Created stand alone tool for sampling gfx data on regular
intervals. Tool has inner loop that performs sampling every N
useconds. Press any key to end sampling. Results will be dumped
when intel_monitor exits.
First application of intel_monitor will be to collect eu stall
data. Perhaps more applications can be added at a later date.
How to use:
0. Set sysctl dev.xe.observation_paranoid=0
1. Clean shader cache and launch gfx INTEL_DEBUG=shaders-lineno.
Redirect stderr to asm.txt.
2. When gfx app ready to monitor, begin capturing eustall data by
launching `intel_monitor -e > eustall.csv` in separate console.
3 When done collected, close intel_monitor by pressing any key.
4. Correlate eustall data in eustall.csv with shader instructions in
asm.txt by matching instruction offsets. Use data to determine which
instructions are stalling and why.
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30142>
