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[XRay] cache symbolized function names for a repeatedly queried function ID

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Summary:
Processing 2 GB XRay traces with "llvm-xray convert -symbolize" needs to
go over each trace record and symbolize the function name refered to by
its ID.  Currently this happens by asking the LLVM symbolizer code every
single time.  A simple cache can save around 30 minutes of processing of
that trace.

llvm-xray's resident memory usage increased negligibly with this cache.

Reviewers: dberris

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D43896

llvm-svn: 326407
This commit is contained in:
Martin Pelikan 2018-03-01 01:59:24 +00:00
parent cb7b6e9d9f
commit ee48a509e2
2 changed files with 9 additions and 1 deletions
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8
tools/llvm-xray/func-id-helper.cc
View File

@ -19,6 +19,10 @@ using namespace llvm;
using namespace xray;
std::string FuncIdConversionHelper::SymbolOrNumber(int32_t FuncId) const {
auto CacheIt = CachedNames.find(FuncId);
if (CacheIt != CachedNames.end())
return CacheIt->second;
std::ostringstream F;
auto It = FunctionAddresses.find(FuncId);
if (It == FunctionAddresses.end()) {
@ -37,7 +41,9 @@ std::string FuncIdConversionHelper::SymbolOrNumber(int32_t FuncId) const {
F << "@(" << std::hex << It->second << ")";
});
return F.str();
auto S = F.str();
CachedNames[FuncId] = S;
return S;
}
std::string FuncIdConversionHelper::FileLineAndColumn(int32_t FuncId) const {

2
tools/llvm-xray/func-id-helper.h
View File

@ -13,6 +13,7 @@
#ifndef LLVM_TOOLS_LLVM_XRAY_FUNC_ID_HELPER_H
#define LLVM_TOOLS_LLVM_XRAY_FUNC_ID_HELPER_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/DebugInfo/Symbolize/Symbolize.h"
#include <unordered_map>
@ -28,6 +29,7 @@ private:
std::string BinaryInstrMap;
symbolize::LLVMSymbolizer &Symbolizer;
const FunctionAddressMap &FunctionAddresses;
mutable llvm::DenseMap<int32_t, std::string> CachedNames;
public:
FuncIdConversionHelper(std::string BinaryInstrMap,