <alex= deucher@gmail.com>
Sent: Thursday, May 13, 2021 10:58 PM
To: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>; Nieto, Da= vid M <David.Nieto@amd.com>; Koenig, Christian <Christian.Koenig@a= md.com>
Cc: Intel Graphics Development <Intel-gfx@lists.freedesktop.org&g= t;; Maling list - DRI developers <dri-devel@lists.freedesktop.org>; D= aniel Vetter <daniel@ffwll.ch>
Subject: Re: [PATCH 0/7] Per client engine busyness
 
+ David, Christian

On Thu, May 13, 2021 at 12:41 PM Tvrtko Ursulin
<tvrtko.ursulin@linux.intel.com> wrote:
>
>
> Hi,
>
> On 13/05/2021 16:48, Alex Deucher wrote:
> > On Thu, May 13, 2021 at 7:00 AM Tvrtko Ursulin
> > <tvrtko.ursulin@linux.intel.com> wrote:
> >>
> >> From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
> >>
> >> Resurrect of the previosuly merged per client engine busyness= patches. In a
> >> nutshell it enables intel_gpu_top to be more top(1) like usef= ul and show not
> >> only physical GPU engine usage but per process view as well.<= br> > >>
> >> Example screen capture:
> >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~= ~~~~~~~~~~~~~~~~~~~
> >> intel-gpu-top -  906/ 955 MHz;    0% RC6;=   5.30 Watts;      933 irqs/s
> >>
> >>        IMC reads: &nb= sp;   4414 MiB/s
> >>       IMC writes:  &n= bsp;  3805 MiB/s
> >>
> >>          &n= bsp; ENGINE      BUSY     = ;            &n= bsp;            = ;        MI_SEMA MI_WAIT
> >>       Render/3D/0   9= 3.46% |=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i= =A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2i=A2n  |&nb= sp;     0%      0%
> >>         Blitter/0&nbs= p;   0.00% |         = ;            &n= bsp;            = ; |      0%      0%
> >>           V= ideo/0    0.00% |       &= nbsp;           &nbs= p;            &= nbsp;  |      0%     = ; 0%
> >>    VideoEnhance/0    0.00% |&nb= sp;            =             &nb= sp;         |   &nbs= p;  0%      0%
> >>
> >>    PID      &nbs= p;     NAME  Render/3D    &nbs= p; Blitter        Video   = ;   VideoEnhance
> >>   2733       neverbal= l |=A2i=A2i=A2i=A2i=A2i=A2i=A2m     ||   = ;         ||    = ;        ||     = ;       |
> >>   2047       &nb= sp;    Xorg |=A2i=A2i=A2i=A2o     &= nbsp;  ||          &= nbsp; ||            = ||            |
> >>   2737        gl= xgears |=A2i=A2l          ||&n= bsp;           || &n= bsp;          ||  &n= bsp;         |
> >>   2128       &nb= sp;   xfwm4 |        &nbs= p;   ||         &nbs= p;  ||          &nbs= p; ||            | > >>   2047       &nb= sp;    Xorg |        = ;    ||         = ;   ||          = ;  ||           = ; |
> >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~= ~~~~~~~~~~~~~~~~~~~
> >>
> >> Internally we track time spent on engines for each struct int= el_context, both
> >> for current and past contexts belonging to each open DRM file= .
> >>
> >> This can serve as a building block for several features from = the wanted list:
> >> smarter scheduler decisions, getrusage(2)-like per-GEM-contex= t functionality
> >> wanted by some customers, setrlimit(2) like controls, cgroups= controller,
> >> dynamic SSEU tuning, ...
> >>
> >> To enable userspace access to the tracked data, we expose tim= e spent on GPU per
> >> client and per engine class in sysfs with a hierarchy like th= e below:
> >>
> >>          # cd /s= ys/class/drm/card0/clients/
> >>          # tree<= br> > >>          .
> >>          =A2u=A2= w=A2w 7
> >>          =A2x&nb= sp;  =A2u=A2w=A2w busy
> >>          =A2x&nb= sp;  =A2x   =A2u=A2w=A2w 0
> >>          =A2x&nb= sp;  =A2x   =A2u=A2w=A2w 1
> >>          =A2x&nb= sp;  =A2x   =A2u=A2w=A2w 2
> >>          =A2x&nb= sp;  =A2x   =A2|=A2w=A2w 3
> >>          =A2x&nb= sp;  =A2u=A2w=A2w name
> >>          =A2x&nb= sp;  =A2|=A2w=A2w pid
> >>          =A2u=A2= w=A2w 8
> >>          =A2x&nb= sp;  =A2u=A2w=A2w busy
> >>          =A2x&nb= sp;  =A2x   =A2u=A2w=A2w 0
> >>          =A2x&nb= sp;  =A2x   =A2u=A2w=A2w 1
> >>          =A2x&nb= sp;  =A2x   =A2u=A2w=A2w 2
> >>          =A2x&nb= sp;  =A2x   =A2|=A2w=A2w 3
> >>          =A2x&nb= sp;  =A2u=A2w=A2w name
> >>          =A2x&nb= sp;  =A2|=A2w=A2w pid
> >>          =A2|=A2= w=A2w 9
> >>          &n= bsp;   =A2u=A2w=A2w busy
> >>          &n= bsp;   =A2x   =A2u=A2w=A2w 0
> >>          &n= bsp;   =A2x   =A2u=A2w=A2w 1
> >>          &n= bsp;   =A2x   =A2u=A2w=A2w 2
> >>          &n= bsp;   =A2x   =A2|=A2w=A2w 3
> >>          &n= bsp;   =A2u=A2w=A2w name
> >>          &n= bsp;   =A2|=A2w=A2w pid
> >>
> >> Files in 'busy' directories are numbered using the engine cla= ss ABI values and
> >> they contain accumulated nanoseconds each client spent on eng= ines of a
> >> respective class.
> >
> > We did something similar in amdgpu using the gpu scheduler. = We then
> > expose the data via fdinfo.  See
> > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fcgit.fr= eedesktop.org%2Fdrm%2Fdrm-misc%2Fcommit%2F%3Fid%3D1774baa64f9395fa884ea9ed4= 94bcb043f3b83f5&amp;data=3D04%7C01%7CDavid.Nieto%40amd.com%7C5e3c05578e= f14be3692508d9169d55bf%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C6375656= 87273144615%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ= BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3Dmt1EIL%2Fc9pHCXR%2FYSd%2= BTr1e64XHoeYcdQ2cYufJ%2FcYQ%3D&amp;reserved=3D0
> > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fcgit.fr= eedesktop.org%2Fdrm%2Fdrm-misc%2Fcommit%2F%3Fid%3D874442541133f78c78b6880b8= cc495bab5c61704&amp;data=3D04%7C01%7CDavid.Nieto%40amd.com%7C5e3c05578e= f14be3692508d9169d55bf%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C6375656= 87273144615%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ= BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=3D%2F3zMGw0LPTC1kG4NebTwUP= Tx7QCtEyw%2B4JToXDK5QXI%3D&amp;reserved=3D0
>
> Interesting!
>
> Is yours wall time or actual GPU time taking preemption and such into<= br> > account? Do you have some userspace tools parsing this data and how to=
> do you client discovery? Presumably there has to be a better way that<= br> > going through all open file descriptors?

Wall time.  It uses the fences in the scheduler to calculate engine time.  We have some python scripts to make it look pretty, but mainly<= br> just reading the files directly.  If you know the process, you can
look it up in procfs.

>
> Our implementation was merged in January but Daniel took it out recent= ly
> because he wanted to have discussion about a common vendor framework f= or
> this whole story on dri-devel. I think. +Daniel to comment.
>
> I couldn't find the patch you pasted on the mailing list to see if the= re
> was any such discussion around your version.

It was on the amd-gfx mailing list.

Alex

>
> Regards,
>
> Tvrtko
>
> >
> > Alex
> >
> >
> >>
> >> Tvrtko Ursulin (7):
> >>    drm/i915: Expose list of clients in sysfs > >>    drm/i915: Update client name on context cre= ate
> >>    drm/i915: Make GEM contexts track DRM clien= ts
> >>    drm/i915: Track runtime spent in closed and= unreachable GEM contexts
> >>    drm/i915: Track all user contexts per clien= t
> >>    drm/i915: Track context current active time=
> >>    drm/i915: Expose per-engine client busyness=
> >>
> >>   drivers/gpu/drm/i915/Makefile   &n= bsp;            = ; |   5 +-
> >>   drivers/gpu/drm/i915/gem/i915_gem_context.c =   |  61 ++-
> >>   .../gpu/drm/i915/gem/i915_gem_context_types.h |&n= bsp; 16 +-
> >>   drivers/gpu/drm/i915/gt/intel_context.c &nbs= p;     |  27 +-
> >>   drivers/gpu/drm/i915/gt/intel_context.h &nbs= p;     |  15 +-
> >>   drivers/gpu/drm/i915/gt/intel_context_types.h |&n= bsp; 24 +-
> >>   .../drm/i915/gt/intel_execlists_submission.c = ; |  23 +-
> >>   .../gpu/drm/i915/gt/intel_gt_clock_utils.c &= nbsp;  |   4 +
> >>   drivers/gpu/drm/i915/gt/intel_lrc.c  &n= bsp;        |  27 +-
> >>   drivers/gpu/drm/i915/gt/intel_lrc.h  &n= bsp;        |  24 ++
> >>   drivers/gpu/drm/i915/gt/selftest_lrc.c  = ;      |  10 +-
> >>   drivers/gpu/drm/i915/i915_drm_client.c  = ;      | 365 ++++++++++++++++++
> >>   drivers/gpu/drm/i915/i915_drm_client.h  = ;      | 123 ++++++
> >>   drivers/gpu/drm/i915/i915_drv.c   =             | &= nbsp; 6 +
> >>   drivers/gpu/drm/i915/i915_drv.h   =             | &= nbsp; 5 +
> >>   drivers/gpu/drm/i915/i915_gem.c   =             |  = 21 +-
> >>   drivers/gpu/drm/i915/i915_gpu_error.c  =        |  31 +-
> >>   drivers/gpu/drm/i915/i915_gpu_error.h  =        |   2 +-
> >>   drivers/gpu/drm/i915/i915_sysfs.c  &nbs= p;          |   8 +<= br> > >>   19 files changed, 716 insertions(+), 81 deletions= (-)
> >>   create mode 100644 drivers/gpu/drm/i915/i915_drm_= client.c
> >>   create mode 100644 drivers/gpu/drm/i915/i915_drm_= client.h
> >>
> >> --
> >> 2.30.2
> >>
--_000_BYAPR12MB2840AA68BCAEBD9279C6184FF4509BYAPR12MB2840namp_--