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metal: make post_commit_margin configurable

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This commit is contained in:
Julian Orth 2024-09-14 13:56:22 +02:00
parent 76b0f2f734
commit 02ece60909
24 changed files with 224 additions and 55 deletions
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27
src/backends/metal/present.rs
View file

@ -23,11 +23,7 @@ use {
},
},
},
std::{
env,
rc::{Rc, Weak},
sync::LazyLock,
},
std::rc::{Rc, Weak},
uapi::c,
};
@ -85,19 +81,9 @@ enum CursorProgramming {
}
pub const DEFAULT_PRE_COMMIT_MARGIN: u64 = 16_000_000; // 16ms
pub const MIN_POST_COMMIT_MARGIN: u64 = 1_500_000; // 1.5ms
pub const MAX_POST_COMMIT_MARGIN: u64 = 16_000_000; // 16ms
pub const DEFAULT_POST_COMMIT_MARGIN: u64 = MIN_POST_COMMIT_MARGIN;
pub const DEFAULT_POST_COMMIT_MARGIN: u64 = 1_500_000; // 1.5ms;
pub const POST_COMMIT_MARGIN_DELTA: u64 = 500_000; // 500us
static NO_FRAME_SCHEDULING: LazyLock<bool> = LazyLock::new(|| {
let res = env::var("JAY_NO_FRAME_SCHEDULING").ok().as_deref() == Some("1");
if res {
log::warn!("Frame scheduling is disabled.");
}
res
});
impl MetalConnector {
pub fn schedule_present(&self) {
self.present_trigger.trigger();
@ -113,10 +99,13 @@ impl MetalConnector {
}
let mut expected_sequence = self.sequence.get() + 1;
let mut start = Time::now_unchecked();
let use_frame_scheduling = !self.try_async_flip() && !*NO_FRAME_SCHEDULING;
let use_frame_scheduling = !self.try_async_flip();
if use_frame_scheduling {
let margin = self.pre_commit_margin.get() + self.post_commit_margin.get();
let next_present = self.next_flip_nsec.get().saturating_sub(margin);
let next_present = self
.next_flip_nsec
.get()
.saturating_sub(self.pre_commit_margin.get())
.saturating_sub(self.post_commit_margin.get());
if start.nsec() < next_present {
self.state.ring.timeout(next_present).await.unwrap();
start = Time::now_unchecked();

76
src/backends/metal/video.rs
View file

@ -10,8 +10,7 @@ use {
backends::metal::{
present::{
DirectScanoutCache, PresentFb, DEFAULT_POST_COMMIT_MARGIN,
DEFAULT_PRE_COMMIT_MARGIN, MAX_POST_COMMIT_MARGIN, MIN_POST_COMMIT_MARGIN,
POST_COMMIT_MARGIN_DELTA,
DEFAULT_PRE_COMMIT_MARGIN, POST_COMMIT_MARGIN_DELTA,
},
MetalBackend, MetalError,
},
@ -27,6 +26,7 @@ use {
wp_presentation_feedback::{KIND_HW_COMPLETION, KIND_VSYNC, KIND_ZERO_COPY},
},
state::State,
tree::OutputNode,
udev::UdevDevice,
utils::{
asyncevent::AsyncEvent, bitflags::BitflagsExt, cell_ext::CellExt, clonecell::CloneCell,
@ -108,6 +108,7 @@ pub struct MetalDrmDevice {
pub leases: CopyHashMap<MetalLeaseId, MetalLeaseData>,
pub leases_to_break: CopyHashMap<MetalLeaseId, MetalLeaseData>,
pub paused: Cell<bool>,
pub min_post_commit_margin: Cell<u64>,
}
impl Debug for MetalDrmDevice {
@ -279,6 +280,19 @@ impl BackendDrmDevice for MetalDrmDevice {
});
lessee.created(lease);
}
fn set_flip_margin(&self, margin: u64) {
self.min_post_commit_margin.set(margin);
if let Some(dd) = self.backend.device_holder.drm_devices.get(&self.devnum) {
for c in dd.connectors.lock().values() {
c.post_commit_margin.set(margin);
c.post_commit_margin_decay.reset(margin);
if let Some(output) = self.backend.state.root.outputs.get(&c.connector_id) {
output.flip_margin_ns.set(Some(margin));
}
}
}
}
}
pub struct HandleEvents {
@ -1067,8 +1081,8 @@ fn create_connector(
expected_sequence: Default::default(),
pre_commit_margin_decay: GeometricDecay::new(0.5, DEFAULT_PRE_COMMIT_MARGIN),
pre_commit_margin: Cell::new(DEFAULT_PRE_COMMIT_MARGIN),
post_commit_margin_decay: GeometricDecay::new(0.1, DEFAULT_POST_COMMIT_MARGIN),
post_commit_margin: Cell::new(DEFAULT_POST_COMMIT_MARGIN),
post_commit_margin_decay: GeometricDecay::new(0.1, dev.min_post_commit_margin.get()),
post_commit_margin: Cell::new(dev.min_post_commit_margin.get()),
vblank_miss_sec: Cell::new(0),
vblank_miss_this_sec: Default::default(),
presentation_is_sync: Cell::new(false),
@ -1750,6 +1764,7 @@ impl MetalBackend {
leases: Default::default(),
leases_to_break: Default::default(),
paused: Cell::new(false),
min_post_commit_margin: Cell::new(DEFAULT_POST_COMMIT_MARGIN),
});
let (connectors, futures) = get_connectors(self, &dev, &resources.connectors)?;
@ -1943,24 +1958,11 @@ impl MetalBackend {
if let Some(fb) = connector.next_framebuffer.take() {
*connector.active_framebuffer.borrow_mut() = Some(fb);
}
let dd = connector.display.borrow();
let global = self.state.root.outputs.get(&connector.connector_id);
if let Some(expected) = connector.expected_sequence.take() {
if connector.vblank_miss_sec.replace(tv_sec) != tv_sec {
let n_missed = connector.vblank_miss_this_sec.replace(0);
if n_missed > 0 {
log::debug!("{}: Missed {n_missed} page flips", connector.kernel_id());
let new_margin = (connector.post_commit_margin.get()
+ POST_COMMIT_MARGIN_DELTA)
.min(MAX_POST_COMMIT_MARGIN);
connector.post_commit_margin_decay.reset(new_margin);
connector.post_commit_margin.set(new_margin);
} else {
connector
.post_commit_margin_decay
.add(MIN_POST_COMMIT_MARGIN);
connector
.post_commit_margin
.set(connector.post_commit_margin_decay.get());
}
self.update_post_commit_margin(dev, &connector, &dd, global.as_deref());
}
let actual = connector.sequence.get();
if expected < actual {
@ -1973,12 +1975,10 @@ impl MetalBackend {
{
connector.schedule_present();
}
let dd = connector.display.borrow_mut();
connector
.next_flip_nsec
.set(tv_sec as u64 * 1_000_000_000 + tv_usec as u64 * 1000 + dd.refresh as u64);
{
let global = self.state.root.outputs.get(&connector.connector_id);
let mut flags = KIND_HW_COMPLETION;
if connector.presentation_is_sync.get() {
flags |= KIND_VSYNC;
@ -2002,6 +2002,38 @@ impl MetalBackend {
}
}
fn update_post_commit_margin(
&self,
dev: &MetalDrmDeviceData,
connector: &MetalConnector,
dd: &ConnectorDisplayData,
global: Option<&OutputNode>,
) {
let n_missed = connector.vblank_miss_this_sec.replace(0);
let old_margin = connector.post_commit_margin.get();
let new_margin = if n_missed > 0 {
log::debug!("{}: Missed {n_missed} page flips", connector.kernel_id());
let refresh = dd.refresh as u64;
if old_margin >= refresh {
return;
}
let new_margin = (old_margin + POST_COMMIT_MARGIN_DELTA).min(refresh);
connector.post_commit_margin_decay.reset(new_margin);
new_margin
} else {
let min_margin = dev.dev.min_post_commit_margin.get();
if min_margin >= connector.post_commit_margin.get() {
return;
}
connector.post_commit_margin_decay.add(min_margin);
connector.post_commit_margin_decay.get()
};
connector.post_commit_margin.set(new_margin);
if let Some(global) = &global {
global.flip_margin_ns.set(Some(new_margin));
}
}
fn reset_planes(&self, dev: &MetalDrmDeviceData, changes: &mut Change, preserve: &Preserve) {
for plane in dev.dev.planes.values() {
if preserve.planes.contains(&plane.id) {