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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "sql/database_memory_dump_provider.h"
#include <inttypes.h>
#include <ostream> // Needed to compile NOTREACHED() with operator <<.
#include <string>
#include "base/strings/stringprintf.h"
#include "base/synchronization/lock.h"
#include "base/trace_event/memory_dump_request_args.h"
#include "base/trace_event/process_memory_dump.h"
#include "sql/sqlite_result_code.h"
#include "sql/sqlite_result_code_values.h"
#include "third_party/sqlite/sqlite3.h"
namespace sql {
DatabaseMemoryDumpProvider::DatabaseMemoryDumpProvider(sqlite3* db,
const std::string& name)
: db_(db), connection_name_(name) {}
DatabaseMemoryDumpProvider::~DatabaseMemoryDumpProvider() = default;
void DatabaseMemoryDumpProvider::ResetDatabase() {
base::AutoLock lock(lock_);
db_ = nullptr;
}
bool DatabaseMemoryDumpProvider::OnMemoryDump(
const base::trace_event::MemoryDumpArgs& args,
base::trace_event::ProcessMemoryDump* pmd) {
if (args.level_of_detail ==
base::trace_event::MemoryDumpLevelOfDetail::kLight) {
return true;
}
MemoryUsageResult memory_usage = GetDbMemoryUsage();
if (!memory_usage.is_valid)
return false;
base::trace_event::MemoryAllocatorDump* dump =
pmd->CreateAllocatorDump(FormatDumpName());
dump->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
memory_usage.cache_size + memory_usage.schema_size +
memory_usage.statement_size);
dump->AddScalar("cache_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
memory_usage.cache_size);
dump->AddScalar("schema_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
memory_usage.schema_size);
dump->AddScalar("statement_size",
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
memory_usage.statement_size);
return true;
}
bool DatabaseMemoryDumpProvider::ReportMemoryUsage(
base::trace_event::ProcessMemoryDump* pmd,
const std::string& dump_name) {
MemoryUsageResult memory_usage = GetDbMemoryUsage();
if (!memory_usage.is_valid)
return false;
auto* mad = pmd->CreateAllocatorDump(dump_name);
mad->AddScalar(base::trace_event::MemoryAllocatorDump::kNameSize,
base::trace_event::MemoryAllocatorDump::kUnitsBytes,
memory_usage.cache_size + memory_usage.schema_size +
memory_usage.statement_size);
pmd->AddSuballocation(mad->guid(), FormatDumpName());
return true;
}
DatabaseMemoryDumpProvider::MemoryUsageResult
DatabaseMemoryDumpProvider::GetDbMemoryUsage() {
MemoryUsageResult result;
// Lock is acquired here so that db_ is not reset in ResetDatabase when
// collecting stats.
base::AutoLock lock(lock_);
if (!db_) {
DCHECK_EQ(result.is_valid, false);
return result;
}
// The following calls all set the high watermark to zero.
// See /https://www.sqlite.org/c3ref/c_dbstatus_options.html
int high_watermark = 0;
auto sqlite_result_code = ToSqliteResultCode(sqlite3_db_status(
db_, SQLITE_DBSTATUS_CACHE_USED, &result.cache_size, &high_watermark,
/*resetFlg=*/0));
DCHECK_EQ(sqlite_result_code, SqliteResultCode::kOk)
<< "sqlite3_db_status(SQLITE_DBSTATUS_CACHE_USED) failed";
#if DCHECK_IS_ON()
int shared_cache_size = 0;
sqlite_result_code = ToSqliteResultCode(
sqlite3_db_status(db_, SQLITE_DBSTATUS_CACHE_USED_SHARED,
&shared_cache_size, &high_watermark, /*resetFlg=*/0));
DCHECK_EQ(sqlite_result_code, SqliteResultCode::kOk)
<< "sqlite3_db_status(SQLITE_DBSTATUS_CACHE_USED_SHARED) failed";
DCHECK_EQ(shared_cache_size, result.cache_size)
<< "Memory counting assumes that each database uses a private page cache";
#endif // DCHECK_IS_ON()
sqlite_result_code = ToSqliteResultCode(sqlite3_db_status(
db_, SQLITE_DBSTATUS_SCHEMA_USED, &result.schema_size, &high_watermark,
/*resetFlg=*/0));
DCHECK_EQ(sqlite_result_code, SqliteResultCode::kOk)
<< "sqlite3_db_status(SQLITE_DBSTATUS_SCHEMA_USED) failed";
sqlite_result_code = ToSqliteResultCode(sqlite3_db_status(
db_, SQLITE_DBSTATUS_STMT_USED, &result.statement_size, &high_watermark,
/*resetFlg=*/0));
DCHECK_EQ(sqlite_result_code, SqliteResultCode::kOk)
<< "sqlite3_db_status(SQLITE_DBSTATUS_STMT_USED) failed";
result.is_valid = true;
return result;
}
std::string DatabaseMemoryDumpProvider::FormatDumpName() const {
return base::StringPrintf(
"sqlite/%s_connection/0x%" PRIXPTR,
connection_name_.empty() ? "Unknown" : connection_name_.c_str(),
reinterpret_cast<uintptr_t>(this));
}
} // namespace sql
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