diff options
Diffstat (limited to 'llvm/tools/llvm-profdata/llvm-profdata.cpp')
| -rw-r--r-- | llvm/tools/llvm-profdata/llvm-profdata.cpp | 43 |
1 files changed, 40 insertions, 3 deletions
diff --git a/llvm/tools/llvm-profdata/llvm-profdata.cpp b/llvm/tools/llvm-profdata/llvm-profdata.cpp index 693af06..28c3afa 100644 --- a/llvm/tools/llvm-profdata/llvm-profdata.cpp +++ b/llvm/tools/llvm-profdata/llvm-profdata.cpp @@ -340,7 +340,7 @@ cl::opt<unsigned long long> OverlapValueCutoff( "profile with max count value greater then the parameter value"), cl::sub(OverlapSubcommand)); -// Options unique to show subcommand. +// Options specific to show subcommand. cl::opt<bool> ShowCounts("counts", cl::init(false), cl::desc("Show counter values for shown functions"), cl::sub(ShowSubcommand)); @@ -439,6 +439,14 @@ cl::opt<bool> ShowProfileVersion("profile-version", cl::init(false), cl::desc("Show profile version. "), cl::sub(ShowSubcommand)); +// Options specific to order subcommand. +cl::opt<unsigned> + NumTestTraces("num-test-traces", cl::init(0), + cl::desc("Keep aside the last <num-test-traces> traces in " + "the profile when computing the function order and " + "instead use them to evaluate that order"), + cl::sub(OrderSubcommand)); + // We use this string to indicate that there are // multiple static functions map to the same name. const std::string DuplicateNameStr = "----"; @@ -3277,13 +3285,42 @@ static int order_main() { // Read all entries (void)I; } - auto &Traces = Reader->getTemporalProfTraces(); - auto Nodes = TemporalProfTraceTy::createBPFunctionNodes(Traces); + ArrayRef Traces = Reader->getTemporalProfTraces(); + if (NumTestTraces && NumTestTraces >= Traces.size()) + exitWithError( + "--" + NumTestTraces.ArgStr + + " must be smaller than the total number of traces: expected: < " + + Twine(Traces.size()) + ", actual: " + Twine(NumTestTraces)); + ArrayRef TestTraces = Traces.take_back(NumTestTraces); + Traces = Traces.drop_back(NumTestTraces); + + std::vector<BPFunctionNode> Nodes; + TemporalProfTraceTy::createBPFunctionNodes(Traces, Nodes); BalancedPartitioningConfig Config; BalancedPartitioning BP(Config); BP.run(Nodes); OS << "# Ordered " << Nodes.size() << " functions\n"; + if (!TestTraces.empty()) { + // Since we don't know the symbol sizes, we assume 32 functions per page. + DenseMap<BPFunctionNode::IDT, unsigned> IdToPageNumber; + for (auto &Node : Nodes) + IdToPageNumber[Node.Id] = IdToPageNumber.size() / 32; + + SmallSet<unsigned, 0> TouchedPages; + unsigned Area = 0; + for (auto &Trace : TestTraces) { + for (auto Id : Trace.FunctionNameRefs) { + auto It = IdToPageNumber.find(Id); + if (It == IdToPageNumber.end()) + continue; + TouchedPages.insert(It->getSecond()); + Area += TouchedPages.size(); + } + TouchedPages.clear(); + } + OS << "# Total area under the page fault curve: " << (float)Area << "\n"; + } OS << "# Warning: Mach-O may prefix symbols with \"_\" depending on the " "linkage and this output does not take that into account. Some " "post-processing may be required before passing to the linker via " |