5-post thread, 2 JPGs, 2023-08-03. SPC: 8-deep swap all aliasing same
BO (image) fixes Game Mode crash with external display. Pipelined
load: 2 ms to black screen; 460 ms to allocate 4 GiB GTT video RAM;
558 ms to copy 256 MiB cart from page cache to USWC (page faults),
all in parallel. Cold-launch worst case (cache cleared): 1.5 sec
to read 256 MiB from stock SSD; no compile after this, 'literally
in game at this point.' 3-thread load: (1.) X11 then spin present/
keyboard, (2.) AMDgpu device open + SDMA after CART read then
dispatch, (3.) CART disk->USWC GTT read(). SSD needs linear reads
to be fast so don't manually thread read(). Sibling to SPC project
intro (1687257354490818561).
