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Profiler: Cache the timeline histograms instead of recomputing on paint

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There was an aggressive amount of work happening on every paint. :^)
This commit is contained in:
Andreas Kling 2021-06-27 12:03:12 +02:00
parent f4090d46de
commit dff3439ad0
2 changed files with 60 additions and 35 deletions
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77
Userland/DevTools/Profiler/TimelineTrack.cpp
View file

@ -1,11 +1,10 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "TimelineTrack.h"
#include "Histogram.h"
#include "Profile.h"
#include "TimelineView.h"
#include <LibGUI/Painter.h>
@ -55,44 +54,24 @@ void TimelineTrack::paint_event(GUI::PaintEvent& event)
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
const u64 start_of_trace = m_profile.first_timestamp();
const u64 end_of_trace = start_of_trace + m_profile.length_in_ms();
u64 const start_of_trace = m_profile.first_timestamp();
u64 const end_of_trace = start_of_trace + m_profile.length_in_ms();
const auto clamp_timestamp = [start_of_trace, end_of_trace](u64 timestamp) -> u64 {
auto const clamp_timestamp = [start_of_trace, end_of_trace](u64 timestamp) -> u64 {
return min(end_of_trace, max(timestamp, start_of_trace));
};
float column_width = (float)frame_inner_rect().width() / (float)m_profile.length_in_ms();
size_t columns = frame_inner_rect().width() / column_width;
Histogram kernel_histogram { start_of_trace, end_of_trace, columns };
Histogram usermode_histogram { start_of_trace, end_of_trace, columns };
auto bucket_count = kernel_histogram.size();
recompute_histograms_if_needed({ start_of_trace, end_of_trace, columns });
for (auto& event : m_profile.events()) {
if (event.pid != m_process.pid)
continue;
float frame_height = (float)frame_inner_rect().height() / (float)m_max_value;
if (!m_process.valid_at(event.serial))
continue;
auto& histogram = event.in_kernel ? kernel_histogram : usermode_histogram;
histogram.insert(clamp_timestamp(event.timestamp), 1 + event.lost_samples);
}
decltype(kernel_histogram.at(0)) max_value = 0;
for (size_t bucket = 0; bucket < bucket_count; bucket++) {
auto value = kernel_histogram.at(bucket) + usermode_histogram.at(bucket);
if (value > max_value)
max_value = value;
}
float frame_height = (float)frame_inner_rect().height() / (float)max_value;
for (size_t bucket = 0; bucket < bucket_count; bucket++) {
auto kernel_value = kernel_histogram.at(bucket);
auto usermode_value = usermode_histogram.at(bucket);
if (kernel_value + usermode_value == 0)
for (size_t bucket = 0; bucket < m_kernel_histogram->size(); bucket++) {
auto kernel_value = m_kernel_histogram->at(bucket);
auto user_value = m_user_histogram->at(bucket);
if (kernel_value + user_value == 0)
continue;
auto t = bucket;
@ -101,11 +80,11 @@ void TimelineTrack::paint_event(GUI::PaintEvent& event)
int cw = max(1, (int)column_width);
int kernel_column_height = frame_inner_rect().height() - (int)((float)kernel_value * frame_height);
int usermode_column_height = frame_inner_rect().height() - (int)((float)(kernel_value + usermode_value) * frame_height);
int user_column_height = frame_inner_rect().height() - (int)((float)(kernel_value + user_value) * frame_height);
constexpr auto kernel_color = Color::from_rgb(0xc25e5a);
constexpr auto usermode_color = Color::from_rgb(0x5a65c2);
painter.fill_rect({ x, frame_thickness() + usermode_column_height, cw, height() - frame_thickness() * 2 }, usermode_color);
constexpr auto user_color = Color::from_rgb(0x5a65c2);
painter.fill_rect({ x, frame_thickness() + user_column_height, cw, height() - frame_thickness() * 2 }, user_color);
painter.fill_rect({ x, frame_thickness() + kernel_column_height, cw, height() - frame_thickness() * 2 }, kernel_color);
}
@ -120,4 +99,34 @@ void TimelineTrack::paint_event(GUI::PaintEvent& event)
painter.fill_rect({ select_hover_x, frame_thickness(), 1, height() - frame_thickness() * 2 }, Color::NamedColor::Black);
}
void TimelineTrack::recompute_histograms_if_needed(HistogramInputs const& inputs)
{
if (m_cached_histogram_inputs == inputs && m_kernel_histogram.has_value())
return;
auto const clamp_timestamp = [&inputs](u64 timestamp) -> u64 {
return min(inputs.end, max(timestamp, inputs.start));
};
m_kernel_histogram = Histogram { inputs.start, inputs.end, inputs.columns };
m_user_histogram = Histogram { inputs.start, inputs.end, inputs.columns };
for (auto& event : m_profile.events()) {
if (event.pid != m_process.pid)
continue;
if (!m_process.valid_at(event.serial))
continue;
auto& histogram = event.in_kernel ? *m_kernel_histogram : *m_user_histogram;
histogram.insert(clamp_timestamp(event.timestamp), 1 + event.lost_samples);
}
for (size_t bucket = 0; bucket < m_kernel_histogram->size(); bucket++) {
auto value = m_kernel_histogram->at(bucket) + m_user_histogram->at(bucket);
if (value > m_max_value)
m_max_value = value;
}
}
}

18
Userland/DevTools/Profiler/TimelineTrack.h
View file

@ -1,11 +1,12 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include "Histogram.h"
#include <LibGUI/Frame.h>
namespace Profiler {
@ -26,11 +27,26 @@ private:
virtual void event(Core::Event&) override;
virtual void paint_event(GUI::PaintEvent&) override;
struct HistogramInputs {
bool operator==(HistogramInputs const&) const = default;
u64 start { 0 };
u64 end { 0 };
size_t columns { 0 };
};
void recompute_histograms_if_needed(HistogramInputs const&);
explicit TimelineTrack(TimelineView const&, Profile const&, Process const&);
TimelineView const& m_view;
Profile const& m_profile;
Process const& m_process;
HistogramInputs m_cached_histogram_inputs;
Optional<Histogram<u64>> m_kernel_histogram;
Optional<Histogram<u64>> m_user_histogram;
decltype(m_kernel_histogram->at(0)) m_max_value { 0 };
};
}