llvm-project/lldb/source/Target/Statistics.cpp
Ziyi Wang 55e3b6d921
[lldb] Add count for errors of DWO files in statistics and combine DWO file count functions (#155023)
## Summary
A new `totalDwoErrorCount` counter is available in statistics when
calling `statistics dump` to track the number of DWO errors.
Additionally, this PR refactors the DWO file statistics by consolidating
the existing functionality for counting loaded and total DWO files
together with the number of DWO errors into a single function that
returns a new DWOStats struct.

1. A new struct, `DWOStats` is created to hold the number of loaded DWO
files, the total number of DWO files and the number of DWO errors.
2. Replaced the previous `GetDwoFileCounts` function for loaded and
total DWO file counts with a single `GetDwoStats()` function returning
the struct `DWOStats`. An override is implemented for `SymbolFileDWARF`
that computes the new DWO error count alongside existing counts in one
pass. If the status of a DWO CU is `Fail`, which means there is error
happened during the loading process, we increment the DWO error counter.
_Note: The newly created function `GetDwoStats` will only be called when
we try to get statistics. Other codepaths will not be affected._
3. In Statistics, we sum up the total number of DWO file loading errors.
This is done by getting `DWOStats` for each symbol file and adding up
the results for each module, then adding to the total count among all
modules.
4. In Statistics, we also updated call sites to use the new combined
function and struct for loaded and total DWO file counts. As it is
possible for one module to have several symbol files, the DWO file
counts in a module's stats are updated to be calculated by adding up the
counts from all symbol files.

## Expected Behavior

- When binaries are compiled with split-dwarf and separate DWO files,
`totalDwoLoadErrorCount` would be the number of dwo files with error
occurs during the loading process, 0 if no error occurs during a loading
process.

- When not using split-dwarf, we expect `totalDwoLoadErrorCount` to be 0
since there no DWO file loading errors would be caused.

- `totalLoadedDwoFileCount` and `totalDwoFileCount` should be correctly
calculated after refactoring and updating.

## Testing
### Manual Testing
We created some files to simulate the possible DWO errors manually and
observed the results generated by statistics dump.
For example, if we delete one of the DWO files generated after
compiling, we would get:
```
(lldb) statistics dump
{
  ...
  "totalDwoLoadErrorCount": 1,
  ...
}
```
We also checked the time cost of `statistics dump` w/o the modification
to make sure no significant time cost increase imported.

### Unit test
Added two unit tests that build with new "dwo_error_foo.cpp" and
"dwo_error_main.cpp" files. For tests with flags -gsplit-dwarf, this
generates 2 DWO files.
In one of the tests, we delete both DWO files and check the result to
see if it reflects the number of DWO files with errors correctly. In
another test we update one of the files but loading the outdated .dwo
file of it, expecting it increments the error count by 1.
To run the test:
```
$ bin/lldb-dotest -p TestStats.py ~/local/llvm-project/lldb/test/API/commands/statistics/basic/ -G "dwo"
----------------------------------------------------------------------
Ran 27 tests in 2.680s

OK (skipped=21)

$ bin/lldb-dotest -p TestStats.py ~/local/llvm-project/lldb/test/API/commands/statistics/basic/
----------------------------------------------------------------------
Ran 27 tests in 370.131s

OK (skipped=3)
```
2025-09-03 14:41:42 -07:00

533 lines
22 KiB
C++

//===-- Statistics.cpp ----------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Target/Statistics.h"
#include "lldb/Core/Debugger.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/PluginManager.h"
#include "lldb/Interpreter/CommandInterpreter.h"
#include "lldb/Symbol/SymbolFile.h"
#include "lldb/Target/DynamicLoader.h"
#include "lldb/Target/Process.h"
#include "lldb/Target/Target.h"
#include "lldb/Target/UnixSignals.h"
#include "lldb/Utility/StructuredData.h"
using namespace lldb;
using namespace lldb_private;
using namespace llvm;
static void EmplaceSafeString(llvm::json::Object &obj, llvm::StringRef key,
const std::string &str) {
if (str.empty())
return;
if (LLVM_LIKELY(llvm::json::isUTF8(str)))
obj.try_emplace(key, str);
else
obj.try_emplace(key, llvm::json::fixUTF8(str));
}
json::Value StatsSuccessFail::ToJSON() const {
return json::Object{{"successes", successes}, {"failures", failures}};
}
static double elapsed(const StatsTimepoint &start, const StatsTimepoint &end) {
StatsDuration::Duration elapsed =
end.time_since_epoch() - start.time_since_epoch();
return elapsed.count();
}
void TargetStats::CollectStats(Target &target) {
m_module_identifiers.clear();
for (ModuleSP module_sp : target.GetImages().Modules())
m_module_identifiers.emplace_back((intptr_t)module_sp.get());
}
json::Value ModuleStats::ToJSON() const {
json::Object module;
EmplaceSafeString(module, "path", path);
EmplaceSafeString(module, "uuid", uuid);
EmplaceSafeString(module, "triple", triple);
module.try_emplace("identifier", identifier);
module.try_emplace("symbolTableParseTime", symtab_parse_time);
module.try_emplace("symbolTableIndexTime", symtab_index_time);
module.try_emplace("symbolTableLoadedFromCache", symtab_loaded_from_cache);
module.try_emplace("symbolTableSavedToCache", symtab_saved_to_cache);
module.try_emplace("debugInfoParseTime", debug_parse_time);
module.try_emplace("debugInfoIndexTime", debug_index_time);
module.try_emplace("debugInfoByteSize", (int64_t)debug_info_size);
module.try_emplace("debugInfoIndexLoadedFromCache",
debug_info_index_loaded_from_cache);
module.try_emplace("debugInfoIndexSavedToCache",
debug_info_index_saved_to_cache);
module.try_emplace("debugInfoEnabled", debug_info_enabled);
module.try_emplace("debugInfoHadVariableErrors",
debug_info_had_variable_errors);
module.try_emplace("debugInfoHadIncompleteTypes",
debug_info_had_incomplete_types);
module.try_emplace("symbolTableStripped", symtab_stripped);
module.try_emplace("symbolTableSymbolCount", symtab_symbol_count);
module.try_emplace("dwoFileCount", dwo_stats.dwo_file_count);
module.try_emplace("loadedDwoFileCount", dwo_stats.loaded_dwo_file_count);
module.try_emplace("dwoErrorCount", dwo_stats.dwo_error_count);
if (!symbol_locator_time.map.empty()) {
json::Object obj;
for (const auto &entry : symbol_locator_time.map)
obj.try_emplace(entry.first().str(), entry.second);
module.try_emplace("symbolLocatorTime", std::move(obj));
}
if (!symfile_path.empty())
module.try_emplace("symbolFilePath", symfile_path);
if (!symfile_modules.empty()) {
json::Array symfile_ids;
for (const auto symfile_id : symfile_modules)
symfile_ids.emplace_back(symfile_id);
module.try_emplace("symbolFileModuleIdentifiers", std::move(symfile_ids));
}
if (!type_system_stats.empty()) {
json::Array type_systems;
for (const auto &entry : type_system_stats) {
json::Object obj;
obj.try_emplace(entry.first().str(), entry.second);
type_systems.emplace_back(std::move(obj));
}
module.try_emplace("typeSystemInfo", std::move(type_systems));
}
return module;
}
llvm::json::Value ConstStringStats::ToJSON() const {
json::Object obj;
obj.try_emplace<int64_t>("bytesTotal", stats.GetBytesTotal());
obj.try_emplace<int64_t>("bytesUsed", stats.GetBytesUsed());
obj.try_emplace<int64_t>("bytesUnused", stats.GetBytesUnused());
return obj;
}
json::Value
TargetStats::ToJSON(Target &target,
const lldb_private::StatisticsOptions &options) {
json::Object target_metrics_json;
ProcessSP process_sp = target.GetProcessSP();
const bool summary_only = options.GetSummaryOnly();
const bool include_modules = options.GetIncludeModules();
if (!summary_only) {
CollectStats(target);
json::Array json_module_uuid_array;
for (auto module_identifier : m_module_identifiers)
json_module_uuid_array.emplace_back(module_identifier);
target_metrics_json.try_emplace(m_expr_eval.name, m_expr_eval.ToJSON());
target_metrics_json.try_emplace(m_frame_var.name, m_frame_var.ToJSON());
if (include_modules)
target_metrics_json.try_emplace("moduleIdentifiers",
std::move(json_module_uuid_array));
if (m_launch_or_attach_time && m_first_private_stop_time) {
double elapsed_time =
elapsed(*m_launch_or_attach_time, *m_first_private_stop_time);
target_metrics_json.try_emplace("launchOrAttachTime", elapsed_time);
}
if (m_launch_or_attach_time && m_first_public_stop_time) {
double elapsed_time =
elapsed(*m_launch_or_attach_time, *m_first_public_stop_time);
target_metrics_json.try_emplace("firstStopTime", elapsed_time);
}
target_metrics_json.try_emplace("targetCreateTime",
m_create_time.get().count());
json::Array breakpoints_array;
double totalBreakpointResolveTime = 0.0;
// Report both the normal breakpoint list and the internal breakpoint list.
for (int i = 0; i < 2; ++i) {
BreakpointList &breakpoints = target.GetBreakpointList(i == 1);
std::unique_lock<std::recursive_mutex> lock;
breakpoints.GetListMutex(lock);
size_t num_breakpoints = breakpoints.GetSize();
for (size_t i = 0; i < num_breakpoints; i++) {
Breakpoint *bp = breakpoints.GetBreakpointAtIndex(i).get();
breakpoints_array.push_back(bp->GetStatistics());
totalBreakpointResolveTime += bp->GetResolveTime().count();
}
}
target_metrics_json.try_emplace("breakpoints",
std::move(breakpoints_array));
target_metrics_json.try_emplace("totalBreakpointResolveTime",
totalBreakpointResolveTime);
if (process_sp) {
UnixSignalsSP unix_signals_sp = process_sp->GetUnixSignals();
if (unix_signals_sp)
target_metrics_json.try_emplace(
"signals", unix_signals_sp->GetHitCountStatistics());
}
}
// Counting "totalSharedLibraryEventHitCount" from breakpoints of kind
// "shared-library-event".
{
uint32_t shared_library_event_breakpoint_hit_count = 0;
// The "shared-library-event" is only found in the internal breakpoint list.
BreakpointList &breakpoints = target.GetBreakpointList(/* internal */ true);
std::unique_lock<std::recursive_mutex> lock;
breakpoints.GetListMutex(lock);
size_t num_breakpoints = breakpoints.GetSize();
for (size_t i = 0; i < num_breakpoints; i++) {
Breakpoint *bp = breakpoints.GetBreakpointAtIndex(i).get();
if (strcmp(bp->GetBreakpointKind(), "shared-library-event") == 0)
shared_library_event_breakpoint_hit_count += bp->GetHitCount();
}
target_metrics_json.try_emplace("totalSharedLibraryEventHitCount",
shared_library_event_breakpoint_hit_count);
}
if (process_sp) {
uint32_t stop_id = process_sp->GetStopID();
target_metrics_json.try_emplace("stopCount", stop_id);
llvm::StringRef dyld_plugin_name;
if (process_sp->GetDynamicLoader())
dyld_plugin_name = process_sp->GetDynamicLoader()->GetPluginName();
target_metrics_json.try_emplace("dyldPluginName", dyld_plugin_name);
}
target_metrics_json.try_emplace("sourceMapDeduceCount",
m_source_map_deduce_count);
target_metrics_json.try_emplace("sourceRealpathAttemptCount",
m_source_realpath_attempt_count);
target_metrics_json.try_emplace("sourceRealpathCompatibleCount",
m_source_realpath_compatible_count);
target_metrics_json.try_emplace("summaryProviderStatistics",
target.GetSummaryStatisticsCache().ToJSON());
return target_metrics_json;
}
void TargetStats::Reset(Target &target) {
m_launch_or_attach_time.reset();
m_first_private_stop_time.reset();
m_first_public_stop_time.reset();
// Report both the normal breakpoint list and the internal breakpoint list.
for (int i = 0; i < 2; ++i) {
BreakpointList &breakpoints = target.GetBreakpointList(i == 1);
std::unique_lock<std::recursive_mutex> lock;
breakpoints.GetListMutex(lock);
size_t num_breakpoints = breakpoints.GetSize();
for (size_t i = 0; i < num_breakpoints; i++) {
Breakpoint *bp = breakpoints.GetBreakpointAtIndex(i).get();
bp->ResetStatistics();
}
}
target.GetSummaryStatisticsCache().Reset();
}
void TargetStats::SetLaunchOrAttachTime() {
m_launch_or_attach_time = StatsClock::now();
m_first_private_stop_time = std::nullopt;
}
void TargetStats::SetFirstPrivateStopTime() {
// Launching and attaching has many paths depending on if synchronous mode
// was used or if we are stopping at the entry point or not. Only set the
// first stop time if it hasn't already been set.
if (!m_first_private_stop_time)
m_first_private_stop_time = StatsClock::now();
}
void TargetStats::SetFirstPublicStopTime() {
// Launching and attaching has many paths depending on if synchronous mode
// was used or if we are stopping at the entry point or not. Only set the
// first stop time if it hasn't already been set.
if (!m_first_public_stop_time)
m_first_public_stop_time = StatsClock::now();
}
void TargetStats::IncreaseSourceMapDeduceCount() {
++m_source_map_deduce_count;
}
void TargetStats::IncreaseSourceRealpathAttemptCount(uint32_t count) {
m_source_realpath_attempt_count += count;
}
void TargetStats::IncreaseSourceRealpathCompatibleCount(uint32_t count) {
m_source_realpath_compatible_count += count;
}
bool DebuggerStats::g_collecting_stats = false;
void DebuggerStats::ResetStatistics(Debugger &debugger, Target *target) {
std::lock_guard<std::recursive_mutex> guard(
Module::GetAllocationModuleCollectionMutex());
const uint64_t num_modules = target != nullptr
? target->GetImages().GetSize()
: Module::GetNumberAllocatedModules();
for (size_t image_idx = 0; image_idx < num_modules; ++image_idx) {
Module *module = target != nullptr
? target->GetImages().GetModuleAtIndex(image_idx).get()
: Module::GetAllocatedModuleAtIndex(image_idx);
if (module == nullptr)
continue;
module->ResetStatistics();
}
if (target)
target->ResetStatistics();
else {
for (const auto &target : debugger.GetTargetList().Targets())
target->ResetStatistics();
}
}
llvm::json::Value DebuggerStats::ReportStatistics(
Debugger &debugger, Target *target,
const lldb_private::StatisticsOptions &options) {
const bool summary_only = options.GetSummaryOnly();
const bool load_all_debug_info = options.GetLoadAllDebugInfo();
const bool include_targets = options.GetIncludeTargets();
const bool include_modules = options.GetIncludeModules();
const bool include_transcript = options.GetIncludeTranscript();
const bool include_plugins = options.GetIncludePlugins();
json::Array json_targets;
json::Array json_modules;
StatisticsMap symbol_locator_total_time;
double symtab_parse_time = 0.0;
double symtab_index_time = 0.0;
double debug_parse_time = 0.0;
double debug_index_time = 0.0;
uint32_t symtabs_loaded = 0;
uint32_t symtabs_loaded_from_cache = 0;
uint32_t symtabs_saved_to_cache = 0;
uint32_t debug_index_loaded = 0;
uint32_t debug_index_saved = 0;
uint64_t debug_info_size = 0;
std::lock_guard<std::recursive_mutex> guard(
Module::GetAllocationModuleCollectionMutex());
const uint64_t num_modules = target != nullptr
? target->GetImages().GetSize()
: Module::GetNumberAllocatedModules();
uint32_t num_debug_info_enabled_modules = 0;
uint32_t num_modules_has_debug_info = 0;
uint32_t num_modules_with_variable_errors = 0;
uint32_t num_modules_with_incomplete_types = 0;
uint32_t num_stripped_modules = 0;
uint32_t symtab_symbol_count = 0;
DWOStats total_dwo_stats;
for (size_t image_idx = 0; image_idx < num_modules; ++image_idx) {
Module *module = target != nullptr
? target->GetImages().GetModuleAtIndex(image_idx).get()
: Module::GetAllocatedModuleAtIndex(image_idx);
ModuleStats module_stat;
module_stat.symtab_parse_time = module->GetSymtabParseTime().get().count();
module_stat.symtab_index_time = module->GetSymtabIndexTime().get().count();
module_stat.symbol_locator_time = module->GetSymbolLocatorStatistics();
symbol_locator_total_time.merge(module_stat.symbol_locator_time);
Symtab *symtab = module->GetSymtab(/*can_create=*/false);
if (symtab) {
module_stat.symtab_symbol_count = symtab->GetNumSymbols();
symtab_symbol_count += module_stat.symtab_symbol_count;
++symtabs_loaded;
module_stat.symtab_loaded_from_cache = symtab->GetWasLoadedFromCache();
if (module_stat.symtab_loaded_from_cache)
++symtabs_loaded_from_cache;
module_stat.symtab_saved_to_cache = symtab->GetWasSavedToCache();
if (module_stat.symtab_saved_to_cache)
++symtabs_saved_to_cache;
}
SymbolFile *sym_file = module->GetSymbolFile(/*can_create=*/false);
if (sym_file) {
if (!summary_only) {
if (sym_file->GetObjectFile() != module->GetObjectFile())
module_stat.symfile_path =
sym_file->GetObjectFile()->GetFileSpec().GetPath();
ModuleList symbol_modules = sym_file->GetDebugInfoModules();
for (const auto &symbol_module : symbol_modules.Modules())
module_stat.symfile_modules.push_back((intptr_t)symbol_module.get());
}
DWOStats current_dwo_stats = sym_file->GetDwoStats();
module_stat.dwo_stats = module_stat.dwo_stats + current_dwo_stats;
total_dwo_stats = total_dwo_stats + current_dwo_stats;
module_stat.debug_info_index_loaded_from_cache =
sym_file->GetDebugInfoIndexWasLoadedFromCache();
if (module_stat.debug_info_index_loaded_from_cache)
++debug_index_loaded;
module_stat.debug_info_index_saved_to_cache =
sym_file->GetDebugInfoIndexWasSavedToCache();
if (module_stat.debug_info_index_saved_to_cache)
++debug_index_saved;
module_stat.debug_index_time = sym_file->GetDebugInfoIndexTime().count();
module_stat.debug_parse_time = sym_file->GetDebugInfoParseTime().count();
module_stat.debug_info_size =
sym_file->GetDebugInfoSize(load_all_debug_info);
module_stat.symtab_stripped = module->GetObjectFile()->IsStripped();
if (module_stat.symtab_stripped)
++num_stripped_modules;
module_stat.debug_info_enabled = sym_file->GetLoadDebugInfoEnabled() &&
module_stat.debug_info_size > 0;
module_stat.debug_info_had_variable_errors =
sym_file->GetDebugInfoHadFrameVariableErrors();
if (module_stat.debug_info_enabled)
++num_debug_info_enabled_modules;
if (module_stat.debug_info_size > 0)
++num_modules_has_debug_info;
if (module_stat.debug_info_had_variable_errors)
++num_modules_with_variable_errors;
}
symtab_parse_time += module_stat.symtab_parse_time;
symtab_index_time += module_stat.symtab_index_time;
debug_parse_time += module_stat.debug_parse_time;
debug_index_time += module_stat.debug_index_time;
debug_info_size += module_stat.debug_info_size;
module->ForEachTypeSystem([&](lldb::TypeSystemSP ts) {
if (auto stats = ts->ReportStatistics())
module_stat.type_system_stats.insert({ts->GetPluginName(), *stats});
if (ts->GetHasForcefullyCompletedTypes())
module_stat.debug_info_had_incomplete_types = true;
return true;
});
if (module_stat.debug_info_had_incomplete_types)
++num_modules_with_incomplete_types;
if (include_modules) {
module_stat.identifier = (intptr_t)module;
module_stat.path = module->GetFileSpec().GetPath();
if (ConstString object_name = module->GetObjectName()) {
module_stat.path.append(1, '(');
module_stat.path.append(object_name.GetStringRef().str());
module_stat.path.append(1, ')');
}
module_stat.uuid = module->GetUUID().GetAsString();
module_stat.triple = module->GetArchitecture().GetTriple().str();
json_modules.emplace_back(module_stat.ToJSON());
}
}
json::Object global_stats{
{"totalSymbolTableParseTime", symtab_parse_time},
{"totalSymbolTableIndexTime", symtab_index_time},
{"totalSymbolTablesLoaded", symtabs_loaded},
{"totalSymbolTablesLoadedFromCache", symtabs_loaded_from_cache},
{"totalSymbolTablesSavedToCache", symtabs_saved_to_cache},
{"totalDebugInfoParseTime", debug_parse_time},
{"totalDebugInfoIndexTime", debug_index_time},
{"totalDebugInfoIndexLoadedFromCache", debug_index_loaded},
{"totalDebugInfoIndexSavedToCache", debug_index_saved},
{"totalDebugInfoByteSize", debug_info_size},
{"totalModuleCount", num_modules},
{"totalModuleCountHasDebugInfo", num_modules_has_debug_info},
{"totalModuleCountWithVariableErrors", num_modules_with_variable_errors},
{"totalModuleCountWithIncompleteTypes",
num_modules_with_incomplete_types},
{"totalDebugInfoEnabled", num_debug_info_enabled_modules},
{"totalSymbolTableStripped", num_stripped_modules},
{"totalSymbolTableSymbolCount", symtab_symbol_count},
{"totalLoadedDwoFileCount", total_dwo_stats.loaded_dwo_file_count},
{"totalDwoFileCount", total_dwo_stats.dwo_file_count},
{"totalDwoErrorCount", total_dwo_stats.dwo_error_count},
};
if (include_targets) {
if (target) {
json_targets.emplace_back(target->ReportStatistics(options));
} else {
for (const auto &target : debugger.GetTargetList().Targets())
json_targets.emplace_back(target->ReportStatistics(options));
}
global_stats.try_emplace("targets", std::move(json_targets));
}
if (!symbol_locator_total_time.map.empty()) {
json::Object obj;
for (const auto &entry : symbol_locator_total_time.map)
obj.try_emplace(entry.first().str(), entry.second);
global_stats.try_emplace("totalSymbolLocatorTime", std::move(obj));
}
ConstStringStats const_string_stats;
json::Object json_memory{
{"strings", const_string_stats.ToJSON()},
};
global_stats.try_emplace("memory", std::move(json_memory));
if (!summary_only) {
json::Value cmd_stats = debugger.GetCommandInterpreter().GetStatistics();
global_stats.try_emplace("commands", std::move(cmd_stats));
}
if (include_modules) {
global_stats.try_emplace("modules", std::move(json_modules));
}
if (include_transcript) {
// When transcript is available, add it to the to-be-returned statistics.
//
// NOTE:
// When the statistics is polled by an LLDB command:
// - The transcript in the returned statistics *will NOT* contain the
// returned statistics itself (otherwise infinite recursion).
// - The returned statistics *will* be written to the internal transcript
// buffer. It *will* appear in the next statistcs or transcript poll.
//
// For example, let's say the following commands are run in order:
// - "version"
// - "statistics dump" <- call it "A"
// - "statistics dump" <- call it "B"
// The output of "A" will contain the transcript of "version" and
// "statistics dump" (A), with the latter having empty output. The output
// of B will contain the trascnript of "version", "statistics dump" (A),
// "statistics dump" (B), with A's output populated and B's output empty.
const StructuredData::Array &transcript =
debugger.GetCommandInterpreter().GetTranscript();
if (transcript.GetSize() != 0) {
std::string buffer;
llvm::raw_string_ostream ss(buffer);
json::OStream json_os(ss);
transcript.Serialize(json_os);
if (auto json_transcript = llvm::json::parse(buffer))
global_stats.try_emplace("transcript",
std::move(json_transcript.get()));
}
}
if (include_plugins) {
global_stats.try_emplace("plugins", PluginManager::GetJSON());
}
return std::move(global_stats);
}
llvm::json::Value SummaryStatistics::ToJSON() const {
return json::Object{{
{"name", GetName()},
{"type", GetSummaryKindName()},
{"count", GetSummaryCount()},
{"totalTime", GetTotalTime()},
}};
}
json::Value SummaryStatisticsCache::ToJSON() {
std::lock_guard<std::mutex> guard(m_map_mutex);
json::Array json_summary_stats;
for (const auto &summary_stat : m_summary_stats_map)
json_summary_stats.emplace_back(summary_stat.second->ToJSON());
return json_summary_stats;
}
void SummaryStatisticsCache::Reset() {
for (const auto &summary_stat : m_summary_stats_map)
summary_stat.second->Reset();
}