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[scheduler, dma, maxwell] Reduce CPU stalls in the GPU command processing pipeline through multiple targeted optimizations (#3296)

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- Scheduler: Reduced lock scope to allow parallel command preparation across channels
- DmaPusher: Added command prefetching (16-command lookahead) to improve cache hit rate
- Maxwell3D: Pre-allocated macro parameter vectors to eliminate dynamic allocations and unrolls dirty register tracking loop for better cache locality
- MacroEngine: Added last-executed macro cache to skip hash table lookups on hot path

Co-authored-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3296
Reviewed-by: Maufeat <sahyno1996@gmail.com>
Reviewed-by: DraVee <dravee@eden-emu.dev>
Co-authored-by: CamilleLaVey <camillelavey99@gmail.com>
Co-committed-by: CamilleLaVey <camillelavey99@gmail.com>
This commit is contained in:
CamilleLaVey 2026-01-18 03:45:18 +01:00 • committed by crueter
parent 6ec6ca7c37
commit 51cc1bc6be
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4 changed files with 100 additions and 30 deletions
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15
src/video_core/control/scheduler.cpp
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@ -17,11 +17,16 @@ Scheduler::Scheduler(GPU& gpu_) : gpu{gpu_} {}
Scheduler::~Scheduler() = default;
void Scheduler::Push(s32 channel, CommandList&& entries) {
std::unique_lock lk(scheduling_guard);
auto it = channels.find(channel);
ASSERT(it != channels.end());
auto& channel_state = it->second;
gpu.BindChannel(channel_state->bind_id);
std::shared_ptr<ChannelState> channel_state;
{
std::unique_lock lk(scheduling_guard);
auto it = channels.find(channel);
ASSERT(it != channels.end());
channel_state = it->second;
gpu.BindChannel(channel_state->bind_id);
}
// Process commands outside the lock to reduce contention.
// Multiple channels can prepare their commands in parallel.
channel_state->dma_pusher->Push(std::move(entries));
channel_state->dma_pusher->DispatchCalls();
}