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[BOLT] Report per-section hotness in bolt-heatmap.

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This patch adds a new feature to bolt heatmap to print the hotness of each section in terms of the percentage of samples within that section.

Sample output generated for the clang binary:

Section Name, Begin Address, End Address, Percentage Hotness
.text, 0x1a7b9b0, 0x20a2cc0, 1.4709
.init, 0x20a2cc0, 0x20a2ce1, 0.0001
.fini, 0x20a2ce4, 0x20a2cf2, 0.0000
.text.unlikely, 0x20a2d00, 0x431990c, 0.3061
.text.hot, 0x4319910, 0x4bc6927, 97.2197
.text.startup, 0x4bc6930, 0x4c10c89, 0.0058
.plt, 0x4c10c90, 0x4c12010, 0.9974

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D124412
This commit is contained in:
Rahman Lavaee
2022-05-05 11:37:15 -07:00
parent f6dff93641
commit 733dc3e50b
3 changed files with 100 additions and 4 deletions
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22
bolt/lib/Profile/DataAggregator.cpp
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@@ -116,6 +116,22 @@ namespace {
const char TimerGroupName[] = "aggregator";
const char TimerGroupDesc[] = "Aggregator";
std::vector<SectionNameAndRange> getTextSections(const BinaryContext *BC) {
std::vector<SectionNameAndRange> sections;
for (BinarySection &Section : BC->sections()) {
if (!Section.isText())
continue;
if (Section.getSize() == 0)
continue;
sections.push_back(
{Section.getName(), Section.getAddress(), Section.getEndAddress()});
}
std::sort(sections.begin(), sections.end(),
[](const SectionNameAndRange &A, const SectionNameAndRange &B) {
return A.BeginAddress < B.BeginAddress;
});
return sections;
}
}
constexpr uint64_t DataAggregator::KernelBaseAddr;
@@ -1292,7 +1308,7 @@ std::error_code DataAggregator::printLBRHeatMap() {
opts::HeatmapMinAddress = KernelBaseAddr;
}
Heatmap HM(opts::HeatmapBlock, opts::HeatmapMinAddress,
opts::HeatmapMaxAddress);
opts::HeatmapMaxAddress, getTextSections(BC));
uint64_t NumTotalSamples = 0;
if (opts::BasicAggregation) {
@@ -1374,6 +1390,10 @@ std::error_code DataAggregator::printLBRHeatMap() {
HM.printCDF(opts::OutputFilename);
else
HM.printCDF(opts::OutputFilename + ".csv");
if (opts::OutputFilename == "-")
HM.printSectionHotness(opts::OutputFilename);
else
HM.printSectionHotness(opts::OutputFilename + "-section-hotness.csv");
return std::error_code();
}