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compositing: Add memory reporter for WebRender. (#36557)

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This adds a memory reporter for WebRender's memory usage. I seeded it
with a couple entries that looked reasonable based on
https://searchfox.org/mozilla-central/rev/2c71f1e9b5947612abdc16b64008162c58c1b9d3/gfx/thebes/gfxPlatform.cpp#722-738.

Testing: Verified that new numbers appear in about:memory for servo.org.
The new images category is surprisingly large (40mb).

Signed-off-by: Josh Matthews <josh@joshmatthews.net>
This commit is contained in:
Josh Matthews 2025-04-16 09:14:04 -04:00 • committed by GitHub
parent afe98e9e1e
commit af000d6c91
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9 changed files with 98 additions and 8 deletions
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37
components/compositing/compositor.rs
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@ -34,8 +34,9 @@ use ipc_channel::ipc::{self, IpcSharedMemory};
use libc::c_void;
use log::{debug, info, trace, warn};
use pixels::{CorsStatus, Image, ImageFrame, PixelFormat};
use profile_traits::mem::{ProcessReports, ProfilerRegistration, Report, ReportKind};
use profile_traits::time::{self as profile_time, ProfilerCategory};
use profile_traits::time_profile;
use profile_traits::{path, time_profile};
use servo_config::opts;
use servo_geometry::DeviceIndependentPixel;
use style_traits::CSSPixel;
@ -147,6 +148,10 @@ pub struct IOCompositor {
/// The [`Instant`] of the last animation tick, used to avoid flooding the Constellation and
/// ScriptThread with a deluge of animation ticks.
last_animation_tick: Instant,
/// A handle to the memory profiler which will automatically unregister
/// when it's dropped.
_mem_profiler_registration: ProfilerRegistration,
}
/// Why we need to be repainted. This is used for debugging.
@ -391,6 +396,11 @@ impl ServoRenderer {
impl IOCompositor {
pub fn new(state: InitialCompositorState, convert_mouse_to_touch: bool) -> Self {
let registration = state.mem_profiler_chan.prepare_memory_reporting(
"compositor".into(),
state.sender.clone(),
CompositorMsg::CollectMemoryReport,
);
let compositor = IOCompositor {
global: Rc::new(RefCell::new(ServoRenderer {
shutdown_state: state.shutdown_state,
@ -414,6 +424,7 @@ impl IOCompositor {
rendering_context: state.rendering_context,
pending_frames: 0,
last_animation_tick: Instant::now(),
_mem_profiler_registration: registration,
};
{
@ -496,6 +507,30 @@ impl IOCompositor {
}
match msg {
CompositorMsg::CollectMemoryReport(sender) => {
let ops =
wr_malloc_size_of::MallocSizeOfOps::new(servo_allocator::usable_size, None);
let report = self.global.borrow().webrender_api.report_memory(ops);
let reports = vec![
Report {
path: path!["webrender", "fonts"],
kind: ReportKind::ExplicitJemallocHeapSize,
size: report.fonts,
},
Report {
path: path!["webrender", "images"],
kind: ReportKind::ExplicitJemallocHeapSize,
size: report.images,
},
Report {
path: path!["webrender", "display-list"],
kind: ReportKind::ExplicitJemallocHeapSize,
size: report.display_list,
},
];
sender.send(ProcessReports::new(reports));
},
CompositorMsg::ChangeRunningAnimationsState(
webview_id,
pipeline_id,