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// btree_stats.h
/**
* Copyright (C) 2008-2012 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.
*/
#pragma once
#include "mongo/db/commands/server_status.h"
#include "mongo/db/pdfile.h"
#include "mongo/db/storage/record.h"
#include "mongo/util/processinfo.h"
namespace mongo {
class IndexCounters : public ServerStatusSection {
public:
IndexCounters();
virtual ~IndexCounters();
virtual bool includeByDefault() const { return true; }
virtual BSONObj generateSection(const BSONElement& configElement) const;
// used without a mutex intentionally (can race)
void btree( const char* node ) {
if ( ! _memSupported )
return;
btree( Record::likelyInPhysicalMemory( node ) );
}
void btree( bool memHit ) {
if ( memHit )
_btreeMemHits++;
else
_btreeMemMisses++;
if ( _btreeAccesses++ > _maxAllowed )
_roll();
}
void btreeHit() { _btreeMemHits++; _btreeAccesses++; }
void btreeMiss() { _btreeMemMisses++; _btreeAccesses++; }
private:
void _roll();
bool _memSupported;
int _resets;
long long _maxAllowed;
long long _btreeMemMisses;
long long _btreeMemHits;
long long _btreeAccesses;
};
extern IndexCounters* globalIndexCounters;
}
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