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metal: commit 1.5ms before the next page flip

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This commit is contained in:
Julian Orth 2024-09-10 14:28:06 +02:00
parent a37ce1acda
commit 87d60d267e
4 changed files with 105 additions and 9 deletions
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48
src/backends/metal/video.rs
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@ -8,7 +8,11 @@ use {
HardwareCursorUpdate, Mode, MonitorInfo,
},
backends::metal::{
present::{DirectScanoutCache, PresentFb},
present::{
DirectScanoutCache, PresentFb, DEFAULT_POST_COMMIT_MARGIN,
DEFAULT_PRE_COMMIT_MARGIN, MAX_POST_COMMIT_MARGIN, MIN_POST_COMMIT_MARGIN,
POST_COMMIT_MARGIN_DELTA,
},
MetalBackend, MetalError,
},
drm_feedback::DrmFeedback,
@ -27,8 +31,8 @@ use {
udev::UdevDevice,
utils::{
asyncevent::AsyncEvent, bitflags::BitflagsExt, cell_ext::CellExt, clonecell::CloneCell,
copyhashmap::CopyHashMap, errorfmt::ErrorFmt, numcell::NumCell, on_change::OnChange,
opaque_cell::OpaqueCell, oserror::OsError,
copyhashmap::CopyHashMap, errorfmt::ErrorFmt, geometric_decay::GeometricDecay,
numcell::NumCell, on_change::OnChange, opaque_cell::OpaqueCell, oserror::OsError,
},
video::{
dmabuf::DmaBufId,
@ -464,6 +468,13 @@ pub struct MetalConnector {
pub version: NumCell<u64>,
pub sequence: Cell<u64>,
pub expected_sequence: Cell<Option<u64>>,
pub pre_commit_margin: Cell<u64>,
pub pre_commit_margin_decay: GeometricDecay,
pub post_commit_margin: Cell<u64>,
pub post_commit_margin_decay: GeometricDecay,
pub vblank_miss_sec: Cell<u32>,
pub vblank_miss_this_sec: NumCell<u32>,
}
impl Debug for MetalConnector {
@ -1055,6 +1066,13 @@ fn create_connector(
try_switch_format: Cell::new(false),
version: Default::default(),
sequence: Default::default(),
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),
vblank_miss_sec: Cell::new(0),
vblank_miss_this_sec: Default::default(),
});
let futures = ConnectorFutures {
_present: backend
@ -1924,6 +1942,30 @@ impl MetalBackend {
if let Some(fb) = connector.next_framebuffer.take() {
*connector.active_framebuffer.borrow_mut() = Some(fb);
}
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());
}
}
let actual = connector.sequence.get();
if expected < actual {
connector.vblank_miss_this_sec.fetch_add(1);
}
}
if connector.has_damage.is_not_zero()
|| connector.cursor_damage.get()
|| connector.cursor_changed.get()