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// @file cpuprofile.cpp
/**
* Copyright (C) 2012 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
/**
* This module provides commands for starting and stopping the Google perftools
* cpu profiler linked into mongod.
*
* The following command enables the not-currently-enabled profiler, and writes
* the profile data to the specified "profileFilename."
* { _cpuProfilerStart: { profileFilename: '/path/on/mongod-host.prof' } }
*
* The following command disables the already-enabled profiler:
* { _cpuProfilerStop: 1}
*
* The commands defined here, and profiling, are only available when enabled at
* build-time with the "--use-cpu-profiler" argument to scons.
*
* Example SCons command line:
*
* scons --release --use-cpu-profiler
*/
#include "gperftools/profiler.h"
#include <string>
#include <vector>
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/jsobj.h"
namespace mongo {
namespace {
/**
* Common code for the implementation of cpu profiler commands.
*/
class CpuProfilerCommand : public Command {
public:
CpuProfilerCommand(char const* name) : Command(name) {}
virtual bool slaveOk() const {
return true;
}
virtual bool adminOnly() const {
return true;
}
virtual bool localHostOnlyIfNoAuth(const BSONObj& cmdObj) {
return true;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::cpuProfiler);
out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
}
// This is an abuse of the global dbmutex. We only really need to
// ensure that only one cpuprofiler command runs at once; it would
// be fine for it to run concurrently with other operations.
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
};
/**
* Class providing implementation of the _cpuProfilerStart command.
*/
class CpuProfilerStartCommand : public CpuProfilerCommand {
public:
CpuProfilerStartCommand() : CpuProfilerCommand(commandName) {}
virtual bool run(OperationContext* txn,
std::string const& db,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result);
static char const* const commandName;
} cpuProfilerStartCommandInstance;
/**
* Class providing implementation of the _cpuProfilerStop command.
*/
class CpuProfilerStopCommand : public CpuProfilerCommand {
public:
CpuProfilerStopCommand() : CpuProfilerCommand(commandName) {}
virtual bool run(OperationContext* txn,
std::string const& db,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result);
static char const* const commandName;
} cpuProfilerStopCommandInstance;
char const* const CpuProfilerStartCommand::commandName = "_cpuProfilerStart";
char const* const CpuProfilerStopCommand::commandName = "_cpuProfilerStop";
bool CpuProfilerStartCommand::run(OperationContext* txn,
std::string const& db,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result) {
// The DB lock here is just so we have IX on the global lock in order to prevent shutdown
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dbXLock(txn->lockState(), db, MODE_X);
OldClientContext ctx(txn, db, false /* no shard version checking */);
std::string profileFilename = cmdObj[commandName]["profileFilename"].String();
if (!::ProfilerStart(profileFilename.c_str())) {
errmsg = "Failed to start profiler";
return false;
}
return true;
}
bool CpuProfilerStopCommand::run(OperationContext* txn,
std::string const& db,
BSONObj& cmdObj,
int options,
std::string& errmsg,
BSONObjBuilder& result) {
// The DB lock here is just so we have IX on the global lock in order to prevent shutdown
ScopedTransaction transaction(txn, MODE_IX);
Lock::DBLock dbXLock(txn->lockState(), db, MODE_X);
OldClientContext ctx(txn, db, false /* no shard version checking */);
::ProfilerStop();
return true;
}
} // namespace
} // namespace mongo
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