uftrace for chromium
1. Download depot_tools
Chromium uses a package of scripts called depot_tools to manage checkouts and code reviews.
The depot_tools package includes gclient, gcl, git-cl, repo, and others. Chromium uses a package of scripts called depot_tools to manage checkouts and code reviews.
# download depot_tools
$ git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
# environment setup for depot_tools
$ export PATH=`pwd`/depot_tools:$PATH
2. Download chromium
First, create a directory chromium.
$ mkdir chromium && cd chromium
Then, create .gclient file in the current directory as follows:
solutions = [
{
"url": "https://chromium.googlesource.com/chromium/src.git",
"managed": False,
"name": "src",
"custom_deps": {},
},
]Do (shallow) git clone for chromium source code.
$ git clone --depth=1 https://chromium.googlesource.com/chromium/src.git -b 73.0.3676.0
$ cd src
Then, download third party modules.
$ gclient sync --shallow
3. Change build scripts for -pg build support
The following use_uftrace.diff file contains some changes to apply -pg build for uftrace.
diff --git a/build/config/compiler/BUILD.gn b/build/config/compiler/BUILD.gn
index 54ce77b..204e721 100644
--- a/build/config/compiler/BUILD.gn
+++ b/build/config/compiler/BUILD.gn
@@ -762,6 +762,10 @@ config("compiler") {
asmflags += cflags
asmflags += cflags_c
}
+
+ if (use_uftrace) {
+ cflags += [ "-g", "-pg", "-fno-omit-frame-pointer" ]
+ }
}
# This provides the basic options to select the target CPU and ABI.
diff --git a/build/config/compiler/compiler.gni b/build/config/compiler/compiler.gni
index 18a7f08..ca00a68 100644
--- a/build/config/compiler/compiler.gni
+++ b/build/config/compiler/compiler.gni
@@ -74,6 +74,9 @@ declare_args() {
# It's currently not possible to collect AFDO profiles on anything but
# x86{,_64}.
using_mismatched_sample_profile = current_cpu != "x64" && current_cpu != "x86"
+
+ # Enables -g -pg -fno-omit-frame-pointer for uftrace
+ use_uftrace = false
}
assert(!is_cfi || use_thin_lto, "CFI requires ThinLTO")
diff --git a/third_party/ffmpeg/BUILD.gn b/third_party/ffmpeg/BUILD.gn
index fd79bc4..4a3eaae 100755
--- a/third_party/ffmpeg/BUILD.gn
+++ b/third_party/ffmpeg/BUILD.gn
@@ -7,6 +7,7 @@ import("ffmpeg_generated.gni")
import("//build/buildflag_header.gni")
import("//build/config/sanitizers/sanitizers.gni")
+import("//build/config/compiler/compiler.gni")
# Path to platform configuration files.
platform_config_root =
@@ -265,6 +266,10 @@ target(link_target_type, "ffmpeg_internal") {
"-Wno-deprecated-declarations",
]
+ if (use_uftrace) {
+ cflags -= [ "-fomit-frame-pointer" ]
+ }
+
if (!is_clang) {
# gcc doesn't have flags for specific warnings, so disable them
# all.
diff --git a/third_party/swiftshader/BUILD.gn b/third_party/swiftshader/BUILD.gn
index 56c78ce..54933c0 100644
--- a/third_party/swiftshader/BUILD.gn
+++ b/third_party/swiftshader/BUILD.gn
@@ -76,6 +76,10 @@ config("swiftshader_config") {
"-Os",
]
+ if (use_uftrace) {
+ cflags -= [ "-fomit-frame-pointer" ]
+ }
+
defines += [
"ANGLE_DISABLE_TRACE",
"NDEBUG",Since those changes have to be made across multiple different repositories, it has to be applied as follows:
$ patch -p1 < use_uftrace.diff
patching file build/config/compiler/BUILD.gn
patching file build/config/compiler/compiler.gni
patching file third_party/ffmpeg/BUILD.gn
patching file third_party/swiftshader/BUILD.gn
4. Install build dependencies
The chrome requires many other external packages to be installed. So the following command installs them.
$ sudo ./build/install-build-deps.sh
5. Build for chrome
$ gn gen out/Release.pg.g "--args=enable_nacl=false is_component_build=false is_debug=false use_jumbo_build=true symbol_level=2 use_uftrace=true"
$ ninja -C out/Release.pg.g chrome
$ cd out/Release.pg.g
$ nm ./chrome | grep mcount
U mcount
6. Tracing chrome with uftrace
The following command records a simple chrome execution in headless mode.
$ uftrace record -t 5ms --no-libcall ./chrome --no-sandbox --headless https://www.google.com
7. TUI output
7.1. Session List
Chrome launches many processes and their memory maps are different. To distinguish those, uftrace provides session window when it has multiple sessions as follows:
$ uftrace tui -t 30ms
Key uftrace command
G call Graph for session #1: chrome
call Graph for session #2: chrome
call Graph for session #3: chrome
R Report functions
I uftrace Info
h Help message
q quit
7.2. Browser Process
TOTAL TIME : FUNCTION
13.048 m : (1) chrome
1.032 m : ├─(1) main
1.032 m : │ (1) ChromeMain
1.032 m : │ (1) headless::HeadlessShellMain
1.032 m : │ (1) headless::HeadlessShellMain
1.032 m : │ (1) headless::HeadlessBrowserMain
1.032 m : │ (1) headless::_GLOBAL__N_1::RunContentMain
1.032 m : │ (1) content::ContentMain
1.032 m : │ (1) service_manager::Main
45.596 s : │ ├▶(1) content::ContentServiceManagerMainDelegate::Initialize
: │ │
46.730 s : │ └─(1) content::ContentServiceManagerMainDelegate::RunEmbedderProcess
46.730 s : │ (1) content::ContentMainRunnerImpl::Run
46.730 s : │ (1) content::ContentMainRunnerImpl::RunServiceManager
46.691 s : │ (1) headless::HeadlessContentMainDelegate::RunProcess
244.923 ms : │ ├▶(1) content::BrowserMainRunnerImpl::Initialize
: │ │
46.411 s : │ ├─(1) content::BrowserMainRunnerImpl::Run
46.411 s : │ │ (1) content::BrowserMainLoop::RunMainMessageLoopParts
46.411 s : │ │ (1) content::BrowserMainLoop::MainMessageLoopRun
46.411 s : │ │ (1) base::RunLoop::Run
46.411 s : │ │ (1) base::MessageLoopImpl::Run
46.411 s : │ │ (1) base::MessagePumpGlib::Run
71.332 ms : │ │ ├▶(1) base::MessageLoopImpl::DoWork
: │ │ │
45.829 s : │ │ └─(34) g_main_context_iteration
5.630 s : │ │ ├─(32) linux:schedule
: │ │ │
40.151 s : │ │ └─(1) base::_GLOBAL__N_1::WorkSourceDispatch
40.151 s : │ │ (1) base::MessageLoopImpl::DoWork
40.151 s : │ │ (1) base::MessageLoopImpl::DoWork
40.151 s : │ │ (1) base::MessageLoopImpl::RunTask
40.151 s : │ │ (1) base::debug::TaskAnnotator::RunTask
40.151 s : │ │ (1) base::internal::Invoker::RunOnce
40.151 s : │ │ (1) headless::HeadlessDevToolsClientImpl::DispatchEventTask
40.151 s : │ │ (1) base::internal::Invoker::Run
40.151 s : │ │ (1) headless::page::Domain::DispatchLoadEventFiredEvent
40.151 s : │ │ (1) headless::HeadlessShell::OnLoadEventFired
40.151 s : │ │ (1) headless::HeadlessShell::OnPageReady
40.151 s : │ │ ▶(1) headless::HeadlessShell::Shutdown
7.3. Renderer Process
TOTAL TIME : FUNCTION
1.030 m : (1) chrome
47.364 s : ├▶(1) main
: │
6.234 s : ├─(1) content::RendererMain
98.462 ms : │ ├▶(1) content::RenderThreadImpl::RenderThreadImpl
: │ │
6.124 s : │ └─(1) base::RunLoop::Run
6.124 s : │ (1) base::MessageLoopImpl::Run
6.124 s : │ (1) base::MessagePumpDefault::Run
4.459 s : │ ├─(13) base::MessageLoopImpl::DoWork
4.459 s : │ │ (13) base::MessageLoopImpl::DoWork
4.459 s : │ │ (13) base::MessageLoopImpl::RunTask
4.459 s : │ │ (13) base::debug::TaskAnnotator::RunTask
4.459 s : │ │ (13) base::internal::Invoker::Run
4.459 s : │ │ (13) base::sequence_manager::internal::ThreadControllerImpl::DoWork
4.344 s : │ │ (12) base::debug::TaskAnnotator::RunTask
1.953 s : │ │ ├─(6) base::internal::Invoker::Run
65.726 ms : │ │ │ ├▶(1) IPC::_GLOBAL__N_1::ChannelAssociatedGroupController::AcceptOnProxyThread
: │ │ │ │
1.888 s : │ │ │ └─(5) blink::TaskHandle::Runner::Run
1.888 s : │ │ │ (5) base::internal::Invoker::RunOnce
1.888 s : │ │ │ (5) blink::HTMLParserScheduler::ContinueParsing
1.888 s : │ │ │ (5) blink::HTMLDocumentParser::PumpPendingSpeculations
1.803 s : │ │ │ (6) blink::HTMLDocumentParser::ProcessTokenizedChunkFromBackgroundParser
1.667 s : │ │ │ ├─(4) blink::HTMLParserScriptRunner::ProcessScriptElement
1.667 s : │ │ │ │ (4) blink::HTMLParserScriptRunner::ProcessScriptElementInternal
1.667 s : │ │ │ │ (4) blink::ScriptLoader::PrepareScript
1.666 s : │ │ │ │ (4) blink::PendingScript::ExecuteScriptBlock
1.665 s : │ │ │ │ (4) blink::PendingScript::ExecuteScriptBlockInternal
1.665 s : │ │ │ │ (4) blink::ClassicScript::RunScript
1.665 s : │ │ │ │ (4) blink::ScriptController::ExecuteScriptInMainWorld
1.665 s : │ │ │ │ (4) blink::ScriptController::EvaluateScriptInMainWorld
1.665 s : │ │ │ │ (4) blink::ScriptController::ExecuteScriptAndReturnValue
135.282 ms : │ │ │ │ ├▶(2) blink::V8ScriptRunner::CompileScript
: │ │ │ │ │
1.524 s : │ │ │ │ └─(4) blink::V8ScriptRunner::RunCompiledScript
1.524 s : │ │ │ │ (4) v8::Script::Run
1.524 s : │ │ │ │ (4) v8::internal::Execution::Call
1.524 s : │ │ │ │ (4) v8::internal::_GLOBAL__N_1::Invoke
721.268 ms : │ │ │ │ ├─(1) v8::internal::Runtime_GetProperty
721.267 ms : │ │ │ │ │ (1) v8::internal::Runtime::GetObjectProperty
721.264 ms : │ │ │ │ │ (1) v8::internal::Object::GetProperty
721.263 ms : │ │ │ │ │ (1) v8::internal::Object::GetPropertyWithAccessor
721.260 ms : │ │ │ │ │ (1) v8::internal::Builtins::InvokeApiFunction
721.260 ms : │ │ │ │ │ (1) v8::internal::_GLOBAL__N_1::HandleApiCallHelper
721.259 ms : │ │ │ │ │ (1) v8::internal::FunctionCallbackArguments::Call
721.258 ms : │ │ │ │ │ (1) blink::V8HTMLElement::OffsetWidthAttributeGetterCallback
721.257 ms : │ │ │ │ │ (1) blink::HTMLElement::offsetWidthForBinding
721.236 ms : │ │ │ │ │ (1) blink::Document::EnsurePaintLocationDataValidForNode
719.933 ms : │ │ │ │ │ (1) blink::Document::UpdateStyleAndLayout
31.066 ms : │ │ │ │ │ ├─(1) blink::Document::UpdateStyleAndLayoutTree
: │ │ │ │ │ │
688.864 ms : │ │ │ │ │ └─(1) blink::LocalFrameView::UpdateLayout
688.438 ms : │ │ │ │ │ (1) blink::LocalFrameView::PerformLayout
688.345 ms : │ │ │ │ │ (1) blink::LayoutView::UpdateLayout
688.341 ms : │ │ │ │ │ (1) blink::LayoutBlock::UpdateLayout
688.336 ms : │ │ │ │ │ (1) blink::LayoutView::UpdateBlockLayout
688.329 ms : │ │ │ │ │ (1) blink::LayoutBlockFlow::UpdateBlockLayout
148.730 ms : │ │ │ │ │ ├▶(1) blink::LayoutBlockFlow::LayoutChildren
: │ │ │ │ │ │
538.604 ms : │ │ │ │ │ └─(1) blink::LayoutBlock::LayoutPositionedObjects
538.603 ms : │ │ │ │ │ (1) blink::LayoutBlock::LayoutPositionedObject
538.600 ms : │ │ │ │ │ ▶(1) blink::LayoutBlock::UpdateLayout
: │ │ │ │ │
46.254 ms : │ │ │ │ ├▶(1) v8::internal::Runtime_LoadIC_Miss
: │ │ │ │ │
596.228 ms : │ │ │ │ └▶(1) v8::internal::Builtin_HandleApiCall
: │ │ │ │
69.122 ms : │ │ │ ├▶(1) blink::HTMLTreeBuilder::ConstructTree
: │ │ │ │
66.743 ms : │ │ │ └▶(1) blink::HTMLDocumentParser::PrepareToStopParsing
: │ │ │
2.390 s : │ │ └▶(6) base::internal::Invoker::RunOnce
: │ │
1.323 s : │ └▶(9) base::WaitableEvent::TimedWaitUntil
: │
37.208 s : └▶(6) base::_GLOBAL__N_1::ThreadFunc
7.4. GPU Process
TOTAL TIME : FUNCTION
439.557 ms : (1) chrome
283.375 ms : ├─(1) main
283.375 ms : │ (1) ChromeMain
282.174 ms : │ (1) headless::HeadlessShellMain
282.174 ms : │ (1) headless::HeadlessShellMain
282.169 ms : │ (1) headless::RunChildProcessIfNeeded
282.122 ms : │ (1) headless::_GLOBAL__N_1::RunContentMain
282.103 ms : │ (1) content::ContentMain
282.098 ms : │ (1) service_manager::Main
20.642 ms : │ ├▶(1) content::ContentServiceManagerMainDelegate::Initialize
: │ │
261.199 ms : │ └─(1) content::ContentServiceManagerMainDelegate::RunEmbedderProcess
261.199 ms : │ (1) content::ContentMainRunnerImpl::Run
261.064 ms : │ (1) content::RunOtherNamedProcessTypeMain
261.059 ms : │ (1) content::GpuMain
54.474 ms : │ ├─(1) gpu::GpuInit::InitializeAndStartSandbox
28.751 ms : │ │ ├─(1) gl::init::InitializeGLNoExtensionsOneOff
28.700 ms : │ │ │ (1) gl::init::_GLOBAL__N_1::InitializeGLOneOffHelper
28.691 ms : │ │ │ (1) gl::init::InitializeGLOneOffImplementation
13.796 ms : │ │ │ ├▶(1) gl::init::InitializeStaticGLBindings
: │ │ │ │
14.894 ms : │ │ │ └─(1) gl::init::InitializeGLOneOffPlatform
14.875 ms : │ │ │ (1) gl::GLSurfaceEGL::InitializeOneOff
14.209 ms : │ │ │ (1) gl::GLSurfaceEGL::InitializeOneOffCommon
10.358 ms : │ │ │ (1) gl::InitializeGLContext
10.357 ms : │ │ │ ▶(1) gl::GLContextEGL::Initialize
: │ │ │
24.909 ms : │ │ └▶(2) gpu::_GLOBAL__N_1::CollectGraphicsInfo
: │ │
200.349 ms : │ └─(1) base::RunLoop::Run
200.346 ms : │ (1) base::MessageLoopImpl::Run
200.346 ms : │ (1) base::MessagePumpDefault::Run
5.398 ms : │ ├▶(1) base::WaitableEvent::TimedWaitUntil
: │ │
28.873 ms : │ └─(2) base::WaitableEvent::Wait
28.872 ms : │ (2) base::WaitableEvent::TimedWaitUntil
28.835 ms : │ (2) pthread_cond_wait
28.812 ms : │ (2) linux:schedule
: │
156.181 ms : └▶(3) base::_GLOBAL__N_1::ThreadFunc
8. Visualized trace output of chrome
- chrome: https://uftrace.github.io/dump/chrome.html
- flame-graph: https://uftrace.github.io/dump/chrome.svg
